Age | Commit message (Collapse) | Author | Files | Lines |
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If a block device driver cannot fetch all requests from the blocklayer
it's in his responsibility to call the request function at a later time.
Normally this would be done after the next irq for the underlying device
is handled. However in situations where we have no outstanding request
we have to schedule the request function for a later time.
This is determined using an internal counter of requests issued to the
hardware.
In some cases where we give a request back to the block layer unhandled
the number of queued requests was not adjusted. Fix this class of
failures by adjusting queued_requests in all functions used to give
a request back to the block layer.
Reviewed-by: Peter Oberparleiter <[email protected]>
Signed-off-by: Sebastian Ott <[email protected]>
Signed-off-by: Peter Oberparleiter <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
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It's compatible with ALC282.
Signed-off-by: Kailang Yang <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
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Move the zero check `hda_frame_size_words == 0' before the modulus
`buffer_size_words % hda_frame_size_words'.
Also remove the redundant null check `buffer_addx == NULL'.
Signed-off-by: Xi Wang <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
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If the new control cannot be created, this function will return to avoid
snd_hda_ctl_add dereferencing a NULL control pointer.
Signed-off-by: Mengdong Lin <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
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If the SPDIF control array cannot be reallocated, the function
will return to avoid dereferencing a NULL pointer.
Signed-off-by: Mengdong Lin <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus
ASoC: Updates for v3.9
A few driver fixes, none of them terribly dramatic.
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If the sentinel triggers, we do not want the boot loader authors to
just poke it and make the error go away, we want them to actually fix
the problem.
This should help avoid making the incorrect change in non-compliant
bootloaders.
[ hpa: dropped the Documentation/x86/boot.txt hunk pending
clarifications ]
Signed-off-by: Peter Jones <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: H. Peter Anvin <[email protected]>
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RetryCnt value in c67x00 TD should be 3 (both bits set to 1). Reference
Cypress Semiconductor BIOS User's Manual 1.2, page 3-14
Signed-off-by: Dave Tubbs <[email protected]>
Acked-by: Peter Korsgaard <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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TD data length is 10 bits, correct TD_PORTLENMASK_DL. Reference
Cypress Semiconductor BIOS User's Manual 1.2, page 3-10
Signed-off-by: Dave Tubbs <[email protected]>
Acked-by: Peter Korsgaard <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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drivers/usb/phy/ should be compiled everytime
we have CONFIG_USB_OTG_UTILS enabled.
phy/ should've been part of the build process based
on CONFIG_USB_OTG_UTILS, don't know where I had my head
when I allowed CONFIG_USB_COMMON there.
In fact commit c6156328dec52a55f90688cbfad21c83f8711d84
tried to fix a previous issue but it made things even
worse.
The real solution is to compile phy/ based on
CONFIG_USB_OTG_UTILS which gets selected by all PHY
drivers.
I only triggered the error recently after accepting a
patch which moved a bunch of code from otg/otg.c to
phy/phy.c and running 100 randconfig cycles.
Signed-off-by: Felipe Balbi <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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add support for Cinterion's products AH6 and PLS8 by adding Product IDs
and USB_DEVICE tuples.
Signed-off-by: Christian Schmiedl <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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1bf0cf6040 "usb: gadget: omap_udc: convert to udc_start/udc_stop"
made some trivial changes but was missing a ';' character.
8c4cc00552 "ARM: OMAP1: DMA: Moving OMAP1 DMA channel definitions
to mach-omap1" added a definition for OMAP_DMA_USB_W2FC_TX0 to
the driver while making the header file it was defined in
unavailable for drivers, but this driver actually needs
OMAP_DMA_USB_W2FC_RX0 as well.
Both changes appear trivial, so let's add the missing semicolon
and the macro definition.
Acked-by: Felipe Balbi <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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When boot_params->sentinel is set, all we really know is that some
undefined set of fields in struct boot_params contain garbage. In the
particular case of efi_info, however, there is a private magic for
that substructure, so it is generally safe to leave it even if the
bootloader is broken.
kexec (for which we did the initial analysis) did not initialize this
field, but of course all the EFI bootloaders do, and most EFI
bootloaders are broken in this respect (and should be fixed.)
Reported-by: Robin Holt <[email protected]>
Link: http://lkml.kernel.org/r/CA%2B5PVA51-FT14p4CRYKbicykugVb=PiaEycdQ57CK2km_OQuRQ@mail.gmail.com
Tested-by: Josh Boyer <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
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This reverts commit 200e0d99 ("USB: storage: optimize to match the
Huawei USB storage devices and support new switch command" and the
followup bugfix commit cd060956 ("USB: storage: properly handle
the endian issues of idProduct").
The commit effectively added a large number of Huawei devices to
the deprecated usb-storage mode switching logic. Many of these
devices have been in use and supported by the userspace
usb_modeswitch utility for years. Forcing the switching inside
the kernel causes a number of regressions as a result of ignoring
existing onfigurations, and also completely takes away the ability
to configure mode switching per device/system/user.
Known regressions caused by this:
- Some of the devices support multiple modes, using different
switching commands. There are existing configurations taking
advantage of this.
- There is a real use case for disabling mode switching and
instead mounting the exposed storage device. This becomes
impossible with switching logic inside the usb-storage driver.
- At least on device fail as a result of the usb-storage switching
command, becoming completely unswitchable. This is possibly a
firmware bug, but still a regression because the device work as
expected using usb_modeswitch defaults.
In-kernel mode switching was deprecated years ago with the
development of the more user friendly userspace alternatives. The
existing list of devices in usb-storage was only kept to prevent
breaking already working systems. The long term plan is to remove
the list, not to add to it. Ref:
http://permalink.gmane.org/gmane.linux.usb.general/28543
Cc: <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Bjørn Mork <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Acked-by: Matthew Dharm <[email protected]>
Signed-off-by: Bjørn Mork <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Fixes this build failure:
gcc -Wall -Wextra -g -lpthread -I../include -o testusb testusb.c
gcc -Wall -Wextra -g -lpthread -I../include -o ffs-test ffs-test.c
In file included from ffs-test.c:41:0:
../../include/linux/usb/functionfs.h:4:39: fatal error:
uapi/linux/usb/functionfs.h: No such file or directory
compilation terminated.
make: *** [ffs-test] Error 1
Signed-off-by: Maxin B. John <[email protected]>
Acked-by: Michal Nazarewicz <[email protected]>
Cc: stable <[email protected]> # 3.7+
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Another device using CDC ACM with vendor specific protocol to mark
serial functions.
Cc: stable <[email protected]>
Signed-off-by: Bjørn Mork <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Henrik reported that his MacAir 3.1 would not boot with
| commit 8d57470d8f859635deffe3919d7d4867b488b85a
| Date: Fri Nov 16 19:38:58 2012 -0800
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| x86, mm: setup page table in top-down
It turns out that we do not calculate the real_end properly:
We try to get 2M size with 4K alignment, and later will round down
to 2M, so we will get less then 2M for first mapping, in extreme
case could be only 4K only. In Henrik's system it has (1M-32K) as
last usable rage is [mem 0x7f9db000-0x7fef8fff].
The problem is exposed when EFI booting have several holes and it
will force mapping to use PTE instead as we only map usable areas.
To fix it, just make it be 2M aligned, so we can be guaranteed to be
able to use large pages to map it.
Reported-by: Henrik Rydberg <[email protected]>
Bisected-by: Henrik Rydberg <[email protected]>
Tested-by: Henrik Rydberg <[email protected]>
Signed-off-by: Yinghai Lu <[email protected]>
Link: http://lkml.kernel.org/r/CAE9FiQX4nQ7_1kg5RL_vh56rmcSHXUi1ExrZX7CwED4NGMnHfg@mail.gmail.com
Signed-off-by: H. Peter Anvin <[email protected]>
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The commit 27be457000211a6903968dfce06d5f73f051a217
('x86 idle: remove 32-bit-only "no-hlt" parameter, hlt_works_ok
flag') removed the hlt_works_ok flag from struct cpuinfo_x86, but
boot_cpu_data and new_cpu_data initializers were not changed
causing setting f00f_bug flag, instead of fdiv_bug.
If CONFIG_X86_F00F_BUG is not set the f00f_bug flag is never
cleared.
To avoid such problems in future C99-style initialization is now
used.
Signed-off-by: Krzysztof Mazur <[email protected]>
Acked-by: Borislav Petkov <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
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Raid56 merge (merge commit e942f88) had mistakenly removed a call to
__cancel_balance(), which resulted in balance not cleaning up after itself
after a successful finish. (Cleanup includes switching the state, removing
the balance item and releasing mut_ex_op testnset lock.) Bring it back.
Reported-by: David Sterba <[email protected]>
Signed-off-by: Ilya Dryomov <[email protected]>
Signed-off-by: Chris Mason <[email protected]>
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Commit 1fe42740 ("ARM: dts: mxs: Add the LCD to the 10049 board") seem
to have been applied with some fuzzyness, and the framebuffer
initialisation code for the CFA-10049 ended up in the CFA-10037
initialisation function.
Signed-off-by: Maxime Ripard <[email protected]>
Signed-off-by: Shawn Guo <[email protected]>
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Cc: [email protected]
Signed-off-by: Pavel Shilovsky <[email protected]>
Signed-off-by: Steve French <[email protected]>
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This patch adds #dma-cells property to PL330 DMA controller
nodes for supporting generic dma dt bindings on samsung exynos
platforms. #dma-channels and #dma-requests are not required now
but added in advance.
Signed-off-by: Padmavathi Venna <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Signed-off-by: Kukjin Kim <[email protected]>
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git://people.freedesktop.org/~danvet/drm-intel into drm-next
A bunch of fixes, nothing truely horrible:
- Fix PCH irq handling race which resulted in missed gmbus/dp aux irqs
and subsequent fallout (Paulo)
- Fixup off-by-one in our hsw id table (Kenneth)
- Fixup ilk rc6 support (disabled by default), regression introduced in
3.8
- g4x plane w/a from Egbert Eich
- gen2/3/4 dpms suspend/standy fixes for VGA outputs from Patrik Jakobsson
- Workaround dying ivb machines with less aggressive rc6 values (Stéphane
Marchesin)
* 'drm-intel-fixes' of git://people.freedesktop.org/~danvet/drm-intel:
drm/i915: Turn off hsync and vsync on ADPA when disabling crt
drm/i915: Fix incorrect definition of ADPA HSYNC and VSYNC bits
drm/i915: also disable south interrupts when handling them
drm/i915: enable irqs earlier when resuming
drm/i915: Increase the RC6p threshold.
DRM/i915: On G45 enable cursor plane briefly after enabling the display plane.
drm/i915: Fix Haswell/CRW PCI IDs.
drm/i915: Don't clobber crtc->fb when queue_flip fails
drm/i915: wait_event_timeout's timeout is in jiffies
drm/i915: Fix missing variable initilization
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We had a recent fix to fix the release of pagecache pages when
cifs_writev_requeue writes fail. Unfortunately, it releases the page
before trying to unlock it. At that point, the page might be gone by the
time the unlock comes in.
Unlock the page first before checking the value of "rc", and only then
end writeback and release the pages. The page lock isn't required for
any of those operations so this should be safe.
Reported-by: Anton Altaparmakov <[email protected]>
Signed-off-by: Jeff Layton <[email protected]>
Signed-off-by: Steve French <[email protected]>
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...as promised for 3.9.
Signed-off-by: Jeff Layton <[email protected]>
Signed-off-by: Steve French <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-next into for-linus-3.9
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cifs_rename_pending_delete() attempts to silly rename file using
CIFSSMBRenameOpenFile(). This uses the SET_FILE_INFORMATION TRANS2
command with information level set to the passthru info-level
SMB_SET_FILE_RENAME_INFORMATION.
We need to check to make sure that the server support passthru
info-levels before attempting the silly rename or else we will fail to
rename the file.
Signed-off-by: Sachin Prabhu <[email protected]>
Reviewed-by: Jeff Layton <[email protected]>
Signed-off-by: Steve French <[email protected]>
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Fix check for error condition after setting attributes with
CIFSSMBSetFileInfo().
Signed-off-by: Sachin Prabhu <[email protected]>
Reviewed-by: Jeff Layton <[email protected]>
Reviewed-by: Pavel Shilovsky <[email protected]>
Signed-off-by: Steve French <[email protected]>
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WARNING: vmlinux.o(.text+0xfb80): Section mismatch in reference
from the function armpmu_register() to the function
.init.text:armpmu_init()
The function armpmu_register() references
the function __init armpmu_init().
This is often because armpmu_register lacks a __init
annotation or the annotation of armpmu_init is wrong.
Just drop the __init marking on armpmu_init() because
armpmu_register() no longer has an __init marking.
Acked-by: Will Deacon <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>
Signed-off-by: Russell King <[email protected]>
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decompressor
Before jumping to (position independent) C-code from the decompressor's
assembler world we set-up the C environment. This setup currently does not
set r9, which for arm-none-uclinux-uclibceabi toolchains is by default
expected to be the PIC offset base register (IE should point to the
beginning of the GOT).
Currently, therefore, in order to build working kernels that use the
decompressor it is necessary to use an arm-linux-gnueabi toolchain, or
similar. uClinux toolchains cause a prefetch abort to occur at the beginning
of the decompress_kernel function.
This patch allows uClinux toolchains to build bootable zImages by forcing
the -mno-single-pic-base option, which ensures that the location of the GOT
is re-derived each time it is required, and r9 becomes free for use as a
general purpose register.
This has a small (4% in instruction terms) advantage over the alternative of
setting r9 to point to the GOT before calling into the C-world.
Signed-off-by: Jonathan Austin <[email protected]>
Acked-by: Nicolas Pitre <[email protected]>
Signed-off-by: Russell King <[email protected]>
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* pm-fixes:
cpufreq / intel_pstate: Do not load on VM that does not report max P state.
cpufreq / intel_pstate: Fix intel_pstate_init() error path
PM / QoS: Remove device PM QoS sysfs attributes at the right place
PM / QoS: Fix concurrency issues and memory leaks in device PM QoS
cpufreq: highbank: do not initialize array with a loop
PM / OPP: improve introductory documentation
cpufreq: Fix a typo in comment
mailbox, pl320-ipc: remove __init from probe function
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* acpi-fixes:
ACPI / glue: Drop .find_bridge() callback from struct acpi_bus_type
ACPI / glue: Add .match() callback to struct acpi_bus_type
ACPI / porocessor: Beautify code, pr->id is u32 which is never < 0
ACPI / processor: Remove redundant NULL check before kfree
ACPI / Sleep: Avoid interleaved message on errors
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It seems some VMs support the P state MSRs but return zeros. Fail
gracefully if we are running in this environment.
References: https://bugzilla.redhat.com/show_bug.cgi?id=916833
Reported-by: Josh Boyer <[email protected]>
Signed-off-by: Dirk Brandewie <[email protected]>
Acked-by: Viresh Kumar <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
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If cpufreq_register_driver() fails just free memory that has been
allocated and return. intel_pstate_exit() function is removed since we
are built-in only now there is no reason for a module exit procedure.
Reported-by: Konrad Rzeszutek Wilk <[email protected]>
Signed-off-by: Dirk Brandewie <[email protected]>
Acked-by: Viresh Kumar <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
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Dave reported following crash :
general protection fault: 0000 [#1] SMP
CPU 2
Pid: 25407, comm: qemu-kvm Not tainted 3.7.9-205.fc18.x86_64 #1 Hewlett-Packard HP Z400 Workstation/0B4Ch
RIP: 0010:[<ffffffffa0399bd5>] [<ffffffffa0399bd5>] destroy_conntrack+0x35/0x120 [nf_conntrack]
RSP: 0018:ffff880276913d78 EFLAGS: 00010206
RAX: 50626b6b7876376c RBX: ffff88026e530d68 RCX: ffff88028d158e00
RDX: ffff88026d0d5470 RSI: 0000000000000011 RDI: 0000000000000002
RBP: ffff880276913d88 R08: 0000000000000000 R09: ffff880295002900
R10: 0000000000000000 R11: 0000000000000003 R12: ffffffff81ca3b40
R13: ffffffff8151a8e0 R14: ffff880270875000 R15: 0000000000000002
FS: 00007ff3bce38a00(0000) GS:ffff88029fc40000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00007fd1430bd000 CR3: 000000027042b000 CR4: 00000000000027e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process qemu-kvm (pid: 25407, threadinfo ffff880276912000, task ffff88028c369720)
Stack:
ffff880156f59100 ffff880156f59100 ffff880276913d98 ffffffff815534f7
ffff880276913db8 ffffffff8151a74b ffff880270875000 ffff880156f59100
ffff880276913dd8 ffffffff8151a5a6 ffff880276913dd8 ffff88026d0d5470
Call Trace:
[<ffffffff815534f7>] nf_conntrack_destroy+0x17/0x20
[<ffffffff8151a74b>] skb_release_head_state+0x7b/0x100
[<ffffffff8151a5a6>] __kfree_skb+0x16/0xa0
[<ffffffff8151a666>] kfree_skb+0x36/0xa0
[<ffffffff8151a8e0>] skb_queue_purge+0x20/0x40
[<ffffffffa02205f7>] __tun_detach+0x117/0x140 [tun]
[<ffffffffa022184c>] tun_chr_close+0x3c/0xd0 [tun]
[<ffffffff8119669c>] __fput+0xec/0x240
[<ffffffff811967fe>] ____fput+0xe/0x10
[<ffffffff8107eb27>] task_work_run+0xa7/0xe0
[<ffffffff810149e1>] do_notify_resume+0x71/0xb0
[<ffffffff81640152>] int_signal+0x12/0x17
Code: 00 00 04 48 89 e5 41 54 53 48 89 fb 4c 8b a7 e8 00 00 00 0f 85 de 00 00 00 0f b6 73 3e 0f b7 7b 2a e8 10 40 00 00 48 85 c0 74 0e <48> 8b 40 28 48 85 c0 74 05 48 89 df ff d0 48 c7 c7 08 6a 3a a0
RIP [<ffffffffa0399bd5>] destroy_conntrack+0x35/0x120 [nf_conntrack]
RSP <ffff880276913d78>
This is because tun_net_xmit() needs to call nf_reset()
before queuing skb into receive_queue
Reported-by: Dave Jones <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless
John W. Linville says:
====================
This time just passing along a big batch of fixes from Johannes...
For the mac80211 bits:
"Here I have fixes from Ben Greear for stray work items when deleting
interfaces, another idle handling fix from Felix, a fix from Marco ro a
mesh PS buffering crash and I have a fix for the VHT MCS calculation in
association request frames and more nl80211 feature advertising removal
as well as a workaround to increase the dump size if the SKB overhead is
too large. For 3.10 I already have a complete fix queued, but that also
requires (simple) userspace changes."
And for the iwlwifi bits:
"The patches from Dor fix a bunch of calibration issues in the new MVM
driver, and Emmanuel has a number of fixes there as well. Also, we
decided to disable 8k A-MSDU by default, so that's in there. My own
patches are addressing an issue we found with the new devices but that
seems to also exist on older ones, the DMA writeback the devices do can
be delayed and cause issues. The fix is unfortunately relatively large
and depends on two other changes (to not be hugely conflicting), but I
think it's still worth it at this point."
As Johannes says, it is a bit large. But I hope it is still early
enough in the cycle to make that worthwhile.
====================
Signed-off-by: David S. Miller <[email protected]>
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The SLIPORT_SEMAPHORE register shadowed in the
config-space may not reflect the correct POST stage after
an EEH reset in BE2/3; it may return FW_READY state even though
FW is not ready. This causes the driver to prematurely
poll the FW mailbox and fail.
For BE2/3 use the CSR-BAR/0xac instead.
Reported-by: Gavin Shan <[email protected]>
Signed-off-by: Sathya Perla <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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Signed-off-by: Jason Wang <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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Ben Hutchings says:
====================
Fix regressions introduced by the last set of fixes (sorry):
1. Potential deadlock when disabling TX queues.
2. RX was broken on architectures other than x86 and powerpc.
I still expect to send one more bug fix for 3.9, but as it sometimes
takes days to reproduce the bug it's going to take a couple of weeks of
testing to be confident that it's really fixed.
====================
Signed-off-by: David S. Miller <[email protected]>
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RX DMA buffers start at an offset of EFX_PAGE_IP_ALIGN bytes from the
start of a cache line. This offset obviously needs to be included in
the virtual address, but this was missed in commit b590ace09d51
('sfc: Fix efx_rx_buf_offset() in the presence of swiotlb') since
EFX_PAGE_IP_ALIGN is equal to 0 on both x86 and powerpc.
Signed-off-by: Ben Hutchings <[email protected]>
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efx_device_detach_sync() locks all TX queues before marking the device
detached and thus disabling further TX scheduling. But it can still
be interrupted by TX completions which then result in TX scheduling in
soft interrupt context. This will deadlock when it tries to acquire
a TX queue lock that efx_device_detach_sync() already acquired.
To avoid deadlock, we must use netif_tx_{,un}lock_bh().
Signed-off-by: Ben Hutchings <[email protected]>
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According to PRM we need to disable hsync and vsync even though ADPA is
disabled. The previous code did infact do the opposite so we fix it.
Signed-off-by: Patrik Jakobsson <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=56359
Tested-by: max <[email protected]>
Cc: [email protected]
Signed-off-by: Daniel Vetter <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless into for-davem
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krb5 mounts started failing as of
683428fae8c73d7d7da0fa2e0b6beb4d8df4e808 "sunrpc: Update svcgss xdr
handle to rpsec_contect cache".
The problem is that mounts are usually done with some host principal
which isn't normally mapped to any user, in which case svcgssd passes
down uid -1, which the kernel is then expected to map to the
export-specific anonymous uid or gid.
The new uid_valid/gid_valid checks were therefore causing that downcall
to fail.
(Note the regression may not have been seen with older userspace that
tended to map unknown principals to an anonymous id on their own rather
than leaving it to the kernel.)
Reviewed-by: "Eric W. Biederman" <[email protected]>
Signed-off-by: J. Bruce Fields <[email protected]>
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The git commit d5aaffa9dd531c978c6f3fea06a2972653bd7fc8
(cpufreq: handle cpufreq being disabled for all exported function)
tightens the cpufreq API by returning errors when disable_cpufreq()
had been called.
The problem we are hitting is that the module xen-acpi-processor which
uses the ACPI's functions: acpi_processor_register_performance,
acpi_processor_preregister_performance, and acpi_processor_notify_smm
fails at acpi_processor_register_performance with -22.
Note that earlier during bootup in arch/x86/xen/setup.c there is also
an call to cpufreq's API: disable_cpufreq().
This is b/c we want the Linux kernel to parse the ACPI data, but leave
the cpufreq decisions to the hypervisor.
In v3.9 all the checks that d5aaffa9dd531c978c6f3fea06a2972653bd7fc8
added are now hit and the calls to cpufreq_register_notifier will now
fail. This means that acpi_processor_ppc_init ends up printing:
"Warning: Processor Platform Limit not supported"
and the acpi_processor_ppc_status is not set.
The repercussions of that is that the call to
acpi_processor_register_performance fails right away at:
if (!(acpi_processor_ppc_status & PPC_REGISTERED))
and we don't progress any further on parsing and extracting the _P*
objects.
The only reason the Xen code called that function was b/c it was
exported and the only way to gather the P-states. But we can also
just make acpi_processor_get_performance_info be exported and not
use acpi_processor_register_performance. This patch does so.
Acked-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>
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