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2010-10-29MIPS: AR7: Add support for Titan (TNETV10xx) SoC variantFlorian Fainelli5-13/+345
Add support for Titan TNETV1050,1055,1056,1060 variants. This SoC is almost completely identical to AR7 except on a few points: - a second bank of gpios is available - vlynq0 on titan is vlynq1 on ar7 - different PHY addresses for cpmac0 This SoC can be found on commercial products like the Linksys WRTP54G Original patch by Xin with improvments by Florian. Signed-off-by: Xin Zhen <[email protected]> Signed-off-by: Florian Fainelli <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1563/ Signed-off-by: Ralf Baechle <[email protected]> ---
2010-10-29MIPS: AR7: Initialize GPIO earlierFlorian Fainelli3-2/+5
In order to detect the Titan variant, we must initialize GPIOs earlier since detection relies on some GPIO values to be set. Signed-off-by: Florian Fainelli <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1562/ Signed-off-by: Ralf Baechle <[email protected]> ---
2010-10-29MIPS: Add platform device and Kconfig for Octeon USB EHCI / OHCIDavid Daney2-1/+106
Declare that OCTEON reference boards have both OHCI and EHCI. Add platform devices for the corresponding hardware. Signed-off-by: David Daney <[email protected]> To: [email protected] To: [email protected] Patchwork: http://patchwork.linux-mips.org/patch/1676/ Acked-by: Greg Kroah-Hartman <[email protected]> Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29USB: Add EHCI and OHCH glue for OCTEON II SOCs.David Daney7-2/+645
The OCTEON II SOC has USB EHCI and OHCI controllers connected directly to the internal I/O bus. This patch adds the necessary 'glue' logic to allow ehci-hcd and ohci-hcd drivers to work on OCTEON II. The OCTEON normally runs big-endian, and the ehci/ohci internal registers have host endianness, so we need to select USB_EHCI_BIG_ENDIAN_MMIO. The ehci and ohci blocks share a common clocking and PHY infrastructure. Initialization of the host controller and PHY clocks is common between the two and is factored out into the octeon2-common.c file. Setting of USB_ARCH_HAS_OHCI and USB_ARCH_HAS_EHCI is done in arch/mips/Kconfig in a following patch. Signed-off-by: David Daney <[email protected]> To: [email protected] To: [email protected] Patchwork: http://patchwork.linux-mips.org/patch/1675/ Acked-by: Greg Kroah-Hartman <[email protected]> Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Octeon: Add register definitions for EHCI / OHCI USB glue logic.David Daney1-0/+261
The EHCI and OHCI blocks connection to the I/O bus is controlled by these registers. Signed-off-by: David Daney <[email protected]> To: [email protected] To: [email protected] Patchwork: http://patchwork.linux-mips.org/patch/1674/ Acked-by: Greg Kroah-Hartman <[email protected]> Signed-off-by: Ralf Baechle <[email protected]> create mode 100644 arch/mips/include/asm/octeon/cvmx-uctlx-defs.h
2010-10-29MIPS: Octeon: Apply CN63XXP1 errata workarounds.David Daney4-5/+69
The CN63XXP1 needs a couple of workarounds to ensure memory is not written in unexpected ways. All PREF with hints in the range 0-4,6-24 are replaced with PREF 28. We pass a flag to the assembler to cover compiler generated code, and patch uasm for the dynamically generated code. The write buffer threshold is reduced to 4. Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1672/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29WATCHDOG: octeon-wdt: Use I/O clock rate for timing calculations.David Daney1-2/+2
The creation of the I/O clock domain requires some adjustments. Since the watchdog counters are clocked by the I/O clock, use its rate for timing calculations. Signed-off-by: David Daney <[email protected]> Cc: Wim Van Sebroeck <[email protected]> Cc: [email protected] Patchwork: http://patchwork.linux-mips.org/patch/1659/ Acked-by: Wim Van Sebroeck <[email protected]> Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29ATA: pata_octeon_cf: Use I/O clock rate for timing calculations.David Daney1-1/+1
The creation of the I/O clock domain requires some adjustments. Since the CF bus timing logic is clocked by the I/O clock, use its rate for delay calculations. Signed-off-by: David Daney <[email protected]> Cc: Jeff Garzik <[email protected]> Cc: [email protected] Patchwork: http://patchwork.linux-mips.org/patch/1660/ Acked-by: Jeff Garzik <[email protected]> Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Octeon: Use I/O clock rate for calculations.David Daney2-2/+2
The I2C and UARTS are clocked by the I/O clock, use its rate for these devices. Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1670/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Octeon: Add octeon_get_io_clock_rate() for cn63xxDavid Daney2-28/+49
Starting with cn63xx Octeon I/O blocks are clocked at a different rate than the CPU. Add a new function octeon_get_io_clock_rate() that yields the I/O clock rate. Also rearrange octeon_get_clock_rate() to get the value from the saved sysinfo structure. Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1671/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Octeon: Remove bogus code from octeon_get_clock_rate()David Daney1-2/+0
We can run with any simulator clock rate. Get rid of the code overriding it to 6MHz. Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1669/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Octeon: Scale Octeon2 clocks in octeon_init_cvmcount()David Daney1-3/+31
The per-CPU clocks are synchronized from IPD_CLK_COUNT, on cn63XX it must be scaled by the clock frequency ratio. Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1667/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Octeon: Enable Read Inhibit / eXecute Inhibit on Octeon II.David Daney1-1/+1
Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1666/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Octeon: Probe for Octeon II CPUs.David Daney1-0/+7
The OCTEON II ISA extends the original OCTEON ISA, so give it its own __elf_platform string so optimized libraries can be selected in userspace. Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1665/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Octeon: Handle Octeon II caches.David Daney1-1/+15
Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1664/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Add identifiers for Octeon II CPUs.David Daney1-1/+2
Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1662/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Octeon: Update L2 Cache code for CN63XXDavid Daney3-417/+629
The CN63XX has a different L2 cache architecture. Update the helper functions to reflect this. Some joining of split lines was also done to improve readability, as well as reformatting of comments. Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1663/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Octeon: Add cn63XX to Octeon chip detection macros.David Daney1-8/+28
Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1661/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Octeon: Update register definitions for CN63XX chipsDavid Daney20-2161/+4212
The CN63XX is a new 6-CPU SOC based on the new OCTEON II CPU cores. Join some lines back together. This makes some of them exceed 80 columns, but they are uninteresting and this unclutters things. Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1668/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Octeon: Rewrite DMA mapping functions.David Daney6-301/+389
All Octeon chips can support more than 4GB of RAM. Also due to how Octeon PCI is setup, even some configurations with less than 4GB of RAM will have portions that are not accessible from 32-bit devices. Enable the swiotlb code to handle the cases where a device cannot directly do DMA. This is a complete rewrite of the Octeon DMA mapping code. Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1639/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Add a platform hook for swiotlb setup.David Daney2-0/+13
This allows platforms that are using the swiotlb to initialize it. Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1638/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Convert DMA to use dma-mapping-common.hDavid Daney8-153/+136
Use asm-generic/dma-mapping-common.h to handle all DMA mapping operations and establish a default get_dma_ops() that forwards all operations to the existing code. Augment dev_archdata to carry a pointer to the struct dma_map_ops, allowing DMA operations to be overridden on a per device basis. Currently this is never filled in, so the default dma_map_ops are used. A follow-on patch sets this for Octeon PCI devices. Also initialize the dma_debug system as it is now used if it is configured. Includes fixes by Kevin Cernekee <[email protected]>. Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1637/ Patchwork: http://patchwork.linux-mips.org/patch/1678/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: ip32, ip27, jazz: Make static functions in dma-coherence.h inline.David Daney3-8/+8
Any function defined in a header file should be inline. This helps us avoid 'unused' compiler warnings when we include the files in more places in subsequent patches. Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1636/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Octeon: Select ZONE_DMA32David Daney1-0/+1
Give us a nice place to allocate coherent DMA memory for 32-bit devices. Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1635/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Octeon: Adjust top of DMA32 zone.David Daney1-0/+6
On OCTEON, we reserve the last 256MB of 32-bit PCI address space, mapping the RAM in this region at a high DMA address. This makes memory in this region unavailable for 32-bit DMA. Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1634/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Allow MAX_DMA32_PFN to be overridden.David Daney1-0/+3
DMA mapping may reduce the usable physical address range usable for 32-bit DMA. Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1633/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Octeon: Set dma_masks for octeon_mgmt device.David Daney1-0/+5
This allows follow-on patches to dma mapping functions to work with the octeon mgmt device.. Signed-off-by: David Daney <[email protected]> Patchwork: http://patchwork.linux-mips.org/patch/1632/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: IRQ: Add stackoverflow detectionFrom: [email protected]3-0/+35
Add stackoverflow detection to mips arch Signed-off-by: Adam Jiang <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Patchwork: https://patchwork.linux-mips.org/patch/1559/ Patchwork: https://patchwork.linux-mips.org/patch/1651/ Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Kconfig cleanupThomas Gleixner1-2/+0
arch/mips/Kconfig already sets GENERIC_HARDIRQS_NO__DO_IRQ unconditionally. Remove the redundant select from the Loongson Kconfig. Signed-off-by: Thomas Gleixner <[email protected]> Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Remove wait argument of r4k_on_each_cpuRalf Baechle1-11/+9
All callers were passing in 1 anyway. Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: More detailed description of r4k_on_each_cpuRalf Baechle1-0/+1
Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29MIPS: Get rid of branches to .subsections.Ralf Baechle5-297/+243
It was a nice optimization - on paper at least. In practice it results in branches that may exceed the maximum legal range for a branch. We can fight that problem with -ffunction-sections but -ffunction-sections again is incompatible with -pg used by the function tracer. By rewriting the loop around all simple LL/SC blocks to C we reduce the amount of inline assembler and at the same time allow GCC to often fill the branch delay slots with something sensible or whatever else clever optimization it may have up in its sleeve. With this optimization gone we also no longer need -ffunction-sections, so drop it. This optimization was originally introduced in 2.6.21, commit 5999eca25c1fd4b9b9aca7833b04d10fe4bc877d (linux-mips.org) rsp. f65e4fa8e0c6022ad58dc88d1b11b12589ed7f9f (kernel.org). Original fix for the issues which caused me to pull this optimization by Paul Gortmaker <[email protected]>. Signed-off-by: Ralf Baechle <[email protected]>
2010-10-29Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6Linus Torvalds14-290/+526
* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6: cifs: Cleanup and thus reduce smb session structure and fields used during authentication NTLM auth and sign - Use appropriate server challenge cifs: add kfree() on error path NTLM auth and sign - minor error corrections and cleanup NTLM auth and sign - Use kernel crypto apis to calculate hashes and smb signatures NTLM auth and sign - Define crypto hash functions and create and send keys needed for key exchange cifs: cifs_convert_address() returns zero on error NTLM auth and sign - Allocate session key/client response dynamically cifs: update comments - [s/GlobalSMBSesLock/cifs_file_list_lock/g] cifs: eliminate cifsInodeInfo->write_behind_rc (try #6) [CIFS] Fix checkpatch warnings and bump cifs version number cifs: wait for writeback to complete in cifs_flush cifs: convert cifsFileInfo->count to non-atomic counter
2010-10-29readv/writev: do the same MAX_RW_COUNT truncation that read/write doesLinus Torvalds3-35/+40
We used to protect against overflow, but rather than return an error, do what read/write does, namely to limit the total size to MAX_RW_COUNT. This is not only more consistent, but it also means that any broken low-level read/write routine that still keeps counts in 'int' can't break. Signed-off-by: Linus Torvalds <[email protected]>
2010-10-29parisc-agp: fix missing slab.h includeKyle McMartin1-0/+1
Commit 338e4fab added a missing kfree if the alloc_pci_dev failed but forgot to include <linux/slab.h> for the definition of kfree. Signed-off-by: Kyle McMartin <[email protected]>
2010-10-29x86, ftrace: Use safe noops, drop trap testH. Peter Anvin1-54/+15
Always use a safe 5-byte noop sequence. Drop the trap test, since it is known to return false negatives on some virtualization platforms on 32 bits. The resulting code is both simpler and safer. Cc: Daniel Drake <[email protected]> Cc: Jason Baron <[email protected]> Cc: Mathieu Desnoyers <[email protected]> Signed-off-by: H. Peter Anvin <[email protected]> Signed-off-by: Steven Rostedt <[email protected]>
2010-10-29[SCSI] pmcraid: add support for set timestamp command and other fixesAnil Ravindranath2-22/+129
The following are the fixes in this patch: 1. Added support of set timestamp command in the driver 2. Pass all status code to mgmt application. Earlier we were passing only failed ones. 3. Call class_destroy after unregister_chrdev and pci_unregister_driver Signed-off-by: Anil Ravindranath <[email protected]> Signed-off-by: James Bottomley <[email protected]>
2010-10-29jump_label: Fix unaligned traps on sparc.David Miller1-0/+1
The vmlinux.lds.h knobs to emit the __jump_table section in the main kernel image takes care to align the section, but this doesn't help for the __jump_table section that gets emitted into modules. Fix the resulting lack of section alignment by explicitly specifying it in the assembler. Signed-off-by: David S. Miller <[email protected]> LKML-Reference: <[email protected]> Signed-off-by: Steven Rostedt <[email protected]>
2010-10-29jump label: Make arch_jump_label_text_poke_early() optionalSteven Rostedt1-0/+7
Some archs do not need to do anything special for jump labels on startup (like MIPS). This patch adds a weak function stub for arch_jump_label_text_poke_early(); Cc: Jason Baron <[email protected]> Cc: David Miller <[email protected]> Cc: David Daney <[email protected]> Suggested-by: Thomas Gleixner <[email protected]> LKML-Reference: <[email protected]> LKML-Reference: <[email protected]> Signed-off-by: Steven Rostedt <[email protected]>
2010-10-29jump label: Fix error with preempt disable holding mutexSteven Rostedt1-13/+13
Kprobes and jump label were having a race between mutexes that was fixed by reordering the jump label. But this reordering moved the jump label mutex into a preempt disable location. This patch does a little fiddling to move the grabbing of the jump label mutex from inside the preempt disable section and still keep the order correct between the mutex and the kprobes lock. Reported-by: Ingo Molnar <[email protected]> Acked-by: Masami Hiramatsu <[email protected]> Cc: Jason Baron <[email protected]> Signed-off-by: Steven Rostedt <[email protected]>
2010-10-29Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6Linus Torvalds19-78/+175
* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6: [S390] fix kprobes single stepping [S390] tape: fix dbf usage [S390] dasd: provide a Sense Path Group ID ioctl [S390] ftrace: select HAVE_C_RECORDMCOUNT [S390] vdso: get rid of redefinition warnings [S390] facility detection: remove unused variable [S390] hypfs: Fix error handling in hypfs_diag initialization [S390] topology: fix cpu masks for topology=off case [S390] topology: add SCHED_MC config option [S390] Kconfig: add machine type number to code generation options [S390] Add z196 machine type to setup_hwcaps
2010-10-29Merge git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linusLinus Torvalds3-6/+8
* git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linus: Squashfs: fix function prototype Squashfs: fix use of __le64 annotated variable
2010-10-29Merge branch 'for-linus' of git://neil.brown.name/mdLinus Torvalds9-205/+275
* 'for-linus' of git://neil.brown.name/md: md: tidy up device searches in read_balance. md/raid1: fix some typos in comments. md/raid1: discard unused variable. md: unplug writes to external bitmaps. md: use separate bio pool for each md device. md: change type of first arg to sync_page_io. md/raid1: perform mem allocation before disabling writes during resync. md: use bio_kmalloc rather than bio_alloc when failure is acceptable. md: Fix possible deadlock with multiple mempool allocations. md: fix and update workqueue usage md: use sector_t in bitmap_get_counter md: remove md_mutex locking. md: Fix regression with raid1 arrays without persistent metadata.
2010-10-29eCryptfs: Print mount_auth_tok_only param in ecryptfs_show_optionsTyler Hicks1-0/+2
When printing mount options, print the new ecryptfs_mount_auth_tok_only mount option. Signed-off-by: Tyler Hicks <[email protected]>
2010-10-29ecryptfs: added ecryptfs_mount_auth_tok_only mount parameterRoberto Sassu3-1/+17
This patch adds a new mount parameter 'ecryptfs_mount_auth_tok_only' to force ecryptfs to use only authentication tokens which signature has been specified at mount time with parameters 'ecryptfs_sig' and 'ecryptfs_fnek_sig'. In this way, after disabling the passthrough and the encrypted view modes, it's possible to make available to users only files encrypted with the specified authentication token. Signed-off-by: Roberto Sassu <[email protected]> Cc: Dustin Kirkland <[email protected]> Cc: James Morris <[email protected]> [Tyler: Clean up coding style errors found by checkpatch] Signed-off-by: Tyler Hicks <[email protected]>
2010-10-29ecryptfs: checking return code of ecryptfs_find_auth_tok_for_sig()Roberto Sassu1-2/+2
This patch replaces the check of the 'matching_auth_tok' pointer with the exit status of ecryptfs_find_auth_tok_for_sig(). This avoids to use authentication tokens obtained through the function ecryptfs_keyring_auth_tok_for_sig which are not valid. Signed-off-by: Roberto Sassu <[email protected]> Cc: Dustin Kirkland <[email protected]> Cc: James Morris <[email protected]> Signed-off-by: Tyler Hicks <[email protected]>
2010-10-29ecryptfs: release keys loaded in ecryptfs_keyring_auth_tok_for_sig()Roberto Sassu1-6/+28
This patch allows keys requested in the function ecryptfs_keyring_auth_tok_for_sig()to be released when they are no longer required. In particular keys are directly released in the same function if the obtained authentication token is not valid. Further, a new function parameter 'auth_tok_key' has been added to ecryptfs_find_auth_tok_for_sig() in order to provide callers the key pointer to be passed to key_put(). Signed-off-by: Roberto Sassu <[email protected]> Cc: Dustin Kirkland <[email protected]> Cc: James Morris <[email protected]> [Tyler: Initialize auth_tok_key to NULL in ecryptfs_parse_packet_set] Signed-off-by: Tyler Hicks <[email protected]>
2010-10-29eCryptfs: Clear LOOKUP_OPEN flag when creating lower fileTyler Hicks1-0/+4
eCryptfs was passing the LOOKUP_OPEN flag through to the lower file system, even though ecryptfs_create() doesn't support the flag. A valid filp for the lower filesystem could be returned in the nameidata if the lower file system's create() function supported LOOKUP_OPEN, possibly resulting in unencrypted writes to the lower file. However, this is only a potential problem in filesystems (FUSE, NFS, CIFS, CEPH, 9p) that eCryptfs isn't known to support today. https://bugs.launchpad.net/ecryptfs/+bug/641703 Reported-by: Kevin Buhr Cc: stable <[email protected]> Signed-off-by: Tyler Hicks <[email protected]>
2010-10-29ecryptfs: call vfs_setxattr() in ecryptfs_setxattr()Roberto Sassu1-4/+3
Ecryptfs is a stackable filesystem which relies on lower filesystems the ability of setting/getting extended attributes. If there is a security module enabled on the system it updates the 'security' field of inodes according to the owned extended attribute set with the function vfs_setxattr(). When this function is performed on a ecryptfs filesystem the 'security' field is not updated for the lower filesystem since the call security_inode_post_setxattr() is missing for the lower inode. Further, the call security_inode_setxattr() is missing for the lower inode, leading to policy violations in the security module because specific checks for this hook are not performed (i. e. filesystem 'associate' permission on SELinux is not checked for the lower filesystem). This patch replaces the call of the setxattr() method of the lower inode in the function ecryptfs_setxattr() with vfs_setxattr(). Signed-off-by: Roberto Sassu <[email protected]> Cc: stable <[email protected]> Cc: Dustin Kirkland <[email protected]> Acked-by: James Morris <[email protected]> Signed-off-by: Tyler Hicks <[email protected]>
2010-10-29Btrfs: fix raid code for removing missing drivesChris Mason1-2/+1
When btrfs is mounted in degraded mode, it has some internal structures to track the missing devices. This missing device is setup as readonly, but the mapping code can get upset when we try to write to it. This changes the mapping code to return -EIO instead of oops when we try to write to the readonly device. Signed-off-by: Chris Mason <[email protected]>
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