diff options
| author | Pawel Laszczak <pawell@cadence.com> | 2021-09-07 08:26:19 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-09-14 10:32:41 +0200 |
| commit | b69ec50b3e55c4b2a85c8bc46763eaf330605847 (patch) | |
| tree | 34db91b982bec653060f528574ab7c740dfd1708 /drivers/usb/class/cdc-acm.c | |
| parent | 17956b53ebff6a490baf580a836cbd3eae94892b (diff) | |
usb: cdns3: fix race condition before setting doorbell
For DEV_VER_V3 version there exist race condition between clearing
ep_sts.EP_STS_TRBERR and setting ep_cmd.EP_CMD_DRDY bit.
Setting EP_CMD_DRDY will be ignored by controller when
EP_STS_TRBERR is set. So, between these two instructions we have
a small time gap in which the EP_STSS_TRBERR can be set. In such case
the transfer will not start after setting doorbell.
Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver")
cc: <stable@vger.kernel.org> # 5.12.x
Tested-by: Aswath Govindraju <a-govindraju@ti.com>
Reviewed-by: Aswath Govindraju <a-govindraju@ti.com>
Signed-off-by: Pawel Laszczak <pawell@cadence.com>
Link: https://lore.kernel.org/r/20210907062619.34622-1-pawell@gli-login.cadence.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/class/cdc-acm.c')
0 files changed, 0 insertions, 0 deletions