diff options
| author | Adrian Hunter <adrian.hunter@intel.com> | 2021-11-08 07:48:14 +0100 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2021-11-17 01:42:31 +0100 |
| commit | 886fe2915cce6658b0fc19e64b82879325de61ea (patch) | |
| tree | 18d20c876f5eb81b043cb3024d49f24fbbabc99d /drivers/scsi/ufs | |
| parent | scsi: core: sysfs: Fix hang when device state is set via sysfs (diff) | |
| download | linux-886fe2915cce6658b0fc19e64b82879325de61ea.tar.xz linux-886fe2915cce6658b0fc19e64b82879325de61ea.zip | |
scsi: ufs: core: Fix task management completion timeout race
__ufshcd_issue_tm_cmd() clears req->end_io_data after timing out, which
races with the completion function ufshcd_tmc_handler() which expects
req->end_io_data to have a value.
Note __ufshcd_issue_tm_cmd() and ufshcd_tmc_handler() are already
synchronized using hba->tmf_rqs and hba->outstanding_tasks under the
host_lock spinlock.
It is also not necessary (nor typical) to clear req->end_io_data because
the block layer does it before allocating out requests e.g. via
blk_get_request().
So fix by not clearing it.
Link: https://lore.kernel.org/r/20211108064815.569494-2-adrian.hunter@intel.com
Fixes: f5ef336fd2e4 ("scsi: ufs: core: Fix task management completion")
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/ufs')
| -rw-r--r-- | drivers/scsi/ufs/ufshcd.c | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index c32bd78820af..c18aa9a43f0a 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -6616,11 +6616,6 @@ static int __ufshcd_issue_tm_cmd(struct ufs_hba *hba, err = wait_for_completion_io_timeout(&wait, msecs_to_jiffies(TM_CMD_TIMEOUT)); if (!err) { - /* - * Make sure that ufshcd_compl_tm() does not trigger a - * use-after-free. - */ - req->end_io_data = NULL; ufshcd_add_tm_upiu_trace(hba, task_tag, UFS_TM_ERR); dev_err(hba->dev, "%s: task management cmd 0x%.2x timed-out\n", __func__, tm_function); |