diff options
| author | Jaegeuk Kim <jaegeuk@google.com> | 2020-11-17 19:58:34 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2020-11-20 06:00:51 +0300 |
| commit | b664511297644eac34038df877b3ad7bcaa81913 (patch) | |
| tree | 9f01cafd18fe1038e24833f1636423851d7fcbc4 /drivers/scsi/ufs | |
| parent | fd62de114f8c9df098dcd43b5d83c5714176dd12 (diff) | |
| download | linux-b664511297644eac34038df877b3ad7bcaa81913.tar.xz | |
scsi: ufs: Atomic update for clkgating_enable
While running a stress test which enables/disables clkgating, we
occasionally hit device timeout. This patch avoids a subtle race condition
to address it.
Link: https://lore.kernel.org/r/20201117165839.1643377-3-jaegeuk@kernel.org
Reviewed-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@google.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 | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 9f53f6391342..32874029b9b4 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -1818,19 +1818,19 @@ static ssize_t ufshcd_clkgate_enable_store(struct device *dev, return -EINVAL; value = !!value; + + spin_lock_irqsave(hba->host->host_lock, flags); if (value == hba->clk_gating.is_enabled) goto out; - if (value) { - ufshcd_release(hba); - } else { - spin_lock_irqsave(hba->host->host_lock, flags); + if (value) + __ufshcd_release(hba); + else hba->clk_gating.active_reqs++; - spin_unlock_irqrestore(hba->host->host_lock, flags); - } hba->clk_gating.is_enabled = value; out: + spin_unlock_irqrestore(hba->host->host_lock, flags); return count; } |