On 11/2/2020 10:24 PM, Can Guo wrote:
The scsi_block_reqs_cnt increased in ufshcd_hold() is supposed to be decreased back in ufshcd_ungate_work() in a paired way. However, if specific ufshcd_hold/release sequences are met, it is possible that scsi_block_reqs_cnt is increased twice but only one ungate work is queued. To make sure scsi_block_reqs_cnt is handled by ufshcd_hold() and ufshcd_ungate_work() in a paired way, increase it only if queue_work() returns true. Signed-off-by: Can Guo <cang@xxxxxxxxxxxxxx> Reviewed-by: Hongwu Su <hongwus@xxxxxxxxxxxxxx> ---
Reviewed-by: Asutosh Das <asutoshd@xxxxxxxxxxxxxx>
drivers/scsi/ufs/ufshcd.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 847f355..efa7d86 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -1634,12 +1634,12 @@ int ufshcd_hold(struct ufs_hba *hba, bool async) */ /* fallthrough */ case CLKS_OFF: - ufshcd_scsi_block_requests(hba); hba->clk_gating.state = REQ_CLKS_ON; trace_ufshcd_clk_gating(dev_name(hba->dev), hba->clk_gating.state); - queue_work(hba->clk_gating.clk_gating_workq, - &hba->clk_gating.ungate_work); + if (queue_work(hba->clk_gating.clk_gating_workq, + &hba->clk_gating.ungate_work)) + ufshcd_scsi_block_requests(hba); /* * fall through to check if we should wait for this * work to be done or not.
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