From: Can Guo <cang@codeaurora.org>
To: asutoshd@codeaurora.org, nguyenb@codeaurora.org,
hongwus@codeaurora.org, rnayak@codeaurora.org,
linux-scsi@vger.kernel.org, kernel-team@android.com,
saravanak@google.com, salyzyn@google.com, cang@codeaurora.org
Cc: Alim Akhtar <alim.akhtar@samsung.com>,
Avri Altman <avri.altman@wdc.com>,
"James E.J. Bottomley" <jejb@linux.ibm.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Stanley Chu <stanley.chu@mediatek.com>,
Bean Huo <beanhuo@micron.com>,
Bart Van Assche <bvanassche@acm.org>,
linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v1 1/2] scsi: ufs: Fix unbalanced scsi_block_reqs_cnt caused by ufshcd_hold()
Date: Mon, 2 Nov 2020 22:24:39 -0800 [thread overview]
Message-ID: <1604384682-15837-2-git-send-email-cang@codeaurora.org> (raw)
In-Reply-To: <1604384682-15837-1-git-send-email-cang@codeaurora.org>
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@codeaurora.org>
Reviewed-by: Hongwu Su <hongwus@codeaurora.org>
---
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.
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
next parent reply other threads:[~2020-11-03 6:24 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1604384682-15837-1-git-send-email-cang@codeaurora.org>
2020-11-03 6:24 ` Can Guo [this message]
2020-11-03 7:07 ` [PATCH v1 1/2] scsi: ufs: Fix unbalanced scsi_block_reqs_cnt caused by ufshcd_hold() Stanley Chu
2020-11-03 10:01 ` Can Guo
2020-11-03 14:03 ` Stanley Chu
2020-11-03 15:45 ` [EXT] " Bean Huo (beanhuo)
2020-11-11 17:33 ` Asutosh Das (asd)
2020-11-03 6:24 ` [PATCH v1 2/2] scsi: ufs: Try to save power mode change and UIC cmd completion timeout Can Guo
2020-11-03 7:20 ` Stanley Chu
2020-11-03 8:01 ` Can Guo
2020-11-03 14:12 ` Stanley Chu
2020-11-03 6:24 ` [PATCH] " Can Guo
2020-11-03 6:27 ` Can Guo
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