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Message-Id: <1440194989-28835-5-git-send-email-ygardi@codeaurora.org>
Date: Sat, 22 Aug 2015 01:09:38 +0300
From: Yaniv Gardi <ygardi@...eaurora.org>
To: robherring2@...il.com, James.Bottomley@...senPartnership.com,
pebolle@...cali.nl, hch@...radead.org
Cc: linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
linux-arm-msm@...r.kernel.org, santoshsy@...il.com,
linux-scsi-owner@...r.kernel.org, subhashj@...eaurora.org,
ygardi@...eaurora.org, gbroner@...eaurora.org,
draviv@...eaurora.org, Vinayak Holikatti <vinholikatti@...il.com>,
"James E.J. Bottomley" <JBottomley@...n.com>
Subject: [PATCH v1 04/15] scsi: ufs: clear outstanding_request bit in case query timeout
When sending a query to the device returns with a timeout error,
we clear the corresponding bit in the DOORBELL register but
we don't clear the outstanding_request field as we should.
This patch fixes this bug.
Signed-off-by: Yaniv Gardi <ygardi@...eaurora.org>
---
drivers/scsi/ufs/ufshcd.c | 22 ++++++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 61e98a9..c346a300 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -364,6 +364,16 @@ static inline void ufshcd_utrl_clear(struct ufs_hba *hba, u32 pos)
}
/**
+ * ufshcd_outstanding_req_clear - Clear a bit in outstanding request field
+ * @hba: per adapter instance
+ * @tag: position of the bit to be cleared
+ */
+static inline void ufshcd_outstanding_req_clear(struct ufs_hba *hba, int tag)
+{
+ __clear_bit(tag, &hba->outstanding_reqs);
+}
+
+/**
* ufshcd_get_lists_status - Check UCRDY, UTRLRDY and UTMRLRDY
* @reg: Register value of host controller status
*
@@ -1502,9 +1512,17 @@ static int ufshcd_wait_for_dev_cmd(struct ufs_hba *hba,
if (!time_left) {
err = -ETIMEDOUT;
+ dev_dbg(hba->dev, "%s: dev_cmd request timedout, tag %d\n",
+ __func__, lrbp->task_tag);
if (!ufshcd_clear_cmd(hba, lrbp->task_tag))
- /* sucessfully cleared the command, retry if needed */
+ /* successfully cleared the command, retry if needed */
err = -EAGAIN;
+ /*
+ * in case of an error, after clearing the doorbell,
+ * we also need to clear the outstanding_request
+ * field in hba
+ */
+ ufshcd_outstanding_req_clear(hba, lrbp->task_tag);
}
return err;
@@ -3942,7 +3960,7 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
scsi_dma_unmap(cmd);
spin_lock_irqsave(host->host_lock, flags);
- __clear_bit(tag, &hba->outstanding_reqs);
+ ufshcd_outstanding_req_clear(hba, tag);
hba->lrb[tag].cmd = NULL;
spin_unlock_irqrestore(host->host_lock, flags);
--
1.8.5.2
--
QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
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