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Subject[PATCH v4 04/15] scsi: ufs: clear outstanding_request bit in case query timeout
Date
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@codeaurora.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 8860a57..e0b8755 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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