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.

Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Reviewed-by: Gilad Broner <gbroner@codeaurora.org>
Reviewed-by: Dolev Raviv <draviv@codeaurora.org>
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 8a34f61..4863e93 100644 (file)
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -363,6 +363,16 @@ static inline void ufshcd_utrl_clear(struct ufs_hba *hba, u32 pos)
        ufshcd_writel(hba, ~(1 << pos), REG_UTP_TRANSFER_REQ_LIST_CLEAR);
 }
 
+/**
+ * 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
@@ -1501,9 +1511,17 @@ 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;
@@ -3941,7 +3959,7 @@ 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);