Messages in this thread Patch in this message | | | From | Yaniv Gardi <> | Subject | [PATCH v5 14/15] scsi: ufs: commit descriptors before setting the doorbell | Date | Tue, 27 Oct 2015 12:44:16 +0200 |
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Add a write memory barrier to make sure descriptors prepared are actually written to memory before ringing the doorbell. We have also added the write memory barrier after ringing the doorbell register so that controller sees the new request immediately.
Signed-off-by: Gilad Broner <gbroner@codeaurora.org> Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org> Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
--- drivers/scsi/ufs/ufshcd.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index dfc4ac1..ec90504 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -1628,6 +1628,8 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba, hba->dev_cmd.complete = &wait; + /* Make sure descriptors are ready before ringing the doorbell */ + wmb(); spin_lock_irqsave(hba->host->host_lock, flags); ufshcd_send_command(hba, tag); spin_unlock_irqrestore(hba->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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