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scsi: ufs: commit descriptors before setting the doorbell
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. Reviewed-by: Dolev Raviv <draviv@codeaurora.org> Signed-off-by: Gilad Broner <gbroner@codeaurora.org> Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org> Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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@ -1625,6 +1625,8 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
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hba->dev_cmd.complete = &wait;
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/* Make sure descriptors are ready before ringing the doorbell */
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wmb();
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spin_lock_irqsave(hba->host->host_lock, flags);
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ufshcd_send_command(hba, tag);
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spin_unlock_irqrestore(hba->host->host_lock, flags);
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