From: Adrian Hunter Date: Tue, 11 Aug 2020 13:39:36 +0000 (+0300) Subject: scsi: ufs: Improve interrupt handling for shared interrupts X-Git-Tag: v4.9.235~33 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0ad7639387e55320e59ccc8f0f2fae5518bb787b;p=platform%2Fkernel%2Flinux-amlogic.git scsi: ufs: Improve interrupt handling for shared interrupts [ Upstream commit 127d5f7c4b653b8be5eb3b2c7bbe13728f9003ff ] For shared interrupts, the interrupt status might be zero, so check that first. Link: https://lore.kernel.org/r/20200811133936.19171-2-adrian.hunter@intel.com Reviewed-by: Avri Altman Signed-off-by: Adrian Hunter Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 9916c574e8b8..ad5f2e2b4cba 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -4400,7 +4400,7 @@ static void ufshcd_sl_intr(struct ufs_hba *hba, u32 intr_status) */ static irqreturn_t ufshcd_intr(int irq, void *__hba) { - u32 intr_status, enabled_intr_status; + u32 intr_status, enabled_intr_status = 0; irqreturn_t retval = IRQ_NONE; struct ufs_hba *hba = __hba; int retries = hba->nutrs; @@ -4414,7 +4414,7 @@ static irqreturn_t ufshcd_intr(int irq, void *__hba) * read, make sure we handle them by checking the interrupt status * again in a loop until we process all of the reqs before returning. */ - do { + while (intr_status && retries--) { enabled_intr_status = intr_status & ufshcd_readl(hba, REG_INTERRUPT_ENABLE); if (intr_status) @@ -4425,7 +4425,7 @@ static irqreturn_t ufshcd_intr(int irq, void *__hba) } intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS); - } while (intr_status && --retries); + } spin_unlock(hba->host->host_lock); return retval;