linux-kernel - [PATCH AUTOSEL 5.7 35/54] scsi: ufs: Improve interrupt handling for shared interrupts

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Date:   Mon, 24 Aug 2020 12:36:14 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Avri Altman <avri.altman@....com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>, linux-scsi@...r.kernel.org
Subject: [PATCH AUTOSEL 5.7 35/54] scsi: ufs: Improve interrupt handling for shared interrupts

From: Adrian Hunter <adrian.hunter@...el.com>

[ 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 <avri.altman@....com>
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/ufs/ufshcd.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index a61f95ffd45fd..93c8d1caeba2b 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -5677,7 +5677,7 @@ static irqreturn_t 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;
@@ -5691,7 +5691,7 @@ 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)
@@ -5700,7 +5700,7 @@ static irqreturn_t ufshcd_intr(int irq, void *__hba)
 			retval |= ufshcd_sl_intr(hba, enabled_intr_status);
 
 		intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
-	} while (intr_status && --retries);
+	}
 
 	if (retval == IRQ_NONE) {
 		dev_err(hba->dev, "%s: Unhandled interrupt 0x%08x\n",
-- 
2.25.1