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scsi: ufs: Improve interrupt handling for shared interrupts 

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@wdc.com>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
zero-sugar-mainline-defconfig
Adrian Hunter 2020-08-11 16:39:36 +03:00 committed by Martin K. Petersen
parent 6337f58cec
commit 127d5f7c4b
1 changed files with 3 additions and 3 deletions
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6
drivers/scsi/ufs/ufshcd.c
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@ -5944,7 +5944,7 @@ 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;
@ -5958,7 +5958,7 @@ 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)
@ -5967,7 +5967,7 @@ 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 (enabled_intr_status && retval == IRQ_NONE) {
dev_err(hba->dev, "%s: Unhandled interrupt 0x%08x\n",