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authorAdrian Hunter <adrian.hunter@intel.com>2020-08-11 16:39:36 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-09-03 12:24:25 +0300
commit31871fb7adca15a0c60e723bad673802ce647932 (patch)
tree9231950d3cf19f10d922290b9406b872d768ed04 /drivers/scsi
parent8f76a208c2f439c02fc5e25fef0790938662e723 (diff)
downloadlinux-31871fb7adca15a0c60e723bad673802ce647932.tar.xz
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 <avri.altman@wdc.com> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/ufs/ufshcd.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 747a2321b5f7..d8c6fd201275 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -5605,7 +5605,7 @@ 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;
@@ -5619,7 +5619,7 @@ 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)
@@ -5630,7 +5630,7 @@ 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;