[PATCH 5.12 069/292] scsi: megaraid_sas: Handle missing interrupts while re-enabling IRQs

Greg Kroah-Hartman
2021-07-19T18:00:59Z

From: Chandrakanth Patil <chandrakanth.patil@broadcom.com>

[ Upstream commit 9bedd36e9146b34dda4d6994e3aa1d72bc6442c1 ]

While reenabling the IRQ after IRQ poll there may be a small window for the
firmware to post the replies with interrupts raised. In that case the
driver will not see the interrupts which leads to I/O timeout.

This issue only happens when there are many I/O completions on a single
reply queue. This forces the driver to switch between the interrupt and IRQ
context.

Make the driver process the reply queue one more time after enabling the
IRQ.

Link: https://lore.kernel.org/linux-scsi/20201102072746.27410-1-sreekanth.reddy@broadcom.com/
Link: https://lore.kernel.org/r/20210528131307.25683-5-chandrakanth.patil@broadcom.com
Cc: Tomas Henzl <thenzl@redhat.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Chandrakanth Patil <chandrakanth.patil@broadcom.com>
Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/megaraid/megaraid_sas_fusion.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index 54f8a8073ca0..5abb84ebc0ed 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -3676,6 +3676,7 @@ static void megasas_sync_irqs(unsigned long instance_addr)
if (irq_ctx->irq_poll_scheduled) {
irq_ctx->irq_poll_scheduled = false;
enable_irq(irq_ctx->os_irq);
+ complete_cmd_fusion(instance, irq_ctx->MSIxIndex, irq_ctx);
}
}
}
@@ -3707,6 +3708,7 @@ int megasas_irqpoll(struct irq_poll *irqpoll, int budget)
irq_poll_complete(irqpoll);
irq_ctx->irq_poll_scheduled = false;
enable_irq(irq_ctx->os_irq);
+ complete_cmd_fusion(instance, irq_ctx->MSIxIndex, irq_ctx);
}

return num_entries;
@@ -3723,6 +3725,7 @@ megasas_complete_cmd_dpc_fusion(unsigned long instance_addr)
{
struct megasas_instance *instance =
(struct megasas_instance *)instance_addr;
+ struct megasas_irq_context *irq_ctx = NULL;
u32 count, MSIxIndex;

count = instance->msix_vectors > 0 ? instance->msix_vectors : 1;
@@ -3731,8 +3734,10 @@ megasas_complete_cmd_dpc_fusion(unsigned long instance_addr)
if (atomic_read(&instance->adprecovery) == MEGASAS_HW_CRITICAL_ERROR)
return;

- for (MSIxIndex = 0 ; MSIxIndex < count; MSIxIndex++)
- complete_cmd_fusion(instance, MSIxIndex, NULL);
+ for (MSIxIndex = 0 ; MSIxIndex < count; MSIxIndex++) {
+ irq_ctx = &instance->irq_context[MSIxIndex];
+ complete_cmd_fusion(instance, MSIxIndex, irq_ctx);
+ }
}

/**
--
2.30.2