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scsi: mpt3sas: Fix timeouts observed while reenabling IRQ

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While reenabling the IRQ after irq poll there may be small time window
where HBA firmware has posted some replies and raise the interrupts but
driver has not received the interrupts. So we may observe I/O timeouts as
the driver has not processed the replies as interrupts got missed while
reenabling the IRQ.

To fix this issue the driver has to go for one more round of processing the
reply descriptors from reply descriptor post queue after enabling the IRQ.

Link: https://lore.kernel.org/r/20201102072746.27410-1-sreekanth.reddy@broadcom.com
Reported-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Sreekanth Reddy 2020-11-02 12:57:46 +05:30 committed by Martin K. Petersen
parent 5faf50e9e9
commit 5feed64f91
1 changed files with 7 additions and 0 deletions
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7
drivers/scsi/mpt3sas/mpt3sas_base.c
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@ -1740,6 +1740,13 @@ _base_irqpoll(struct irq_poll *irqpoll, int budget)
reply_q->irq_poll_scheduled = false;
reply_q->irq_line_enable = true;
enable_irq(reply_q->os_irq);
/*
* Go for one more round of processing the
* reply descriptor post queue incase if HBA
* Firmware has posted some reply descriptors
* while reenabling the IRQ.
*/
_base_process_reply_queue(reply_q);
}
return num_entries;