scsi: lpfc: Remove IRQF_ONESHOT flag from threaded IRQ handling

IRQF_ONESHOT is found to mask HBA generated interrupts when thread_fn is
running.  As a result, some EQEs/CQEs miss timely processing resulting in
SCSI layer attempts to abort commands due to io_timeout.  Abort CQEs are
also not processed leading to the observations of hangs and spam of "0748
abort handler timed out waiting for aborting I/O" log messages.

Remove the IRQF_ONESHOT flag.  The cmpxchg and xchg atomic operations on
lpfc_queue->queue_claimed already protect potential parallel access to an
EQ/CQ should the thread_fn get interrupted by the primary irq handler.

Signed-off-by: Justin Tee <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Martin K. Petersen <[email protected]>

Author: Justin Tee

drivers/scsi/lpfc/lpfc_init.c

@@ -13055,7 +13055,7 @@ lpfc_sli4_enable_msix(struct lpfc_hba *phba)
 		rc = request_threaded_irq(eqhdl->irq,
 					  &lpfc_sli4_hba_intr_handler,
 					  &lpfc_sli4_hba_intr_handler_th,
-					  IRQF_ONESHOT, name, eqhdl);
+					  0, name, eqhdl);
 		if (rc) {
 			lpfc_printf_log(phba, KERN_WARNING, LOG_INIT,
 					"0486 MSI-X fast-path (%d) "