From 363658dad96139188f639c72def9119c643717f1 Mon Sep 17 00:00:00 2001 From: Tomas Henzl Date: Fri, 9 Oct 2020 14:06:35 -0400 Subject: [PATCH 17/33] [scsi] scsi: mpt3sas: Fix sync irqs Message-id: <20201009140636.7976-18-thenzl@redhat.com> Patchwork-id: 330373 Patchwork-instance: patchwork O-Subject: [RHEL8.4 e-stor PATCH 17/18] scsi: mpt3sas: Fix sync irqs Bugzilla: 1851440 RH-Acked-by: Ewan Milne RH-Acked-by: Jarod Wilson RH-Acked-by: Maurizio Lombardi RH-Acked-by: Tony Camuso _base_process_reply_queue() called from _base_interrupt() may schedule a new irq poll. Fix this by calling synchronize_irq() first. Also ensure that enable_irq() is called only when necessary to avoid "Unbalanced enable for IRQ..." errors. Link: https://lore.kernel.org/r/20200910142126.8147-1-thenzl@redhat.com Fixes: 320e77acb327 ("scsi: mpt3sas: Irq poll to avoid CPU hard lockups") Acked-by: Sreekanth Reddy Signed-off-by: Tomas Henzl Signed-off-by: Martin K. Petersen (cherry picked from commit 45181eab8ba79ed7a41b549f00500c0093828521) Signed-off-by: Jan Stancek --- drivers/scsi/mpt3sas/mpt3sas_base.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c index 24dd90a72a80..e08ad13714d4 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_base.c +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c @@ -1809,18 +1809,22 @@ mpt3sas_base_sync_reply_irqs(struct MPT3SAS_ADAPTER *ioc, u8 poll) /* TMs are on msix_index == 0 */ if (reply_q->msix_index == 0) continue; + synchronize_irq(pci_irq_vector(ioc->pdev, reply_q->msix_index)); if (reply_q->irq_poll_scheduled) { /* Calling irq_poll_disable will wait for any pending * callbacks to have completed. */ irq_poll_disable(&reply_q->irqpoll); irq_poll_enable(&reply_q->irqpoll); - reply_q->irq_poll_scheduled = false; - reply_q->irq_line_enable = true; - enable_irq(reply_q->os_irq); - continue; + /* check how the scheduled poll has ended, + * clean up only if necessary + */ + if (reply_q->irq_poll_scheduled) { + reply_q->irq_poll_scheduled = false; + reply_q->irq_line_enable = true; + enable_irq(reply_q->os_irq); + } } - synchronize_irq(pci_irq_vector(ioc->pdev, reply_q->msix_index)); } if (poll) _base_process_reply_queue(reply_q); -- 2.13.6