linux-kernel - [PATCH 5.4 255/355] ibmvnic: Process crqs after enabling interrupts

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Message-Id: <20211115165321.992350844@linuxfoundation.org>
Date:   Mon, 15 Nov 2021 18:02:59 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vaishnavi Bhat <vaish123@...ibm.com>,
        Sukadev Bhattiprolu <sukadev@...ux.ibm.com>,
        Dany Madden <drt@...ux.ibm.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 255/355] ibmvnic: Process crqs after enabling interrupts

From: Sukadev Bhattiprolu <sukadev@...ux.ibm.com>

[ Upstream commit 6e20d00158f31f7631d68b86996b7e951c4451c8 ]

Soon after registering a CRQ it is possible that we get a fail over or
maybe a CRQ_INIT from the VIOS while interrupts were disabled.

Look for any such CRQs after enabling interrupts.

Otherwise we can intermittently fail to bring up ibmvnic adapters during
boot, specially in kexec/kdump kernels.

Fixes: 032c5e82847a ("Driver for IBM System i/p VNIC protocol")
Reported-by: Vaishnavi Bhat <vaish123@...ibm.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.ibm.com>
Reviewed-by: Dany Madden <drt@...ux.ibm.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 059eaa13e2c6d..9adfc0a7ab823 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -4934,6 +4934,9 @@ static int init_crq_queue(struct ibmvnic_adapter *adapter)
 	crq->cur = 0;
 	spin_lock_init(&crq->lock);
 
+	/* process any CRQs that were queued before we enabled interrupts */
+	tasklet_schedule(&adapter->tasklet);
+
 	return retrc;
 
 req_irq_failed:
-- 
2.33.0