linux-kernel - [PATCH] xen: Remove unnecessary BUG_ON from __unbind_from

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Message-Id: <1529602184-2861-1-git-send-email-boris.ostrovsky@oracle.com>
Date:   Thu, 21 Jun 2018 13:29:44 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Cc:     jgross@...e.com, ben.hutchings@...ethink.co.uk,
        roger.pau@...rix.com, Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        stable@...r.kernel.org
Subject: [PATCH] xen: Remove unnecessary BUG_ON from __unbind_from_irq()

Commit 910f8befdf5b ("xen/pirq: fix error path cleanup when binding
MSIs") fixed a couple of errors in error cleanup path of
xen_bind_pirq_msi_to_irq(). This cleanup allowed a call to
__unbind_from_irq() with an unbound irq, which would result in
triggering the BUG_ON there.

Since there is really no reason for the BUG_ON (xen_free_irq() can
operate on unbound irqs) we can remove it.

Reported-by: Ben Hutchings <ben.hutchings@...ethink.co.uk>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: stable@...r.kernel.org
---
 drivers/xen/events/events_base.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 762378f..08e4af0 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -628,8 +628,6 @@ static void __unbind_from_irq(unsigned int irq)
 		xen_irq_info_cleanup(info);
 	}
 
-	BUG_ON(info_for_irq(irq)->type == IRQT_UNBOUND);
-
 	xen_free_irq(irq);
 }
 
-- 
1.8.3.1