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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Ben Hutchings <ben.hutchings@codethink.co.uk>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Juergen Gross <jgross@suse.com>
Subject: [PATCH 4.9 092/101] xen: Remove unnecessary BUG_ON from __unbind_from_irq()
Date:   Sun,  1 Jul 2018 18:22:18 +0200
Message-Id: <20180701160800.838487213@linuxfoundation.org>
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4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Boris Ostrovsky <boris.ostrovsky@oracle.com>

commit eef04c7b3786ff0c9cb1019278b6c6c2ea0ad4ff upstream.

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@codethink.co.uk>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: stable@vger.kernel.org
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/xen/events/events_base.c |    2 --
 1 file changed, 2 deletions(-)

--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -637,8 +637,6 @@ static void __unbind_from_irq(unsigned i
 		xen_irq_info_cleanup(info);
 	}
 
-	BUG_ON(info_for_irq(irq)->type == IRQT_UNBOUND);
-
 	xen_free_irq(irq);
 }