[PATCH 4.4 094/105] xen: Remove unnecessary BUG_ON from __unbind_from_irq()

From: Greg Kroah-Hartman
Date: Sun Jul 01 2018 - 12:19:25 EST

4.4-stable review patch. If anyone has any objections, please let me know.


From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>

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@xxxxxxxxxxxxxxx>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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

- BUG_ON(info_for_irq(irq)->type == IRQT_UNBOUND);