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s390/cio: fix irq statistics 

When we fetch an interrupt on the CCW console using tsch (via
ccw_device_wait_idle formerly known as wait_cons_dev) we increment
the irq count for the affected interruption class but it is not
accounted as an IO interrupt.

This is broken since commit b603d258a4
"s390: remove superfluous tpi from wait_cons_dev"

Fix it so that the sum of the individual interrupts per class matches
the number of IO interrupts again.

Reported-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2013-04-25 13:01:39 +02:00 committed by Martin Schwidefsky
parent 94c163663f
commit 3ad19b8fb0
1 changed files with 1 additions and 0 deletions
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1
drivers/s390/cio/cio.c
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@ -647,6 +647,7 @@ void cio_tsch(struct subchannel *sch)
local_bh_disable();
irq_enter();
}
kstat_incr_irqs_this_cpu(IO_INTERRUPT, NULL);
if (sch->driver && sch->driver->irq)
sch->driver->irq(sch);
else