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s390-ccw.img: Enhance drain_irqs().

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- Use tpi + tsch to get interrupts.
- Return an error if the irb indicates problems.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Cornelia Huck 2013-04-26 02:12:53 +00:00 committed by Alexander Graf
parent 22d67ab55a
commit 776e7f0f21
1 changed files with 11 additions and 2 deletions
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13
pc-bios/s390-ccw/virtio.c
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@ -38,12 +38,21 @@ static void virtio_notify(struct subchannel_id schid)
* Virtio functions *
***********************************************/
static void drain_irqs(struct subchannel_id schid)
static int drain_irqs(struct subchannel_id schid)
{
struct irb irb = {};
int r = 0;
while (1) {
/* FIXME: make use of TPI, for that enable subchannel and isc */
if (tsch(schid, &irb)) {
return;
/* Might want to differentiate error codes later on. */
if (irb.scsw.cstat) {
r = -EIO;
} else if (irb.scsw.dstat != 0xc) {
r = -EIO;
}
return r;
}
}
}