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authorCornelia Huck <cornelia.huck@de.ibm.com>2015-12-03 17:24:00 +0100
committerMichael S. Tsirkin <mst@redhat.com>2015-12-17 10:37:33 +0200
commit74a599f09bec7419b2490039f0fb33bc8581ef7c (patch)
tree79139da3ddbac8589a09ac124440d2dfeb6f1f31 /drivers/s390/virtio
parentLinux 4.4-rc5 (diff)
downloadlinux-dev-74a599f09bec7419b2490039f0fb33bc8581ef7c.tar.xz
linux-dev-74a599f09bec7419b2490039f0fb33bc8581ef7c.zip
virtio/s390: handle error values in irb
The common I/O layer may pass an error value as the irb in the device's interrupt handler (for classic channel I/O). This won't happen in current virtio-ccw implementations, but it's better to be safe than sorry. Let's just return the error conveyed by the irb and clear any possible pending I/O indications. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Guenther Hutzl <hutzl@linux.vnet.ibm.com> Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/s390/virtio')
-rw-r--r--drivers/s390/virtio/virtio_ccw.c62
1 files changed, 37 insertions, 25 deletions
diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
index b2a1a81e6fc8..1b831598df7c 100644
--- a/drivers/s390/virtio/virtio_ccw.c
+++ b/drivers/s390/virtio/virtio_ccw.c
@@ -984,6 +984,36 @@ static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev,
return vq;
}
+static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev,
+ __u32 activity)
+{
+ if (vcdev->curr_io & activity) {
+ switch (activity) {
+ case VIRTIO_CCW_DOING_READ_FEAT:
+ case VIRTIO_CCW_DOING_WRITE_FEAT:
+ case VIRTIO_CCW_DOING_READ_CONFIG:
+ case VIRTIO_CCW_DOING_WRITE_CONFIG:
+ case VIRTIO_CCW_DOING_WRITE_STATUS:
+ case VIRTIO_CCW_DOING_SET_VQ:
+ case VIRTIO_CCW_DOING_SET_IND:
+ case VIRTIO_CCW_DOING_SET_CONF_IND:
+ case VIRTIO_CCW_DOING_RESET:
+ case VIRTIO_CCW_DOING_READ_VQ_CONF:
+ case VIRTIO_CCW_DOING_SET_IND_ADAPTER:
+ case VIRTIO_CCW_DOING_SET_VIRTIO_REV:
+ vcdev->curr_io &= ~activity;
+ wake_up(&vcdev->wait_q);
+ break;
+ default:
+ /* don't know what to do... */
+ dev_warn(&vcdev->cdev->dev,
+ "Suspicious activity '%08x'\n", activity);
+ WARN_ON(1);
+ break;
+ }
+ }
+}
+
static void virtio_ccw_int_handler(struct ccw_device *cdev,
unsigned long intparm,
struct irb *irb)
@@ -995,6 +1025,12 @@ static void virtio_ccw_int_handler(struct ccw_device *cdev,
if (!vcdev)
return;
+ if (IS_ERR(irb)) {
+ vcdev->err = PTR_ERR(irb);
+ virtio_ccw_check_activity(vcdev, activity);
+ /* Don't poke around indicators, something's wrong. */
+ return;
+ }
/* Check if it's a notification from the host. */
if ((intparm == 0) &&
(scsw_stctl(&irb->scsw) ==
@@ -1010,31 +1046,7 @@ static void virtio_ccw_int_handler(struct ccw_device *cdev,
/* Map everything else to -EIO. */
vcdev->err = -EIO;
}
- if (vcdev->curr_io & activity) {
- switch (activity) {
- case VIRTIO_CCW_DOING_READ_FEAT:
- case VIRTIO_CCW_DOING_WRITE_FEAT:
- case VIRTIO_CCW_DOING_READ_CONFIG:
- case VIRTIO_CCW_DOING_WRITE_CONFIG:
- case VIRTIO_CCW_DOING_WRITE_STATUS:
- case VIRTIO_CCW_DOING_SET_VQ:
- case VIRTIO_CCW_DOING_SET_IND:
- case VIRTIO_CCW_DOING_SET_CONF_IND:
- case VIRTIO_CCW_DOING_RESET:
- case VIRTIO_CCW_DOING_READ_VQ_CONF:
- case VIRTIO_CCW_DOING_SET_IND_ADAPTER:
- case VIRTIO_CCW_DOING_SET_VIRTIO_REV:
- vcdev->curr_io &= ~activity;
- wake_up(&vcdev->wait_q);
- break;
- default:
- /* don't know what to do... */
- dev_warn(&cdev->dev, "Suspicious activity '%08x'\n",
- activity);
- WARN_ON(1);
- break;
- }
- }
+ virtio_ccw_check_activity(vcdev, activity);
for_each_set_bit(i, &vcdev->indicators,
sizeof(vcdev->indicators) * BITS_PER_BYTE) {
/* The bit clear must happen before the vring kick. */