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[PULL,15/22] s390-ccw.img: Fix sporadic reboot hangs: Initialize next_idx

Message ID 1393579866-43465-16-git-send-email-borntraeger@de.ibm.com
State New
Headers show

Commit Message

Christian Borntraeger Feb. 28, 2014, 9:30 a.m. UTC 
The current code does not initialize next_idx in the virtio ring.
As the ccw bios will always use guest memory at a fixed location,
this queue might != 0 after a reboot.
Lets make the initialization explicit.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
---
 pc-bios/s390-ccw/virtio.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c
index 4d6e48f..a46914d 100644
--- a/pc-bios/s390-ccw/virtio.c
+++ b/pc-bios/s390-ccw/virtio.c
@@ -124,6 +124,7 @@  static void vring_init(struct vring *vr, unsigned int num, void *p,
     vr->used->flags = VRING_USED_F_NO_NOTIFY;
     vr->used->idx = 0;
     vr->used_idx = 0;
+    vr->next_idx = 0;
 
     debug_print_addr("init vr", vr);
 }