| commit | 045707f94023998aa702536bb2fb441d8a049475 | |
| author | Amit Shah <amit.shah@redhat.com> | |
| Wed, 16 Mar 2011 13:42:10 +0000 (16 19:12 +0530) | ||
| committer | Greg Kroah-Hartman <gregkh@suse.de> | |
| Mon, 2 May 2011 16:19:34 +0000 (2 09:19 -0700) | ||
| tree | 5033955a65c6ed6a4e22b59393f2f0505a2d7a3f | treesnapshot (tar.gz zip) |
| parent | eceb743cdc65d1b78d91f786cc2a2acb9ab2d116 | commitdiff |
virtio: Decrement avail idx on buffer detach
commit b3258ff1d6086bd2b9eeb556844a868ad7d49bc8 upstream.
When detaching a buffer from a vq, the avail.idx value should be
decremented as well.
This was noticed by hot-unplugging a virtio console port and then
plugging in a new one on the same number (re-using the vqs which were
just 'disowned'). qemu reported
'Guest moved used index from 0 to 256'
when any IO was attempted on the new port.
Reported-by: juzhang <juzhang@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
commit b3258ff1d6086bd2b9eeb556844a868ad7d49bc8 upstream.
When detaching a buffer from a vq, the avail.idx value should be
decremented as well.
This was noticed by hot-unplugging a virtio console port and then
plugging in a new one on the same number (re-using the vqs which were
just 'disowned'). qemu reported
'Guest moved used index from 0 to 256'
when any IO was attempted on the new port.
Reported-by: juzhang <juzhang@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| drivers/virtio/virtio_ring.c | diffblobblamehistory |