[PATCH v2] drivers/block/xen-blkback: preq.dev is used without initialized

From: Chen Gang
Date: Wed Feb 27 2013 - 21:34:50 EST

if call xen_vbd_translate failed, the preq.dev will be not initialized.
so use blkif->vbd.pdevice instead (still better to print relative info).

additional information:
before commit 01c681d4c70d64cb72142a2823f27c4146a02e63, the value printed
here was bogus, as it was the guest provided value from req->u.rw.handle
rather than the actual device.

Signed-off-by: Chen Gang <gang.chen@xxxxxxxxxxx>
Acked-by: Jan Beulich <JBeulich@xxxxxxxx>
drivers/block/xen-blkback/blkback.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index de1f319..6d1cc3d 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -904,7 +904,8 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
pr_debug(DRV_PFX "access denied: %s of [%llu,%llu] on dev=%04x\n",
operation == READ ? "read" : "write",
- preq.sector_number + preq.nr_sects, preq.dev);
+ preq.sector_number + preq.nr_sects,
+ blkif->vbd.pdevice);
goto fail_response;

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