libata: Initialize qc->pad_len

Initialize qc->pad_len for each new command. This ensures
that pad_len is not set to a stale value for zero data
length commands.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 65d318746ac6..f7f268e38749 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1151,6 +1151,7 @@ static inline void ata_qc_reinit(struct ata_queued_cmd *qc)
         qc->nbytes = qc->curbytes = 0;
         qc->n_elem = 0;
         qc->err_mask = 0;
+        qc->pad_len = 0;
 
         ata_tf_init(qc->dev, &qc->tf);