libata: Fixup n_elem initialization

Fixup the inialization of qc->n_elem. It currently gets
initialized to 1 for commands that do not transfer any data.
Fix this by initializing n_elem to 0 and only setting to 1
in ata_scsi_qc_new when there is data to transfer. This fixes
some problems seen with SATA devices attached to ipr adapters.

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 e53a13ba7f78..65d318746ac6 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1149,6 +1149,7 @@ static inline void ata_qc_reinit(struct ata_queued_cmd *qc)
         qc->cursect = qc->cursg = qc->cursg_ofs = 0;
         qc->nsect = 0;
         qc->nbytes = qc->curbytes = 0;
+        qc->n_elem = 0;
         qc->err_mask = 0;
 
         ata_tf_init(qc->dev, &qc->tf);