[PATCH 9/9][RESEND] mvsas: ATAPI lun issue

[Ke Wei <kewei@marvell.com>]

    I found that sending REPORT_LUNS command to some DVD device will cause fis error and controller error record. As a result, scsi mid layer get some wrong LUNs. Also I can get some queer messages.

scsi: host 12 channel 0 id 2 lun 0x30302e302f686f73 has a LUN larger
than currently supported.
scsi: host 12 channel 0 id 2 lun 0x7431322f706f7274 has a LUN larger
than currently supported.
scsi: host 12 channel 0 id 2 lun 0x2d31323a322f656e has a LUN larger
than currently supported.
...

    The patch forced to clear the sg buffer of SATA response if FIS is error. But I suggest these codes should merge to the libsas module.


Signed-off-by: Ke Wei <kewei@marvell.com>
---
 drivers/scsi/mvsas.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/drivers/scsi/mvsas.c b/drivers/scsi/mvsas.c
index e55b903..42f3e90 100644
--- a/drivers/scsi/mvsas.c
+++ b/drivers/scsi/mvsas.c
@@ -1263,8 +1263,14 @@ static int mvs_sata_done(struct mvs_info *mvi, struct sas_task *task,
 	       SATA_RECEIVED_D2H_FIS(port->taskfileset),
 	       sizeof(struct dev_to_host_fis));
 	tstat->buf_valid_size = sizeof(*resp);
-	if (unlikely(err))
+	if (unlikely(err)) {
+		struct scatterlist *sg = task->scatter;
+		u8 *buf;
 		stat = SAS_PROTO_RESPONSE;
+		buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
+		memset(buf, 0, sg->length);
+		kunmap_atomic(buf - sg->offset, KM_IRQ0);
+	}
 	return stat;
 }
 
-- 
1.5.4