[PATCH 2/7] 3w-xxxx: fix transfer length 0 for 6-byte r/w commands

[Akinobu Mita <akinobu.mita@gmail.com>]

For 6-byte r/w commands, transfer length 0 means 256 blocks of data,
not 0 block.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Adam Radford <linuxraid@lsi.com>
Cc: linux-scsi@vger.kernel.org
---
 drivers/scsi/3w-xxxx.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/scsi/3w-xxxx.c b/drivers/scsi/3w-xxxx.c
index 2940bd7..e836aee 100644
--- a/drivers/scsi/3w-xxxx.c
+++ b/drivers/scsi/3w-xxxx.c
@@ -1727,6 +1727,8 @@ static int tw_scsiop_read_write(TW_Device_Extension *tw_dev, int request_id)
 	if (srb->cmnd[0] == READ_6 || srb->cmnd[0] == WRITE_6) {
 		lba = ((u32)srb->cmnd[1] << 16) | ((u32)srb->cmnd[2] << 8) | (u32)srb->cmnd[3];
 		num_sectors = (u32)srb->cmnd[4];
+		if (num_sectors == 0)
+			num_sectors = 256;
 	} else {
 		lba = ((u32)srb->cmnd[2] << 24) | ((u32)srb->cmnd[3] << 16) | ((u32)srb->cmnd[4] << 8) | (u32)srb->cmnd[5];
 		num_sectors = (u32)srb->cmnd[8] | ((u32)srb->cmnd[7] << 8);
-- 
1.9.1