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authorJames Bottomley <James.Bottomley@steeleye.com>2007-04-06 11:14:56 -0500
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2007-04-14 08:49:03 -0500
commit6e3b2bbb197eb12b2bef35bcf2ac3bd6a5facab2 (patch)
tree2c10a0967b6843a60b76c687750df839b56316b1
parent8a065975c1c00d1ab3293c1adf6f89988bb1b03b (diff)
downloadlinux-sh-6e3b2bbb197eb12b2bef35bcf2ac3bd6a5facab2.tar.gz
[SCSI] 3w-xxxx: fix oops caused by incorrect REQUEST_SENSE handling
3w-xxxx emulates a REQUEST_SENSE response by simply returning nothing. Unfortunately, it's assuming that the REQUEST_SENSE command is implemented with use_sg == 0, which is no longer the case. The oops occurs because it's clearing the scatterlist in request_buffer instead of the memory region. This is fixed by using tw_transfer_internal() to transfer correctly to the scatterlist. Acked-by: adam radford <aradford@gmail.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
-rw-r--r--drivers/scsi/3w-xxxx.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/scsi/3w-xxxx.c b/drivers/scsi/3w-xxxx.c
index bf5d63e1beee..656bdb1352d8 100644
--- a/drivers/scsi/3w-xxxx.c
+++ b/drivers/scsi/3w-xxxx.c
@@ -1864,10 +1864,17 @@ static int tw_scsiop_read_write(TW_Device_Extension *tw_dev, int request_id)
/* This function will handle the request sense scsi command */
static int tw_scsiop_request_sense(TW_Device_Extension *tw_dev, int request_id)
{
+ char request_buffer[18];
+
dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_request_sense()\n");
- /* For now we just zero the request buffer */
- memset(tw_dev->srb[request_id]->request_buffer, 0, tw_dev->srb[request_id]->request_bufflen);
+ memset(request_buffer, 0, sizeof(request_buffer));
+ request_buffer[0] = 0x70; /* Immediate fixed format */
+ request_buffer[7] = 10; /* minimum size per SPC: 18 bytes */
+ /* leave all other fields zero, giving effectively NO_SENSE return */
+ tw_transfer_internal(tw_dev, request_id, request_buffer,
+ sizeof(request_buffer));
+
tw_dev->state[request_id] = TW_S_COMPLETED;
tw_state_request_finish(tw_dev, request_id);