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[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>
This commit is contained in:
James Bottomley 2007-04-06 11:14:56 -05:00 committed by James Bottomley
parent 8a065975c1
commit 6e3b2bbb19
1 changed files with 9 additions and 2 deletions
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11
drivers/scsi/3w-xxxx.c
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@ -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);