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[PATCH] Fix BUG at drivers/scsi/scsi_lib.c:1118 caused by "pktsetup dvd /dev/sr0" 

Fix http://bugzilla.kernel.org/show_bug.cgi?id=7667

This is because the packet driver tries to send down read/write BLOCK_PC
commands that don't use a bio and do not use sg lists.

The right fix is to replace all the packet_command stuff in the packet
driver by scsi_execute() which needs to be lifted from scsi code to
the block code for that.

Fix the bug for now.  It's not the full way to a generic execute block pc
infrastcuture but fixes the bug for the time being.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Peter Osterlund <petero2@telia.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Hellwig 2007-01-05 16:36:26 -08:00 committed by Linus Torvalds
parent d73e3cd73c
commit 406c9b605c
1 changed files with 18 additions and 31 deletions
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49
drivers/block/pktcdvd.c
View File

@ -765,47 +765,34 @@ static inline struct bio *pkt_get_list_first(struct bio **list_head, struct bio
*/
static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc)
{
char sense[SCSI_SENSE_BUFFERSIZE];
request_queue_t *q;
request_queue_t *q = bdev_get_queue(pd->bdev);
struct request *rq;
DECLARE_COMPLETION_ONSTACK(wait);
int err = 0;
int ret = 0;
q = bdev_get_queue(pd->bdev);
rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ?
WRITE : READ, __GFP_WAIT);
if (cgc->buflen) {
if (blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, __GFP_WAIT))
goto out;
}
rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE);
if (sizeof(rq->cmd) > CDROM_PACKET_SIZE)
memset(rq->cmd + CDROM_PACKET_SIZE, 0, sizeof(rq->cmd) - CDROM_PACKET_SIZE);
rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? WRITE : READ,
__GFP_WAIT);
rq->errors = 0;
rq->rq_disk = pd->bdev->bd_disk;
rq->bio = NULL;
rq->buffer = NULL;
rq->timeout = 60*HZ;
rq->data = cgc->buffer;
rq->data_len = cgc->buflen;
rq->sense = sense;
memset(sense, 0, sizeof(sense));
rq->sense_len = 0;
rq->cmd_type = REQ_TYPE_BLOCK_PC;
rq->cmd_flags |= REQ_HARDBARRIER;
if (cgc->quiet)
rq->cmd_flags |= REQ_QUIET;
memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE);
if (sizeof(rq->cmd) > CDROM_PACKET_SIZE)
memset(rq->cmd + CDROM_PACKET_SIZE, 0, sizeof(rq->cmd) - CDROM_PACKET_SIZE);
rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
rq->ref_count++;
rq->end_io_data = &wait;
rq->end_io = blk_end_sync_rq;
elv_add_request(q, rq, ELEVATOR_INSERT_BACK, 1);
generic_unplug_device(q);
wait_for_completion(&wait);
if (rq->errors)
err = -EIO;
blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0);
ret = rq->errors;
out:
blk_put_request(rq);
return err;
return ret;
}
/*