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