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SubjectRe: [Regression in 2.6.25-rcX] CD/DVD writer no longer works
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On Sun, 2008-02-24 at 12:57 -0800, zkopex wrote:
> Hello,

Greetings,

> I am using Debian Sid on a Toshiba A100 laptop. My CD/DVD
> writer functions very well on 2.6.23.16 and 2.6.24.2.
>
> I tried 2.6.25-rc2-git7, and I was very sad to notice that
> when I tried to write a CD, wodim started to output the
> following: "Warning: controller returns zero sized CD
> capabilities page."

Yeah, I saw that using k3b.

> Since I was able to use this CD/DVD writer successfully with
> previous versions of Linux, I believe that this is a regression
> in 2.6.25-rcX series.
>
> I am willing to try patches and to do pretty much anything
> to debug/fix this problem.

Sounds like you're having the same problem I am. In my case, reverting
all but one line of commit 6b00769fe1502b4ad97bb327ef7ac971b208bfb5
cures it, though I don't see why.

Revert patch below is against freshly hatched rc3 if you want to try it.

diff --git a/block/blk-core.c b/block/blk-core.c
index 775c851..c013ca2 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -127,7 +127,6 @@ void rq_init(struct request_queue *q, struct request *rq)
rq->nr_hw_segments = 0;
rq->ioprio = 0;
rq->special = NULL;
- rq->raw_data_len = 0;
rq->buffer = NULL;
rq->tag = -1;
rq->errors = 0;
@@ -2016,7 +2015,6 @@ void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
rq->hard_cur_sectors = rq->current_nr_sectors;
rq->hard_nr_sectors = rq->nr_sectors = bio_sectors(bio);
rq->buffer = bio_data(bio);
- rq->raw_data_len = bio->bi_size;
rq->data_len = bio->bi_size;

rq->bio = rq->biotail = bio;
diff --git a/block/blk-map.c b/block/blk-map.c
index 09f7fd0..ae4a0fc 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -19,7 +19,6 @@ int blk_rq_append_bio(struct request_queue *q, struct request *rq,
rq->biotail->bi_next = bio;
rq->biotail = bio;

- rq->raw_data_len += bio->bi_size;
rq->data_len += bio->bi_size;
}
return 0;
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 7506c4f..a15d0ee 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -231,7 +231,6 @@ new_segment:
((unsigned long)q->dma_drain_buffer) &
(PAGE_SIZE - 1));
nsegs++;
- rq->data_len += q->dma_drain_size;
}

if (sg)
diff --git a/block/bsg.c b/block/bsg.c
index 7f3c095..8917c51 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -437,14 +437,14 @@ static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
}

if (rq->next_rq) {
- hdr->dout_resid = rq->raw_data_len;
- hdr->din_resid = rq->next_rq->raw_data_len;
+ hdr->dout_resid = rq->data_len;
+ hdr->din_resid = rq->next_rq->data_len;
blk_rq_unmap_user(bidi_bio);
blk_put_request(rq->next_rq);
} else if (rq_data_dir(rq) == READ)
- hdr->din_resid = rq->raw_data_len;
+ hdr->din_resid = rq->data_len;
else
- hdr->dout_resid = rq->raw_data_len;
+ hdr->dout_resid = rq->data_len;

/*
* If the request generated a negative error number, return it
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index e993cac..9675b34 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -266,7 +266,7 @@ static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
hdr->info = 0;
if (hdr->masked_status || hdr->host_status || hdr->driver_status)
hdr->info |= SG_INFO_CHECK;
- hdr->resid = rq->raw_data_len;
+ hdr->resid = rq->data_len;
hdr->sb_len_wr = 0;

if (rq->sense_len && hdr->sbp) {
@@ -528,7 +528,6 @@ static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
rq = blk_get_request(q, WRITE, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_BLOCK_PC;
rq->data = NULL;
- rq->raw_data_len = 0;
rq->data_len = 0;
rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
memset(rq->cmd, 0, sizeof(rq->cmd));
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 0562b0a..85daaaa 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2539,7 +2539,7 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
* want to set it properly, and for DMA where it is
* effectively meaningless.
*/
- nbytes = min(scmd->request->raw_data_len, (unsigned int)63 * 1024);
+ nbytes = min(qc->nbytes, (unsigned int)63 * 1024);

/* Most ATAPI devices which honor transfer chunk size don't
* behave according to the spec when odd chunk size which
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 6fe67d1..094eba2 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -216,7 +216,6 @@ struct request {
unsigned int cmd_len;
unsigned char cmd[BLK_MAX_CDB];

- unsigned int raw_data_len;
unsigned int data_len;
unsigned int sense_len;
void *data;



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