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SubjectRe: regression: disk error loop (panic?) ide_do_rw_disk-bad:
On Wed, Jul 18 2007, Jens Axboe wrote:
> Better still would be to make __ide_end_request() take a byte count
> instead and use end_that_request_chunk(). Then you can get rid of the
> rounding as well.

Ala:

diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index c5b5011..f9de798 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -55,7 +55,7 @@
#include <asm/bitops.h>

static int __ide_end_request(ide_drive_t *drive, struct request *rq,
- int uptodate, int nr_sectors)
+ int uptodate, unsigned int nr_bytes)
{
int ret = 1;

@@ -64,7 +64,7 @@ static int __ide_end_request(ide_drive_t *drive, struct request *rq,
* complete the whole request right now
*/
if (blk_noretry_request(rq) && end_io_error(uptodate))
- nr_sectors = rq->hard_nr_sectors;
+ nr_bytes = rq->hard_nr_sectors << 9;

if (!blk_fs_request(rq) && end_io_error(uptodate) && !rq->errors)
rq->errors = -EIO;
@@ -78,7 +78,7 @@ static int __ide_end_request(ide_drive_t *drive, struct request *rq,
HWGROUP(drive)->hwif->ide_dma_on(drive);
}

- if (!end_that_request_first(rq, uptodate, nr_sectors)) {
+ if (!end_that_request_chunk(rq, uptodate, nr_bytes)) {
add_disk_randomness(rq->rq_disk);
if (!list_empty(&rq->queuelist))
blkdev_dequeue_request(rq);
@@ -103,6 +103,7 @@ static int __ide_end_request(ide_drive_t *drive, struct request *rq,

int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors)
{
+ unsigned int nr_bytes = nr_sectors << 9;
struct request *rq;
unsigned long flags;
int ret = 1;
@@ -114,10 +115,14 @@ int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors)
spin_lock_irqsave(&ide_lock, flags);
rq = HWGROUP(drive)->rq;

- if (!nr_sectors)
- nr_sectors = rq->hard_cur_sectors;
+ if (!nr_bytes) {
+ if (blk_pc_request(rq))
+ nr_bytes = rq->data_len;
+ else
+ nr_bytes = rq->hard_cur_sectors << 9;
+ }

- ret = __ide_end_request(drive, rq, uptodate, nr_sectors);
+ ret = __ide_end_request(drive, rq, uptodate, nr_bytes);

spin_unlock_irqrestore(&ide_lock, flags);
return ret;
--
Jens Axboe

-
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