IDE: fix termination of non-fs requests

ide-disk calls

        ide_end_request(drive, 0, 0);

to finish an unknown request, but this doesn't work so well for non-fs
requests, since ide_end_request() internally looks at ->hard_cur_sectors
to see how much data to end. Only file system requests store a transfer
value in there, pc requests fill out ->data_len as a byte based transfer
value instead.

Since we ask to end 0 bytes of that request, it will never be terminated
and ide-disk gets stuck in a loop "handling" that same request over and
over.

Switch __ide_end_request() to take a byte based transfer count, and
adjust ide_end_request() to look at the right field to determine how
much IO to end when it's being passed in 0.

Acked-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Tested-By: Giacomo Catenazzi <cate@debian.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index c5b5011..f9de798 100644 (file)
--- 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;