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    SubjectRe: [PATCH ide-dev-2.6] ide: ide_dma_intr oops fix
    On Thu, 03 Mar 2005 15:57:18 +0900, Tejun Heo <htejun@gmail.com> wrote:
    > Hello, Jens.
    >
    > Jens Axboe wrote:
    > > On Thu, Mar 03 2005, Tejun Heo wrote:
    > >
    > >> Hello, Bartlomiej.
    > >>
    > >> This patch fixes ide_dma_intr() oops which occurs for TASKFILE ioctl
    > >>using DMA dataphses. This is against the latest ide-dev-2.6 tree +
    > >>all your recent 9 patches.
    > >>
    > >> Signed-off-by: Tejun Heo <htejun@gmail.com>
    > >>
    > >>Index: linux-taskfile-ng/drivers/ide/ide-dma.c
    > >>===================================================================
    > >>--- linux-taskfile-ng.orig/drivers/ide/ide-dma.c 2005-03-03 11:59:16.485582413 +0900
    > >>+++ linux-taskfile-ng/drivers/ide/ide-dma.c 2005-03-03 12:00:07.753376048 +0900
    > >>@@ -175,10 +175,14 @@ ide_startstop_t ide_dma_intr (ide_drive_
    > >> if (OK_STAT(stat,DRIVE_READY,drive->bad_wstat|DRQ_STAT)) {
    > >> if (!dma_stat) {
    > >> struct request *rq = HWGROUP(drive)->rq;
    > >>- ide_driver_t *drv;
    > >>
    > >>- drv = *(ide_driver_t **)rq->rq_disk->private_data;;
    > >>- drv->end_request(drive, 1, rq->nr_sectors);
    > >>+ if (rq->rq_disk) {
    > >>+ ide_driver_t *drv;
    > >>+
    > >>+ drv = *(ide_driver_t **)rq->rq_disk->private_data;;
    > >>+ drv->end_request(drive, 1, rq->nr_sectors);
    > >>+ } else
    > >>+ ide_end_request(drive, 1, rq->nr_sectors);
    > >> return ide_stopped;
    > >> }
    > >> printk(KERN_ERR "%s: dma_intr: bad DMA status (dma_stat=%x)\n",
    > >
    > > Why not just set rq_disk for taskfile requests as well, seems a lot
    > > cleaner than special casing the end_request handling.
    >
    > Just because other places were fixed this way and the whole drive
    > command issue/completion codes are just about to be restructured. Above
    > code will go away soon. Please consider it a quick fix.
    >
    > Thanks.

    Because struct gendisk is now allocated by device drivers (like in SCSI
    subsystem) rq_disk can't be set for REQ_DRIVE_TASKFILE requests
    (for some requests it can be set but better to keep it consistent).
    -
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