scsi: need to reset unprep_rq_fn in sd_remove

This is for block's for-2.6.36.

We need to reset q->unprep_rq_fn in sd_remove. Otherwise we hit kernel
oops if we access to a scsi disk device via sg after removing scsi
disk module.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index d9a4314a1948..0994ab63b598 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2384,6 +2384,7 @@ static int sd_remove(struct device *dev)
         async_synchronize_full();
         sdkp = dev_get_drvdata(dev);
         blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
+        blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
         device_del(&sdkp->dev);
         del_gendisk(sdkp->disk);
         sd_shutdown(dev);