From: Bartlomiej Zolnierkiewicz Subject: [PATCH] ide-cd: remove dead post_transform_command() post_transform_command() call in cdrom_newpc_intr() has no effect because it is done after the request has already been fully completed (rq->bio and rq->data are always NULL). It was verified to be true regardless whether INQUIRY command is using DMA or PIO to transfer data (by using modified Tejun Heo's test-shortsg.c utility and adding a few printk()-s to ide-cd). This was uncovered thanks to the "blk_end_request: full I/O completion handler (take 3)" patch series from Kiyoshi Ueda. Cc: jens.axboe@oracle.com Cc: bharrosh@panasas.com Cc: Kiyoshi Ueda Cc: Tejun Heo Acked-by: Sergei Shtylyov Signed-off-by: Bartlomiej Zolnierkiewicz --- Kiyoshi: please rebase your patch on top of this one (I'll send it to Linus in the next IDE update), should make your patch a bit simpler. Tejun: you had really good timing with posting test-shortsg.c (it saved me some time coding user-space SG_IO tester), thanks! drivers/ide/ide-cd.c | 28 ---------------------------- 1 file changed, 28 deletions(-) Index: b/drivers/ide/ide-cd.c =================================================================== --- a/drivers/ide/ide-cd.c +++ b/drivers/ide/ide-cd.c @@ -1650,31 +1650,6 @@ static int cdrom_write_check_ireason(ide return 1; } -static void post_transform_command(struct request *req) -{ - u8 *c = req->cmd; - char *ibuf; - - if (!blk_pc_request(req)) - return; - - if (req->bio) - ibuf = bio_data(req->bio); - else - ibuf = req->data; - - if (!ibuf) - return; - - /* - * set ansi-revision and response data as atapi - */ - if (c[0] == GPCMD_INQUIRY) { - ibuf[2] |= 2; - ibuf[3] = (ibuf[3] & 0xf0) | 2; - } -} - typedef void (xfer_func_t)(ide_drive_t *, void *, u32); /* @@ -1810,9 +1785,6 @@ static ide_startstop_t cdrom_newpc_intr( return ide_started; end_request: - if (!rq->data_len) - post_transform_command(rq); - spin_lock_irqsave(&ide_lock, flags); blkdev_dequeue_request(rq); end_that_request_last(rq, 1);