From: Mikulas Patocka Date: Tue, 6 Apr 2010 23:43:33 +0000 (-0700) Subject: ide: Fix IDE taskfile with cfq scheduler X-Git-Tag: firefly_0821_release~9833^2~2023^2~5 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=720fc22a7af79d91ec460c80efa92c65c12d105e;p=firefly-linux-kernel-4.4.55.git ide: Fix IDE taskfile with cfq scheduler When ide taskfile access is being used (for example with hdparm --security commands) and cfq scheduler is selected, the scheduler crashes on BUG in cfq_put_request. The reason is that the cfq scheduler is tracking counts of read and write requests separately; the ide-taskfile subsystem allocates a read request and then flips the flag to make it a write request. The counters in cfq will mismatch. This patch changes ide-taskfile to allocate the READ or WRITE request as required and don't change the flag later. Signed-off-by: Mikulas Patocka Signed-off-by: David S. Miller --- diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c index cc8633cbe133..67fb73559fd5 100644 --- a/drivers/ide/ide-taskfile.c +++ b/drivers/ide/ide-taskfile.c @@ -428,13 +428,11 @@ int ide_raw_taskfile(ide_drive_t *drive, struct ide_cmd *cmd, u8 *buf, { struct request *rq; int error; + int rw = !(cmd->tf_flags & IDE_TFLAG_WRITE) ? READ : WRITE; - rq = blk_get_request(drive->queue, READ, __GFP_WAIT); + rq = blk_get_request(drive->queue, rw, __GFP_WAIT); rq->cmd_type = REQ_TYPE_ATA_TASKFILE; - if (cmd->tf_flags & IDE_TFLAG_WRITE) - rq->cmd_flags |= REQ_RW; - /* * (ks) We transfer currently only whole sectors. * This is suffient for now. But, it would be great,