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authorMikulas Patocka <mpatocka@redhat.com>2010-04-07 03:43:33 +0400
committerDavid S. Miller <davem@davemloft.net>2010-04-07 03:43:33 +0400
commit720fc22a7af79d91ec460c80efa92c65c12d105e (patch)
tree87cf610c59bd1f1916083f067145779f31942274 /drivers/ide/ide-taskfile.c
parent1af185034662b75279f90e1c7cb958271d4121e2 (diff)
downloadlinux-720fc22a7af79d91ec460c80efa92c65c12d105e.tar.xz
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 <mpatocka@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/ide/ide-taskfile.c')
-rw-r--r--drivers/ide/ide-taskfile.c6
1 files changed, 2 insertions, 4 deletions
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,