diff options
author | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2009-06-23 13:35:51 +0200 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2009-08-07 19:43:00 +0200 |
commit | 665d66e8fad60a5a162c4615f27f916ad1a6d567 (patch) | |
tree | 2e4f699f4fec1ca4010a39b9dd787fbd5f03b44d /drivers | |
parent | ide: allow ide_dev_read_id() to be called from the IRQ context (diff) | |
download | linux-665d66e8fad60a5a162c4615f27f916ad1a6d567.tar.xz linux-665d66e8fad60a5a162c4615f27f916ad1a6d567.zip |
ide: fix races in handling of user-space SET XFER commands
* Make cmd->tf_flags field 'u16' and add IDE_TFLAG_SET_XFER taskfile flag.
* Update ide_finish_cmd() to set xfer / re-read id if the new flag is set.
* Convert set_xfer_rate() (write handler for /proc/ide/hd?/current_speed)
and ide_cmd_ioctl() (HDIO_DRIVE_CMD ioctl handler) to use the new flag.
* Remove no longer needed disable_irq_nosync() + enable_irq() from
ide_config_drive_speed().
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/ide/ide-ioctls.c | 8 | ||||
-rw-r--r-- | drivers/ide/ide-iops.c | 10 | ||||
-rw-r--r-- | drivers/ide/ide-proc.c | 10 | ||||
-rw-r--r-- | drivers/ide/ide-taskfile.c | 9 |
4 files changed, 12 insertions, 25 deletions
diff --git a/drivers/ide/ide-ioctls.c b/drivers/ide/ide-ioctls.c index e246d3d3fbcc..d3440b5010a5 100644 --- a/drivers/ide/ide-ioctls.c +++ b/drivers/ide/ide-ioctls.c @@ -167,6 +167,8 @@ static int ide_cmd_ioctl(ide_drive_t *drive, unsigned long arg) err = -EINVAL; goto abort; } + + cmd.tf_flags |= IDE_TFLAG_SET_XFER; } err = ide_raw_taskfile(drive, &cmd, buf, args[3]); @@ -174,12 +176,6 @@ static int ide_cmd_ioctl(ide_drive_t *drive, unsigned long arg) args[0] = tf->status; args[1] = tf->error; args[2] = tf->nsect; - - if (!err && xfer_rate) { - /* active-retuning-calls future */ - ide_set_xfer_rate(drive, xfer_rate); - ide_driveid_update(drive); - } abort: if (copy_to_user((void __user *)arg, &args, 4)) err = -EFAULT; diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c index b99873845d21..b14fa9a87c49 100644 --- a/drivers/ide/ide-iops.c +++ b/drivers/ide/ide-iops.c @@ -363,14 +363,6 @@ int ide_config_drive_speed(ide_drive_t *drive, u8 speed) * this point (lost interrupt). */ - /* - * FIXME: we race against the running IRQ here if - * this is called from non IRQ context. If we use - * disable_irq() we hang on the error path. Work - * is needed. - */ - disable_irq_nosync(hwif->irq); - udelay(1); tp_ops->dev_select(drive); SELECT_MASK(drive, 1); @@ -394,8 +386,6 @@ int ide_config_drive_speed(ide_drive_t *drive, u8 speed) SELECT_MASK(drive, 0); - enable_irq(hwif->irq); - if (error) { (void) ide_dump_status(drive, "set_drive_speed_status", stat); return error; diff --git a/drivers/ide/ide-proc.c b/drivers/ide/ide-proc.c index 3242698832a4..021de41655e6 100644 --- a/drivers/ide/ide-proc.c +++ b/drivers/ide/ide-proc.c @@ -195,7 +195,6 @@ ide_devset_get(xfer_rate, current_speed); static int set_xfer_rate (ide_drive_t *drive, int arg) { struct ide_cmd cmd; - int err; if (arg < XFER_PIO_0 || arg > XFER_UDMA_6) return -EINVAL; @@ -206,14 +205,9 @@ static int set_xfer_rate (ide_drive_t *drive, int arg) cmd.tf.nsect = (u8)arg; cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT; cmd.valid.in.tf = IDE_VALID_NSECT; + cmd.tf_flags = IDE_TFLAG_SET_XFER; - err = ide_no_data_taskfile(drive, &cmd); - - if (!err) { - ide_set_xfer_rate(drive, (u8) arg); - ide_driveid_update(drive); - } - return err; + return ide_no_data_taskfile(drive, &cmd); } ide_devset_rw(current_speed, xfer_rate); diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c index 50336d51eebc..cc8633cbe133 100644 --- a/drivers/ide/ide-taskfile.c +++ b/drivers/ide/ide-taskfile.c @@ -324,10 +324,17 @@ static void ide_error_cmd(ide_drive_t *drive, struct ide_cmd *cmd) void ide_finish_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat) { struct request *rq = drive->hwif->rq; - u8 err = ide_read_error(drive); + u8 err = ide_read_error(drive), nsect = cmd->tf.nsect; + u8 set_xfer = !!(cmd->tf_flags & IDE_TFLAG_SET_XFER); ide_complete_cmd(drive, cmd, stat, err); rq->errors = err; + + if (err == 0 && set_xfer) { + ide_set_xfer_rate(drive, nsect); + ide_driveid_update(drive); + } + ide_complete_rq(drive, err ? -EIO : 0, blk_rq_bytes(rq)); } |