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>
diff --git a/drivers/ide/ide-proc.c b/drivers/ide/ide-proc.c
index 3242698..021de41 100644
--- a/drivers/ide/ide-proc.c
+++ b/drivers/ide/ide-proc.c
@@ -195,7 +195,6 @@
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 @@
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);