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ide: fix races in handling of user-space SET XFER commands

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* 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>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2009-06-23 11:35:51 +00:00 • committed by David S. Miller
parent fa56d4cb40
commit 665d66e8fa
5 changed files with 14 additions and 26 deletions
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3
include/linux/ide.h
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@ -258,6 +258,7 @@ enum {
IDE_TFLAG_DYN = (1 << 5),
IDE_TFLAG_FS = (1 << 6),
IDE_TFLAG_MULTI_PIO = (1 << 7),
IDE_TFLAG_SET_XFER = (1 << 8),
};
enum {
@ -294,7 +295,7 @@ struct ide_cmd {
} out, in;
} valid;
u8 tf_flags;
u16 tf_flags;
u8 ftf_flags; /* for TASKFILE ioctl */
int protocol;