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ide-tape: add ide_tape_set_media_lock() helper 

Add ide_tape_set_media_lock() helper and convert idetape_mtioctop(),
idetape_chrdev_open() and idetape_chrdev_release() to use it.

There should be no functional changes caused by this patch (it is
OK to modify ->door_locked if idetape_create_prevent_cmd() fails).

Acked-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2008-10-10 22:39:37 +02:00
parent e996fc8ae9
commit 385a4b8787
1 changed files with 19 additions and 20 deletions
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31
drivers/ide/ide-tape.c
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@ -1299,6 +1299,16 @@ static int idetape_create_prevent_cmd(ide_drive_t *drive,
return 1;
}
static int ide_tape_set_media_lock(ide_drive_t *drive, int on)
{
struct ide_atapi_pc pc;
if (!idetape_create_prevent_cmd(drive, &pc, on))
return 0;
return idetape_queue_pc_tail(drive, &pc);
}
static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
@ -1927,8 +1937,7 @@ static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
* attempting to eject.
*/
if (tape->door_locked) {
if (idetape_create_prevent_cmd(drive, &pc, 0))
if (!idetape_queue_pc_tail(drive, &pc))
if (!ide_tape_set_media_lock(drive, 0))
tape->door_locked = DOOR_UNLOCKED;
}
ide_tape_discard_merge_buffer(drive, 0);
@ -1973,17 +1982,13 @@ static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
case MTFSR:
case MTBSR:
case MTLOCK:
if (!idetape_create_prevent_cmd(drive, &pc, 1))
return 0;
retval = idetape_queue_pc_tail(drive, &pc);
retval = ide_tape_set_media_lock(drive, 1);
if (retval)
return retval;
tape->door_locked = DOOR_EXPLICITLY_LOCKED;
return 0;
case MTUNLOCK:
if (!idetape_create_prevent_cmd(drive, &pc, 0))
return 0;
retval = idetape_queue_pc_tail(drive, &pc);
retval = ide_tape_set_media_lock(drive, 0);
if (retval)
return retval;
tape->door_locked = DOOR_UNLOCKED;
@ -2085,7 +2090,6 @@ static int idetape_chrdev_open(struct inode *inode, struct file *filp)
unsigned int minor = iminor(inode), i = minor & ~0xc0;
ide_drive_t *drive;
idetape_tape_t *tape;
struct ide_atapi_pc pc;
int retval;
if (i >= MAX_HWIFS * MAX_DRIVES)
@ -2148,13 +2152,11 @@ static int idetape_chrdev_open(struct inode *inode, struct file *filp)
/* Lock the tape drive door so user can't eject. */
if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
if (idetape_create_prevent_cmd(drive, &pc, 1)) {
if (!idetape_queue_pc_tail(drive, &pc)) {
if (!ide_tape_set_media_lock(drive, 1)) {
if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
tape->door_locked = DOOR_LOCKED;
}
}
}
unlock_kernel();
return 0;
@ -2185,7 +2187,6 @@ static int idetape_chrdev_release(struct inode *inode, struct file *filp)
{
struct ide_tape_obj *tape = ide_tape_f(filp);
ide_drive_t *drive = tape->drive;
struct ide_atapi_pc pc;
unsigned int minor = iminor(inode);
lock_kernel();
@ -2204,12 +2205,10 @@ static int idetape_chrdev_release(struct inode *inode, struct file *filp)
(void) idetape_rewind_tape(drive);
if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
if (tape->door_locked == DOOR_LOCKED) {
if (idetape_create_prevent_cmd(drive, &pc, 0)) {
if (!idetape_queue_pc_tail(drive, &pc))
if (!ide_tape_set_media_lock(drive, 0))
tape->door_locked = DOOR_UNLOCKED;
}
}
}
clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
ide_tape_put(tape);
unlock_kernel();