From 79e36a9f54aaf4a52eb2d9520953aa3960e99294 Mon Sep 17 00:00:00 2001 From: Elias Oltmanns Date: Wed, 16 Jul 2008 20:33:48 +0200 Subject: IDE: Fix HDIO_DRIVE_RESET handling Currently, the code path executing an HDIO_DRIVE_RESET ioctl is broken in various ways. Most importantly, it is treated as an out of band request in an illegal way which may very likely lead to system lock ups. Use the drive's request queue to avoid this problem (and fix a locking issue for free along the way). Signed-off-by: Elias Oltmanns Cc: "Alan Cox" Cc: "Randy Dunlap" Signed-off-by: Bartlomiej Zolnierkiewicz --- drivers/ide/ide.c | 41 +++++++++++++++-------------------------- 1 file changed, 15 insertions(+), 26 deletions(-) (limited to 'drivers/ide/ide.c') diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c index 90ae00d4aaf..1ec983b0051 100644 --- a/drivers/ide/ide.c +++ b/drivers/ide/ide.c @@ -529,6 +529,19 @@ static int generic_ide_resume(struct device *dev) return err; } +static void generic_drive_reset(ide_drive_t *drive) +{ + struct request *rq; + + rq = blk_get_request(drive->queue, READ, __GFP_WAIT); + rq->cmd_type = REQ_TYPE_SPECIAL; + rq->cmd_len = 1; + rq->cmd[0] = REQ_DRIVE_RESET; + rq->cmd_flags |= REQ_SOFTBARRIER; + blk_execute_rq(drive->queue, NULL, rq, 1); + blk_put_request(rq); +} + int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev, unsigned int cmd, unsigned long arg) { @@ -603,33 +616,9 @@ int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device if (!capable(CAP_SYS_ADMIN)) return -EACCES; - /* - * Abort the current command on the - * group if there is one, taking - * care not to allow anything else - * to be queued and to die on the - * spot if we miss one somehow - */ - - spin_lock_irqsave(&ide_lock, flags); - - if (HWGROUP(drive)->resetting) { - spin_unlock_irqrestore(&ide_lock, flags); - return -EBUSY; - } - - ide_abort(drive, "drive reset"); - - BUG_ON(HWGROUP(drive)->handler); - - /* Ensure nothing gets queued after we - drop the lock. Reset will clear the busy */ - - HWGROUP(drive)->busy = 1; - spin_unlock_irqrestore(&ide_lock, flags); - (void) ide_do_reset(drive); - + generic_drive_reset(drive); return 0; + case HDIO_GET_BUSSTATE: if (!capable(CAP_SYS_ADMIN)) return -EACCES; -- cgit v1.2.3