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ht6560b: fix deadlock on error handling 

Stop abusing ide_lock lock (switch to a private locking).

Fixes same issue as fixed by Alan Cox in atiixp host driver with
commit 6c5f8cc33e.

ht6560b is a bit special cause we still need to leave ide_lock for
->set_pio_mode with 'pio' argument == 8/9 (prefetch disable/enable).

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2007-10-20 00:32:35 +02:00
parent 5bbcf9242d
commit 69e88d2a75
1 changed files with 18 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
drivers/ide/legacy/ht6560b.c
View File

@ -247,6 +247,8 @@ static u8 ht_pio2timings(ide_drive_t *drive, const u8 pio)
}
}
static DEFINE_SPINLOCK(ht6560b_lock);
/*
* Enable/Disable so called prefetch mode
*/
@ -254,9 +256,9 @@ static void ht_set_prefetch(ide_drive_t *drive, u8 state)
{
unsigned long flags;
int t = HT_PREFETCH_MODE << 8;
spin_lock_irqsave(&ide_lock, flags);
spin_lock_irqsave(&ht6560b_lock, flags);
/*
* Prefetch mode and unmask irq seems to conflict
*/
@ -268,9 +270,9 @@ static void ht_set_prefetch(ide_drive_t *drive, u8 state)
drive->drive_data &= ~t; /* disable prefetch mode */
drive->no_unmask = 0;
}
spin_unlock_irqrestore(&ide_lock, flags);
spin_unlock_irqrestore(&ht6560b_lock, flags);
#ifdef DEBUG
printk("ht6560b: drive %s prefetch mode %sabled\n", drive->name, (state ? "en" : "dis"));
#endif
@ -284,19 +286,22 @@ static void ht6560b_set_pio_mode(ide_drive_t *drive, const u8 pio)
switch (pio) {
case 8: /* set prefetch off */
case 9: /* set prefetch on */
/*
* take ide_lock for drive->[no_]unmask
*/
spin_lock_irqsave(&ide_lock, flags);
ht_set_prefetch(drive, pio & 1);
spin_unlock_irqrestore(&ide_lock, flags);
return;
}
timing = ht_pio2timings(drive, pio);
spin_lock_irqsave(&ide_lock, flags);
spin_lock_irqsave(&ht6560b_lock, flags);
drive->drive_data &= 0xff00;
drive->drive_data |= timing;
spin_unlock_irqrestore(&ide_lock, flags);
spin_unlock_irqrestore(&ht6560b_lock, flags);
#ifdef DEBUG
printk("ht6560b: drive %s tuned to pio mode %#x timing=%#x\n", drive->name, pio, timing);
#endif