diff options
| author | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2007-10-20 00:32:35 +0200 |
|---|---|---|
| committer | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2007-10-20 00:32:35 +0200 |
| commit | 69e88d2a754fcaf7ef8ca465586b811cf40dc479 (patch) | |
| tree | 547d37f38507edf5e94672ef898c2f7757e6ccae /drivers/ide | |
| parent | 5bbcf9242d4d15027cbee9618fca4b88b7327c28 (diff) | |
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 6c5f8cc33eb2e10b6ab788bbe259fc142a068627.
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>
Diffstat (limited to 'drivers/ide')
| -rw-r--r-- | drivers/ide/legacy/ht6560b.c | 31 |
1 files changed, 18 insertions, 13 deletions
diff --git a/drivers/ide/legacy/ht6560b.c b/drivers/ide/legacy/ht6560b.c index 7f0d433cb9d..4a93adbab1d 100644 --- a/drivers/ide/legacy/ht6560b.c +++ b/drivers/ide/legacy/ht6560b.c @@ -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 |