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>
diff --git a/drivers/ide/legacy/ht6560b.c b/drivers/ide/legacy/ht6560b.c
index 7f0d433..4a93adb 100644
--- a/drivers/ide/legacy/ht6560b.c
+++ b/drivers/ide/legacy/ht6560b.c
@@ -247,6 +247,8 @@
}
}
+static DEFINE_SPINLOCK(ht6560b_lock);
+
/*
* Enable/Disable so called prefetch mode
*/
@@ -254,9 +256,9 @@
{
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 @@
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 @@
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
