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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2007-10-20 00:32:35 +0200
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2007-10-20 00:32:35 +0200
commit69e88d2a754fcaf7ef8ca465586b811cf40dc479 (patch)
tree547d37f38507edf5e94672ef898c2f7757e6ccae /drivers/ide
parent5bbcf9242d4d15027cbee9618fca4b88b7327c28 (diff)
downloadop-kernel-dev-69e88d2a754fcaf7ef8ca465586b811cf40dc479.zip
op-kernel-dev-69e88d2a754fcaf7ef8ca465586b811cf40dc479.tar.gz
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.c31
1 files changed, 18 insertions, 13 deletions
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 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
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