[PATCH] Fix IDE locking error
This bit us a few kernels ago, and for some reason never made it's way
upstream.
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=144743
Kernel panic - not syncing: drivers/ide/pci/piix.c:231:
spin_lock(drivers/ide/ide.c:c03cef28) already locked by driver/ide/ide-iops.c/1153.
Signed-off-by: Dave Jones <davej@redhat.com>
Cc: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
Cc: Dave Jones <davej@redhat.com>
Cc: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/ide/pci/piix.c b/drivers/ide/pci/piix.c
index e9b83e1..7fac6f5 100644
--- a/drivers/ide/pci/piix.c
+++ b/drivers/ide/pci/piix.c
@@ -222,6 +222,8 @@
unsigned long flags;
u16 master_data;
u8 slave_data;
+ static DEFINE_SPINLOCK(tune_lock);
+
/* ISP RTC */
u8 timings[][2] = { { 0, 0 },
{ 0, 0 },
@@ -230,7 +232,13 @@
{ 2, 3 }, };
pio = ide_get_best_pio_mode(drive, pio, 5, NULL);
- spin_lock_irqsave(&ide_lock, flags);
+
+ /*
+ * Master vs slave is synchronized above us but the slave register is
+ * shared by the two hwifs so the corner case of two slave timeouts in
+ * parallel must be locked.
+ */
+ spin_lock_irqsave(&tune_lock, flags);
pci_read_config_word(dev, master_port, &master_data);
if (is_slave) {
master_data = master_data | 0x4000;
@@ -250,7 +258,7 @@
pci_write_config_word(dev, master_port, master_data);
if (is_slave)
pci_write_config_byte(dev, slave_port, slave_data);
- spin_unlock_irqrestore(&ide_lock, flags);
+ spin_unlock_irqrestore(&tune_lock, flags);
}
/**