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authorAlan Cox <alan@redhat.com>2006-06-26 00:26:12 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 09:58:27 -0700
commit4fb0f76d8cf4f7a3ffc36dd5e1bc8ca977b68824 (patch)
tree6ba26f667cdddae3aea67253ae6c2fce0c1dffc8
parentb5cdccf841d7d29fb96e03de5a64ed395e0fde61 (diff)
[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>
-rw-r--r--drivers/ide/pci/piix.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/ide/pci/piix.c b/drivers/ide/pci/piix.c
index e9b83e1a302..7fac6f57b5d 100644
--- a/drivers/ide/pci/piix.c
+++ b/drivers/ide/pci/piix.c
@@ -222,6 +222,8 @@ static void piix_tune_drive (ide_drive_t *drive, u8 pio)
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 @@ static void piix_tune_drive (ide_drive_t *drive, u8 pio)
{ 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 @@ static void piix_tune_drive (ide_drive_t *drive, u8 pio)
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);
}
/**