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[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>
This commit is contained in:
Alan Cox 2006-06-26 00:26:12 -07:00 committed by Linus Torvalds
parent b5cdccf841
commit 4fb0f76d8c
1 changed files with 10 additions and 2 deletions
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12
drivers/ide/pci/piix.c
View File

@ -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);
}
/**