diff options
| -rw-r--r-- | drivers/ide/pci/piix.c | 12 |
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); } /** |