[PATCH] Fix IDE locking error

[linux-2.6] / drivers / ide / pci / piix.c

diff --git a/drivers/ide/pci/piix.c b/drivers/ide/pci/piix.c
index e9b83e1a30287adf49475ab729b95c7b3d4c380c..7fac6f57b5d625aaa3eb0056c6d448149b1eba6c 100644 (file)
--- 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);
 }
 
 /**