lkml.org 
[lkml]   [2006]   [Feb]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Fix IDE locking error.
On 2/16/06, Dave Jones <davej@redhat.com> wrote:
> This bit us a few kernels ago, and for some reason never made it's way
> upstream.

Because has never been submitted...

> 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.

Could we get a decent description of the problem and of the patch?
Starting with the short description: it is piix locking being fixed not IDE one.

As this is piix only patch your bugzilla #144768 is not duplicate of
#144743. Also some people reported the problem for atiixp.c
under #144743 (attixp.c has similar locking problem to piix.c).
So either they didn't care to reopen the bug or it was fixed by
some other change it the core IDE code.

> From: Alan Cox <alan@redhat.com>
> Signed-off-by: Dave Jones <davej@redhat.com>
>
> --- linux-2.6.12/drivers/ide/pci/piix.c~ 2005-07-11 10:23:24.637181320 +0100
> +++ linux-2.6.12/drivers/ide/pci/piix.c 2005-07-11 10:23:24.637181320 +0100
> @@ -203,6 +203,8 @@
> }
> }
>
> +static spinlock_t tune_lock = SPIN_LOCK_UNLOCKED;
> +
> /**
> * piix_tune_drive - tune a drive attached to a PIIX
> * @drive: drive to tune
> @@ -229,7 +231,12 @@
> { 2, 3 }, };
>
> pio = ide_get_best_pio_mode(drive, pio, 5, NULL);
> - spin_lock_irqsave(&ide_lock, flags);
> +
> + /* Master v 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;
> @@ -249,7 +256,7 @@
> 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);
> }
>
> /**
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-02-17 09:59    [W:0.104 / U:0.084 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site