Re: [PATCH] New QStor SATA/RAID Driver for 2.6.9-rc2

[James Bottomley]

On Tue, 2004-09-14 at 14:35, Jeff Garzik wrote:
> The lock is taken in the SCSI layer with spin_lock_irqsave(), but the
> low-level driver cannot perform the exact opposite,
> spin_unlock_irqrestore().  The best they can do is spin_lock_irq(),
> which isnt 100% the same.

That's what they do if you look.

The eh_ stubs are only called from the eh_ thread, so it's safe to
enable interrupts as well.

The business of the mid-layer taking the locks is an annoying holdover
from the "drivers don't need to do locking" mentality.  Unfortunately
most drivers now simply drop the locks immediately they begin an eh_
entry point and reacquire them just prior to returning ... which makes
all the eh code look messy.

James


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/