[lkml]   [2002]   [May]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] 2.5.15 IDE 62
On Mon, May 13 2002, Linus Torvalds wrote:
> > Well on the channel level they are safe modulo cmd640 and rz1000.
> > We can handle them by serializing them on the global lock
> > in do_ide_request. Like:
> >
> > if (ch->drive[0].serialized|| ch->drive[1].serialized)
> > then
> > spin_lock(serialize_lock);
> NO.
> The whole point of having a per-queue lock pointer is that this should be
> initialized at queue creation time. Don't add more crud to the IDE
> locking, we want to get _rid_ of the locking that IDE has thought
> (traditionally incorrectly) that it could do better than the higher
> levels.
> So when you create the queue, you should decide at THAT point whether you
> just want to pass in the same lock or not.
> For a cmd640, you make sure that both queues get created with the same
> lock. And for non-broken chipsets, you use per-queue locks.
> And then you make sure that nobody EVER uses any other lock than the queue
> lock.

Completely agreed. And when we finally use the queue as the
serialization point for "everything", then it all falls into place

Jens Axboe

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:26    [W:0.179 / U:0.324 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site