lkml.org 
[lkml]   [2000]   [Nov]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: PATCH: rd - deadlock removal
On Thu, Nov 09 2000, Neil Brown wrote:
[snip]
> DEADLOCK

> I have two patches which address this problem.
> The first is simple and simply drops ui_request_lock before calling
> getblk. This may be the appropriate one to use given the code
> freeze.

rd still needs to hold the lock when calling end_request, since
that may end up fiddling with the queue list.

> The second is more elegant in that it side steps the problem by
> giving rd.c a make_request function instead of using the default
> _make_request. This means that io_request_lock is simply never
> claimed my rd.

And this solution is much better, even given the freeze I think that
is the way to go.

--
* Jens Axboe <axboe@suse.de>
* SuSE Labs
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:45    [W:0.120 / U:0.744 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site