lkml.org 
[lkml]   [2003]   [Dec]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: 'bad: scheduling while atomic!', preempt kernel, 2.6.1-test11, reading an apparently duff DVD-R


On Mon, 15 Dec 2003, Toad wrote:
>
> I got the following when trying to mount a particular DVD-R on Linux
> 2.6.0-test11, using an IDE DVD-RW drive, using SCSI emulation, with the
> preempt kernel option enabled, and taskfile I/O:
> (the middle bit was repeated several times):

ide-scsi does

spin_lock_irqsave(&ide_lock, flags);
while (HWGROUP(drive)->handler) {
HWGROUP(drive)->handler = NULL;
schedule_timeout(1);
}

which is obvious crap. Scheduling while holding a spinlock is not a good
idea.

You could try dropping the lock over the schedule and re-aquire it
afterwards, but the comment tries to say that it is required for avoiding
new requests.

This is why ide-scsi needs a maintainer, btw - somebody who cares about
it, and actually tries to resolve the current mess.

Linus
-
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: 2009-11-18 23:46    [W:0.090 / U:1.060 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site