lkml.org 
[lkml]   [2000]   [Oct]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: Interrupt/Sleep deadlock
Date
In article <Pine.LNX.4.10.10010101035290.24876-100000@main.cyclades.com>,
Ivan Passos <lists@cyclades.com> wrote:
>
>"You could use a semaphore for this. Initialize it to 0, then call
>down() from the ioctl, and up() from the interrupt handler. If the
>up() happens before the down(), the down() won't go to sleep."
>
>Initializing it to 0 means:
>
> cfg_sem = MUTEX_LOCKED;
>
>It's the simplest to understand, and it works great!!
>
>Does anybody see a problem with this implementation??

No.

This is in fact how the SCSI layer has handled similar issues for a
_loong_ time now, so it had better work - and it does.

Linus
-
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 12:39    [W:0.081 / U:4.432 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site