lkml.org 
[lkml]   [2006]   [May]   [29]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: pci_walk_bus race condition
From"Zhang, Yanmin" <>
DateMon, 29 May 2006 16:05:33 +0800
On Mon, 2006-05-29 at 08:41, Zhang, Yanmin wrote:
> On Fri, 2006-05-26 at 21:50, Greg KH wrote:
> > On Fri, May 26, 2006 at 02:35:16PM +0800, Zhang, Yanmin wrote:
> > > pci_walk_bus has a race with pci_destroy_dev. In the while loop,
> > > when the callback function is called, dev pointed by next might be
> > > freed and erased. So later on access to dev might cause kernel panic.
> > 
> > Have you seen this happen?  The only user of this function is the PPC64
> > EEH handler, which last time I checked, didn't run on Intel based
> > processors :)
> I am enabling PCI-Express AER in kernel and want to use it. After
> double-checking, I found the lock is not good.
How about changing pci_bus_lock to a sema? I think it's the thorough
approach. As the write lock is used only when initializing and uninitializing,
the performance won't be hurted severely.

Thanks,
Yanmin
-
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: 2006-05-29 10:12    [from the cache]
©2003-2008