Re: [stable] [PATCH] module: drop the lock while waiting for module to complete initialization.

[Greg KH <greg@kroah.com>]

On Tue, Apr 20, 2010 at 06:49:04PM +0930, Rusty Russell wrote:
> This fixes "gave up waiting for init of module libcrc32c." which
> happened at boot time due to multiple parallel module loads.
> 
> The problem was a deadlock: we wait for a module to finish
> initializing, but we keep the module_lock mutex so it can't complete.
> In particular, this could reasonably happen if a module does a
> request_module() in its initialization routine.
> 
> So we change use_module() to return an errno rather than a bool, and if
> it's -EBUSY we drop the lock and wait in the caller, then reaquire the
> lock.
> 
> Reported-by: Brandon Philips <brandon@ifup.org>
> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
> Tested-by: Brandon Philips <brandon@ifup.org>
> ---

If you wish to have patches included "automatically" in the stable
kernel releases, just add:
	Cc: stable <stable@kernel.org>
to the signed-off-by area of your patch.  Then, when the patch goes into
Linus's tree, I get notified of it and can trivially add it to the
proper kernel trees.

Otherwise I need to go dig through git and watch to see if/when the
patch shows up there or not, which takes a lot of time when having to do
it for a lot of patches.

thanks,

greg k-h