Re: [PATCH v1 2/4] firmware loader: simplify holding module for request_firmware

From: Ming Lei
Date: Tue Jan 07 2014 - 09:54:10 EST

Hi Dmitry,

On Tue, Jan 7, 2014 at 3:56 PM, Dmitry Torokhov
<dmitry.torokhov@xxxxxxxxx> wrote:
> Hi Ming,
> On Thu, Jun 06, 2013 at 08:01:48PM +0800, Ming Lei wrote:
>> module reference doesn't cover direct loading path, so this patch
>> simply holds the module in the whole life time of request_firmware()
>> to fix the problem.
> This does not make sense to me. If request_firmware() is executing that
> means some other module references it and module refcount already
> reflects that.

Yes, you are right, holding this module references in both
request_firmware() and request_firmware_direct() shouldn't
be necessary.

> We needed to pin module before Tejun's work ensuring that currently open
> sysfs entries won't keep related kobjects pinned after kernel marked
> them inactive. We can probably delete __module_get()/module_put() from
> firmware_class.c now.

But holding the reference for request_firmware_nowait() is needed.

Ming Lei
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