linux-kernel - Re: [PATCH] firmware: Don't attempt to allocate zero bytes with vmalloc()

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Message-ID: <20121009123629.GB11061@opensource.wolfsonmicro.com>
Date:	Tue, 9 Oct 2012 13:36:29 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] firmware: Don't attempt to allocate zero bytes with
	vmalloc()

On Tue, Oct 09, 2012 at 08:02:18PM +0800, Ming Lei wrote:

> If loading via user space, timeout or not depends on userspace,
> at least udev won't timeout on non-existent firmware image.

This may be a mdev or old udev thing...  it's definitely prevelant.

> Also looks request_firmware_nowait() is better for the case, _nowait()
> can avoid unnecessary delay and speedup firmware loading if there
> are more than one firmware to load.

It doesn't really help as the ABI is such that you can only have one
request_firmware() in play at once (unless this changed since I last
looked at it).
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