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From: Luis Chamberlain <mcgrof@kernel.org>
To: Anirudh Rayabharam <mail@anirudhrb.com>
Cc: gregkh@linuxfoundation.org, rafael@kernel.org,
	skhan@linuxfoundation.org, linux-kernel@vger.kernel.org,
	linux-kernel-mentees@lists.linuxfoundation.org
Subject: Re: [PATCH v7 1/2] firmware_loader: use -ETIMEDOUT instead of -EAGAIN in fw_load_sysfs_fallback
Date: Mon, 26 Jul 2021 11:07:44 -0700	[thread overview]
Message-ID: <20210726180744.crfvxbuyz2bjw2o2@garbanzo> (raw)
In-Reply-To: <20210724121134.6364-2-mail@anirudhrb.com>

On Sat, Jul 24, 2021 at 05:41:33PM +0530, Anirudh Rayabharam wrote:
> The only motivation for using -EAGAIN in commit 0542ad88fbdd81bb
> ("firmware loader: Fix _request_firmware_load() return val for fw load
> abort") was to distinguish the error from -ENOMEM, and so there is no
> real reason in keeping it. -EAGAIN is typically used to tell the
> userspace to try something again and in this case re-using the sysfs
> loading interface cannot be retried when a timeout happens, so the
> return value is also bogus.
> 
> -ETIMEDOUT is received when the wait times out and returning that
> is much more telling of what the reason for the failure was. So, just
> propagate that instead of returning -EAGAIN.
> 
> Suggested-by: Luis Chamberlain <mcgrof@kernel.org>
> Signed-off-by: Anirudh Rayabharam <mail@anirudhrb.com>

Acked-by: Luis Chamberlain <mcgrof@kernel.org>

Beautiful.

As you see, without any of this documented in a commit log, the change
would have been very obscure. Now we cleary document a userspace
changing return value clearly.

Thanks!

  Luis

  parent reply	other threads:[~2021-07-26 18:07 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-24 12:11 [PATCH v7 0/2] firmware_loader: fix uaf in firmware_fallback_sysfs Anirudh Rayabharam
2021-07-24 12:11 ` [PATCH v7 1/2] firmware_loader: use -ETIMEDOUT instead of -EAGAIN in fw_load_sysfs_fallback Anirudh Rayabharam
2021-07-26 16:56   ` Shuah Khan
2021-07-26 18:07   ` Luis Chamberlain [this message]
2021-07-24 12:11 ` [PATCH v7 2/2] firmware_loader: fix use-after-free in firmware_fallback_sysfs Anirudh Rayabharam
2021-07-26 17:22   ` Shuah Khan
2021-07-26 18:27   ` Luis Chamberlain
2021-07-27 12:57     ` Anirudh Rayabharam

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