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From: Anirudh Rayabharam <mail@anirudhrb.com>
To: mcgrof@kernel.org, gregkh@linuxfoundation.org, rafael@kernel.org,
	skhan@linuxfoundation.org
Cc: Anirudh Rayabharam <mail@anirudhrb.com>,
	linux-kernel@vger.kernel.org,
	linux-kernel-mentees@lists.linuxfoundation.org
Subject: [PATCH v7 1/2] firmware_loader: use -ETIMEDOUT instead of -EAGAIN in fw_load_sysfs_fallback
Date: Sat, 24 Jul 2021 17:41:33 +0530	[thread overview]
Message-ID: <20210724121134.6364-2-mail@anirudhrb.com> (raw)
In-Reply-To: <20210724121134.6364-1-mail@anirudhrb.com>

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>
---
 drivers/base/firmware_loader/fallback.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/base/firmware_loader/fallback.c b/drivers/base/firmware_loader/fallback.c
index 91899d185e31..1a48be0a030e 100644
--- a/drivers/base/firmware_loader/fallback.c
+++ b/drivers/base/firmware_loader/fallback.c
@@ -535,8 +535,6 @@ static int fw_load_sysfs_fallback(struct fw_sysfs *fw_sysfs, long timeout)
 	if (fw_state_is_aborted(fw_priv)) {
 		if (retval == -ERESTARTSYS)
 			retval = -EINTR;
-		else
-			retval = -EAGAIN;
 	} else if (fw_priv->is_paged_buf && !fw_priv->data)
 		retval = -ENOMEM;
 
-- 
2.26.2


  reply	other threads:[~2021-07-24 12:12 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 ` Anirudh Rayabharam [this message]
2021-07-26 16:56   ` [PATCH v7 1/2] firmware_loader: use -ETIMEDOUT instead of -EAGAIN in fw_load_sysfs_fallback Shuah Khan
2021-07-26 18:07   ` Luis Chamberlain
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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