linux-kernel - [PATCH 4.19 25/54] firmware_loader: use -ETIMEDOUT instead of -EAGAIN in fw_load_sysfs

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Date:   Tue, 10 Aug 2021 19:30:19 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Anirudh Rayabharam <mail@...rudhrb.com>
Subject: [PATCH 4.19 25/54] firmware_loader: use -ETIMEDOUT instead of -EAGAIN in fw_load_sysfs_fallback

From: Anirudh Rayabharam <mail@...rudhrb.com>

commit 0d6434e10b5377a006f6dd995c8fc5e2d82acddc upstream.

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@...nel.org>
Reviewed-by: Shuah Khan <skhan@...uxfoundation.org>
Acked-by: Luis Chamberlain <mcgrof@...nel.org>
Signed-off-by: Anirudh Rayabharam <mail@...rudhrb.com>
Cc: stable <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/20210728085107.4141-2-mail@anirudhrb.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/base/firmware_loader/fallback.c |    2 --
 1 file changed, 2 deletions(-)

--- a/drivers/base/firmware_loader/fallback.c
+++ b/drivers/base/firmware_loader/fallback.c
@@ -581,8 +581,6 @@ static int fw_load_sysfs_fallback(struct
 	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;