linux-kernel - [PATCH] firmware loader: don't cancel _nowait requests when helper is not yet available

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Date:	Fri, 9 Mar 2012 23:30:24 +0100
From:	Christian Lamparter <chunkeey@...glemail.com>
To:	linux-kernel@...r.kernel.org
Cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	gregkh@...uxfoundation.org, alan@...rguk.ukuu.org.uk,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux PM mailing list <linux-pm@...r.kernel.org>
Subject: [PATCH] firmware loader: don't cancel _nowait requests when helper is not yet available

This patch fixes a regression which was introduced by:
"PM: Print a warning if firmware is requested when tasks are frozen"

request_firmware_nowait does not stall in any system resume paths.
Therefore, I think it is perfectly save to use request_firmware_nowait
from at least the ->complete() callback.

Signed-off-by: Christian Lamparter <chunkeey@...glemail.com>
---
 drivers/base/firmware_class.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 6c9387d..017e020 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -535,7 +535,7 @@ static int _request_firmware(const struct firmware **firmware_p,
 
 	read_lock_usermodehelper();
 
-	if (WARN_ON(usermodehelper_is_disabled())) {
+	if (WARN_ON(usermodehelper_is_disabled() && !(nowait && uevent))) {
 		dev_err(device, "firmware: %s will not be loaded\n", name);
 		retval = -EBUSY;
 		goto out;
-- 
1.7.9.1

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