linux-kernel - Re: [PATCH] driver core : fix request_firmware

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Date:	Fri, 29 May 2009 11:33:19 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Greg KH <greg@...ah.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] driver core : fix request_firmware_nowait

On Thu, 28 May 2009 18:43:41 -0700
Greg KH <greg@...ah.com> wrote:
> 
> Anyway, I suggest just fixing the documentation, it's easier :)

Ok, it is the patch which fixes the documentation.
Thanks.

>From 32a1fe6013ed796d397417cc60d5e9a2aa66d74a Mon Sep 17 00:00:00 2001
From: Ming Lei <tom.leiming@...il.com>
Date: Fri, 29 May 2009 11:23:04 +0800
Subject: [PATCH] driver core: fix documentation of request_firmware_nowait

request_firmware_nowait declares it can be called in non-sleep contexts,
but kthead_run called by request_firmware_nowait may sleep. So fix its
documentation and comment to make callers clear about it.

Signed-off-by: Ming Lei <tom.leiming@...il.com>
---
 Documentation/firmware_class/README |    3 ++-
 drivers/base/firmware_class.c       |    5 +++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/Documentation/firmware_class/README b/Documentation/firmware_class/README
index c3480aa..3a37ad3 100644
--- a/Documentation/firmware_class/README
+++ b/Documentation/firmware_class/README
@@ -77,7 +77,8 @@
    seconds for the whole load operation.
 
  - request_firmware_nowait() is also provided for convenience in
-   non-user contexts.
+   user contexts to request firmware asynchronously, but can't be called
+   in atomic contexts.
 
 
  about in-kernel persistence:
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 2d296b7..2427702 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -617,8 +617,9 @@ request_firmware_work_func(void *arg)
  * @cont: function will be called asynchronously when the firmware
  *	request is over.
  *
- *	Asynchronous variant of request_firmware() for contexts where
- *	it is not possible to sleep.
+ *	Asynchronous variant of request_firmware() for user contexts where
+ *	it is not possible to sleep for long time. It can't be called
+ *	in atomic contexts.
  **/
 int
 request_firmware_nowait(
-- 
1.6.0.GIT




-- 
Lei Ming
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