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@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 5 insertions, 3 deletions

diff --git a/Documentation/firmware_class/README b/Documentation/firmware_class/README
index c3480aa66ba8..7eceaff63f5f 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 2d296b7f7034..242770250584 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(