ming.lei at canonical
Aug 3, 2012, 9:01 PM
Post #1 of 1
(37 views)
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[RFC PATCH v1 09/15] firmware loader: fix comments on request_firmware_nowait
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request_firmware_nowait is allowed to be called in atomic
context now if @gfp is GFP_ATOMIC, so fix the obsolete
comments and states which situations are suitable for using
it.
Signed-off-by: Ming Lei <ming.lei [at] canonical>
---
drivers/base/firmware_class.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 7d3a83b..a47266c 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -846,9 +846,13 @@ static void request_firmware_work_func(struct work_struct *work)
*
* Caller must hold the reference count of @device.
*
- * 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.
+ * Asynchronous variant of request_firmware() for user contexts:
+ * - sleep for as small periods as possible since it may
+ * increase kernel boot time of built-in device drivers
+ * requesting firmware in their ->probe() methods, if
+ * @gfp is GFP_KERNEL.
+ *
+ * - can't sleep at all if @gfp is GFP_ATOMIC.
**/
int
request_firmware_nowait(
--
1.7.9.5
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