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firmware loader: document firmware cache mechanism

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This patch documents the firmware cache mechanism so that
users of request_firmware() know that it can be called
safely inside device's suspend and resume callback, and
the device's firmware needn't be cached any more by individual
driver itself to deal with firmware loss during system resume.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ming Lei 2012-11-03 17:48:16 +08:00 committed by Greg Kroah-Hartman
parent 2760284206
commit 6a927857d8
2 changed files with 10 additions and 0 deletions
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7
Documentation/firmware_class/README
View File

@ -119,3 +119,10 @@
on the setup, so I think that the choice on what firmware to make
persistent should be left to userspace.
about firmware cache:
--------------------
After firmware cache mechanism is introduced during system sleep,
request_firmware can be called safely inside device's suspend and
resume callback, and callers need't cache the firmware by
themselves any more for dealing with firmware loss during system
resume.

3
drivers/base/firmware_class.c
View File

@ -988,6 +988,9 @@ err_put_dev:
* firmware image for this or any other device.
*
* Caller must hold the reference count of @device.
*
* The function can be called safely inside device's suspend and
* resume callback.
**/
int
request_firmware(const struct firmware **firmware_p, const char *name,