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firmware: add firmware_request_nowarn() - load firmware without warnings

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Currently the firmware loader only exposes one silent path for querying
optional firmware, and that is firmware_request_direct(). This function
also disables the sysfs fallback mechanism, which might not always be the
desired behaviour [0].

This patch introduces a variations of request_firmware() that enable the
caller to disable the undesired warning messages but enables the sysfs
fallback mechanism. This is equivalent to adding FW_OPT_NO_WARN to the
old behaviour.

[0]: https://git.kernel.org/linus/c0cc00f250e1

Signed-off-by: Andres Rodriguez <andresx7@gmail.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Luis R. Rodriguez <mcgrof@kernel.org>
[mcgrof: used the old API calls as the full rename is not done yet, and
 add the caller for when FW_LOADER is disabled, enhance documentation ]
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andres Rodriguez
2018-05-10 13:08:45 -07:00
committed by Greg Kroah-Hartman
parent 27d5d7dc9a
commit 7dcc01343e
3 changed files with 42 additions and 0 deletions
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5
Documentation/driver-api/firmware/request_firmware.rst
View File

@@ -20,6 +20,11 @@ request_firmware
.. kernel-doc:: drivers/base/firmware_loader/main.c
:functions: request_firmware
firmware_request_nowarn
-----------------------
.. kernel-doc:: drivers/base/firmware_loader/main.c
:functions: firmware_request_nowarn
request_firmware_direct
-----------------------
.. kernel-doc:: drivers/base/firmware_loader/main.c