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| author | Andres Rodriguez <andresx7@gmail.com> | 2018-05-10 13:08:45 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-14 16:44:41 +0200 |
| commit | 7dcc01343e483efda0882456f8361f061a5f416d (patch) | |
| tree | 5c118e816d686682a60890e9443cd5fb9c93faec /drivers | |
| parent | 27d5d7dc9aafd6db3d7aeb49cdbfe578fc1b8663 (diff) | |
| download | linux-7dcc01343e483efda0882456f8361f061a5f416d.tar.bz2 | |
firmware: add firmware_request_nowarn() - load firmware without warnings
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/base/firmware_loader/main.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmware_loader/main.c index abdc4e4d55f1..0943e7065e0e 100644 --- a/drivers/base/firmware_loader/main.c +++ b/drivers/base/firmware_loader/main.c @@ -632,6 +632,33 @@ request_firmware(const struct firmware **firmware_p, const char *name, EXPORT_SYMBOL(request_firmware); /** + * firmware_request_nowarn() - request for an optional fw module + * @firmware: pointer to firmware image + * @name: name of firmware file + * @device: device for which firmware is being loaded + * + * This function is similar in behaviour to request_firmware(), except + * it doesn't produce warning messages when the file is not found. + * The sysfs fallback mechanism is enabled if direct filesystem lookup fails, + * however, however failures to find the firmware file with it are still + * suppressed. It is therefore up to the driver to check for the return value + * of this call and to decide when to inform the users of errors. + **/ +int firmware_request_nowarn(const struct firmware **firmware, const char *name, + struct device *device) +{ + int ret; + + /* Need to pin this module until return */ + __module_get(THIS_MODULE); + ret = _request_firmware(firmware, name, device, NULL, 0, + FW_OPT_UEVENT | FW_OPT_NO_WARN); + module_put(THIS_MODULE); + return ret; +} +EXPORT_SYMBOL_GPL(firmware_request_nowarn); + +/** * request_firmware_direct() - load firmware directly without usermode helper * @firmware_p: pointer to firmware image * @name: name of firmware file |