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authorAndres Rodriguez <andresx7@gmail.com>2018-05-10 23:08:45 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-05-14 17:44:41 +0300
commit7dcc01343e483efda0882456f8361f061a5f416d (patch)
tree5c118e816d686682a60890e9443cd5fb9c93faec /drivers/base/firmware_loader
parent27d5d7dc9aafd6db3d7aeb49cdbfe578fc1b8663 (diff)
downloadlinux-7dcc01343e483efda0882456f8361f061a5f416d.tar.xz
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/base/firmware_loader')
-rw-r--r--drivers/base/firmware_loader/main.c27
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