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firmware: Introduce request_firmware_direct()

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When CONFIG_FW_LOADER_USER_HELPER is set, request_firmware() falls
back to the usermode helper for loading via udev when the direct
loading fails.  But the recent udev takes way too long timeout (60
seconds) for non-existing firmware.  This is unacceptable for the
drivers like microcode loader where they load firmwares optionally,
i.e. it's no error even if no requested file exists.

This patch provides a new helper function, request_firmware_direct().
It behaves as same as request_firmware() except for that it doesn't
fall back to usermode helper but returns an error immediately if the
f/w can't be loaded directly in kernel.

Without CONFIG_FW_LOADER_USER_HELPER=y, request_firmware_direct() is
just an alias of request_firmware(), due to obvious reason.

Tested-by: Prarit Bhargava <prarit@redhat.com>
Acked-by: Ming Lei <ming.lei@canonical.com>
Acked-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Takashi Iwai 2013-12-02 15:38:16 +01:00 committed by Greg Kroah-Hartman
parent 020d30f17f
commit bba3a87e98
2 changed files with 41 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
drivers/base/firmware_class.c
View File

@ -1061,7 +1061,7 @@ static int assign_firmware_buf(struct firmware *fw, struct device *device,
/* called from request_firmware() and request_firmware_work_func() */
static int
_request_firmware(const struct firmware **firmware_p, const char *name,
struct device *device, bool uevent, bool nowait)
struct device *device, bool uevent, bool nowait, bool fallback)
{
struct firmware *fw;
long timeout;
@ -1095,11 +1095,14 @@ _request_firmware(const struct firmware **firmware_p, const char *name,
ret = fw_get_filesystem_firmware(device, fw->priv);
if (ret) {
dev_warn(device, "Direct firmware load failed with error %d\n",
ret);
dev_warn(device, "Falling back to user helper\n");
ret = fw_load_from_user_helper(fw, name, device,
if (fallback) {
dev_warn(device,
"Direct firmware load failed with error %d\n",
ret);
dev_warn(device, "Falling back to user helper\n");
ret = fw_load_from_user_helper(fw, name, device,
uevent, nowait, timeout);
}
}
/* don't cache firmware handled without uevent */
@ -1146,12 +1149,36 @@ request_firmware(const struct firmware **firmware_p, const char *name,
/* Need to pin this module until return */
__module_get(THIS_MODULE);
ret = _request_firmware(firmware_p, name, device, true, false);
ret = _request_firmware(firmware_p, name, device, true, false, true);
module_put(THIS_MODULE);
return ret;
}
EXPORT_SYMBOL(request_firmware);
#ifdef CONFIG_FW_LOADER_USER_HELPER
/**
* request_firmware: - load firmware directly without usermode helper
* @firmware_p: pointer to firmware image
* @name: name of firmware file
* @device: device for which firmware is being loaded
*
* This function works pretty much like request_firmware(), but this doesn't
* fall back to usermode helper even if the firmware couldn't be loaded
* directly from fs. Hence it's useful for loading optional firmwares, which
* aren't always present, without extra long timeouts of udev.
**/
int request_firmware_direct(const struct firmware **firmware_p,
const char *name, struct device *device)
{
int ret;
__module_get(THIS_MODULE);
ret = _request_firmware(firmware_p, name, device, true, false, false);
module_put(THIS_MODULE);
return ret;
}
EXPORT_SYMBOL_GPL(request_firmware_direct);
#endif
/**
* release_firmware: - release the resource associated with a firmware image
* @fw: firmware resource to release
@ -1185,7 +1212,7 @@ static void request_firmware_work_func(struct work_struct *work)
fw_work = container_of(work, struct firmware_work, work);
_request_firmware(&fw, fw_work->name, fw_work->device,
fw_work->uevent, true);
fw_work->uevent, true, true);
fw_work->cont(fw, fw_work->context);
put_device(fw_work->device); /* taken in request_firmware_nowait() */

7
include/linux/firmware.h
View File

@ -68,4 +68,11 @@ static inline void release_firmware(const struct firmware *fw)
#endif
#ifdef CONFIG_FW_LOADER_USER_HELPER
int request_firmware_direct(const struct firmware **fw, const char *name,
struct device *device);
#else
#define request_firmware_direct request_firmware
#endif
#endif