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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
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7
include/linux/firmware.h
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@ -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