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firmware: enable to force disable the fallback mechanism at run time

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You currently need four different kernel builds to test the firmware
API fully. By adding a proc knob to force disable the fallback mechanism
completely we are able to reduce the amount of kernels you need built
to test the firmware API down to two.

Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Luis R. Rodriguez
2018-03-10 06:14:52 -08:00
committed by Greg Kroah-Hartman
parent ceb1813224
commit 2cd7a1c6dc
3 changed files with 18 additions and 0 deletions
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5
drivers/base/firmware_loader/fallback.c
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@@ -643,6 +643,11 @@ static bool fw_force_sysfs_fallback(unsigned int opt_flags)
static bool fw_run_sysfs_fallback(unsigned int opt_flags)
{
if (fw_fallback_config.ignore_sysfs_fallback) {
pr_info_once("Ignoring firmware sysfs fallback due to debugfs knob\n");
return false;
}
if ((opt_flags & FW_OPT_NOFALLBACK))
return false;