diff options
| author | Luis R. Rodriguez <mcgrof@kernel.org> | 2018-03-10 06:14:51 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-03-20 09:28:47 +0100 |
| commit | ceb18132248d95b2c68e30c3df78e69175c4452f (patch) | |
| tree | 8b6712a080bfa43a383e0e2fde7d62cc2108ca03 /drivers/base/firmware_loader | |
| parent | 5d6d1ddd27301dc85b13b794262c8bcececf88f1 (diff) | |
firmware: enable run time change of forcing fallback loader
Currently one requires to test four kernel configurations to test the
firmware API completely:
0)
CONFIG_FW_LOADER=y
1)
o CONFIG_FW_LOADER=y
o CONFIG_FW_LOADER_USER_HELPER=y
2)
o CONFIG_FW_LOADER=y
o CONFIG_FW_LOADER_USER_HELPER=y
o CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y
3) When CONFIG_FW_LOADER=m the built-in stuff is disabled, we have
no current tests for this.
We can reduce the requirements to three kernel configurations by making
fw_config.force_sysfs_fallback a proc knob we flip on off. For kernels that
disable CONFIG_IKCONFIG_PROC this can also enable one to inspect if
CONFIG_FW_LOADER_USER_HELPER_FALLBACK was enabled at build time by checking
the proc value at boot time.
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>
Diffstat (limited to 'drivers/base/firmware_loader')
| -rw-r--r-- | drivers/base/firmware_loader/fallback.c | 1 | ||||
| -rw-r--r-- | drivers/base/firmware_loader/fallback.h | 4 | ||||
| -rw-r--r-- | drivers/base/firmware_loader/fallback_table.c | 17 |
3 files changed, 21 insertions, 1 deletions
diff --git a/drivers/base/firmware_loader/fallback.c b/drivers/base/firmware_loader/fallback.c index 9b65837256d6..45cc40933a47 100644 --- a/drivers/base/firmware_loader/fallback.c +++ b/drivers/base/firmware_loader/fallback.c @@ -7,6 +7,7 @@ #include <linux/security.h> #include <linux/highmem.h> #include <linux/umh.h> +#include <linux/sysctl.h> #include "fallback.h" #include "firmware.h" diff --git a/drivers/base/firmware_loader/fallback.h b/drivers/base/firmware_loader/fallback.h index 550498c7fa4c..ca7e69a8417b 100644 --- a/drivers/base/firmware_loader/fallback.h +++ b/drivers/base/firmware_loader/fallback.h @@ -12,12 +12,14 @@ * * @force_sysfs_fallback: force the sysfs fallback mechanism to be used * as if one had enabled CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y. + * Useful to help debug a CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y + * functionality on a kernel where that config entry has been disabled. * @old_timeout: for internal use * @loading_timeout: the timeout to wait for the fallback mechanism before * giving up, in seconds. */ struct firmware_fallback_config { - const bool force_sysfs_fallback; + unsigned int force_sysfs_fallback; int old_timeout; int loading_timeout; }; diff --git a/drivers/base/firmware_loader/fallback_table.c b/drivers/base/firmware_loader/fallback_table.c index 981419044c7e..92365e053e30 100644 --- a/drivers/base/firmware_loader/fallback_table.c +++ b/drivers/base/firmware_loader/fallback_table.c @@ -19,6 +19,9 @@ /* Module or buit-in */ #ifdef CONFIG_FW_LOADER_USER_HELPER +static unsigned int zero; +static unsigned int one = 1; + struct firmware_fallback_config fw_fallback_config = { .force_sysfs_fallback = IS_ENABLED(CONFIG_FW_LOADER_USER_HELPER_FALLBACK), .loading_timeout = 60, @@ -26,4 +29,18 @@ struct firmware_fallback_config fw_fallback_config = { }; EXPORT_SYMBOL_GPL(fw_fallback_config); +struct ctl_table firmware_config_table[] = { + { + .procname = "force_sysfs_fallback", + .data = &fw_fallback_config.force_sysfs_fallback, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_douintvec_minmax, + .extra1 = &zero, + .extra2 = &one, + }, + { } +}; +EXPORT_SYMBOL_GPL(firmware_config_table); + #endif |