diff mbox

[v2,04/11] firmware: simplify CONFIG_FW_LOADER_USER_HELPER_FALLBACK further

Message ID 20180224024613.24078-5-mcgrof@kernel.org
State New, archived
Headers show

Commit Message

Luis Chamberlain Feb. 24, 2018, 2:46 a.m. UTC
All CONFIG_FW_LOADER_USER_HELPER_FALLBACK really is, is just a bool,
initailized at build time. Define it as such. This simplifies the
logic even further, removing now all explicit #ifdefs around the code.

Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
---
 drivers/base/firmware_loader.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

Comments

Kees Cook Feb. 27, 2018, 11:20 p.m. UTC | #1
On Fri, Feb 23, 2018 at 6:46 PM, Luis R. Rodriguez <mcgrof@kernel.org> wrote:
> All CONFIG_FW_LOADER_USER_HELPER_FALLBACK really is, is just a bool,
> initailized at build time. Define it as such. This simplifies the
> logic even further, removing now all explicit #ifdefs around the code.

In the next revision, can you mention that struct
firmware_fallback_config is going to grow in future patches. I spent
too long trying to understand why this wasn't just a two line patch
with only IS_ENABLED... added. :)

Acked-by: Kees Cook <keescook@chromium.org>

-Kees

>
> Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
> ---
>  drivers/base/firmware_loader.c | 25 ++++++++++++++++++-------
>  1 file changed, 18 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/base/firmware_loader.c b/drivers/base/firmware_loader.c
> index 7dd36ace6152..59dba794ce1a 100644
> --- a/drivers/base/firmware_loader.c
> +++ b/drivers/base/firmware_loader.c
> @@ -266,6 +266,22 @@ static inline bool fw_state_is_aborted(struct fw_priv *fw_priv)
>
>  #ifdef CONFIG_FW_LOADER_USER_HELPER
>
> +/**
> + * struct firmware_fallback_config - firmware fallback configuratioon settings
> + *
> + * Helps describe and fine tune the fallback mechanism.
> + *
> + * @force_sysfs_fallback: force the sysfs fallback mechanism to be used
> + *     as if one had enabled CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y.
> + */
> +struct firmware_fallback_config {
> +       bool force_sysfs_fallback;
> +};
> +
> +static const struct firmware_fallback_config fw_fallback_config = {
> +       .force_sysfs_fallback = IS_ENABLED(CONFIG_FW_LOADER_USER_HELPER_FALLBACK),
> +};
> +
>  static inline bool fw_sysfs_done(struct fw_priv *fw_priv)
>  {
>         return __fw_state_check(fw_priv, FW_STATUS_DONE);
> @@ -1151,19 +1167,14 @@ static int fw_load_from_user_helper(struct firmware *firmware,
>         return ret;
>  }
>
> -#ifdef CONFIG_FW_LOADER_USER_HELPER_FALLBACK
> -static bool fw_force_sysfs_fallback(unsigned int opt_flags)
> -{
> -       return true;
> -}
> -#else
>  static bool fw_force_sysfs_fallback(unsigned int opt_flags)
>  {
> +       if (fw_fallback_config.force_sysfs_fallback)
> +               return true;
>         if (!(opt_flags & FW_OPT_USERHELPER))
>                 return false;
>         return true;
>  }
> -#endif
>
>  static bool fw_run_sysfs_fallback(unsigned int opt_flags)
>  {
> --
> 2.16.2
>
diff mbox

Patch

diff --git a/drivers/base/firmware_loader.c b/drivers/base/firmware_loader.c
index 7dd36ace6152..59dba794ce1a 100644
--- a/drivers/base/firmware_loader.c
+++ b/drivers/base/firmware_loader.c
@@ -266,6 +266,22 @@  static inline bool fw_state_is_aborted(struct fw_priv *fw_priv)
 
 #ifdef CONFIG_FW_LOADER_USER_HELPER
 
+/**
+ * struct firmware_fallback_config - firmware fallback configuratioon settings
+ *
+ * Helps describe and fine tune the fallback mechanism.
+ *
+ * @force_sysfs_fallback: force the sysfs fallback mechanism to be used
+ * 	as if one had enabled CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y.
+ */
+struct firmware_fallback_config {
+	bool force_sysfs_fallback;
+};
+
+static const struct firmware_fallback_config fw_fallback_config = {
+	.force_sysfs_fallback = IS_ENABLED(CONFIG_FW_LOADER_USER_HELPER_FALLBACK),
+};
+
 static inline bool fw_sysfs_done(struct fw_priv *fw_priv)
 {
 	return __fw_state_check(fw_priv, FW_STATUS_DONE);
@@ -1151,19 +1167,14 @@  static int fw_load_from_user_helper(struct firmware *firmware,
 	return ret;
 }
 
-#ifdef CONFIG_FW_LOADER_USER_HELPER_FALLBACK
-static bool fw_force_sysfs_fallback(unsigned int opt_flags)
-{
-	return true;
-}
-#else
 static bool fw_force_sysfs_fallback(unsigned int opt_flags)
 {
+	if (fw_fallback_config.force_sysfs_fallback)
+		return true;
 	if (!(opt_flags & FW_OPT_USERHELPER))
 		return false;
 	return true;
 }
-#endif
 
 static bool fw_run_sysfs_fallback(unsigned int opt_flags)
 {