Re: [PATCH 11/17] firmware: Load from global search path

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

Hi,

On 10.03.21 14:28, Sascha Hauer wrote:
> We have a global firmware search path, so use it. This removes the
> path argument from of_firmware_load_overlay(). blspec already extends
> the global firmware search path, so the path is not needed there.
> The of_overlay command has an option for specifying the search path,
> this is simply ignored from now on in favour for the global search path.
> 
> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> ---
>  commands/of_overlay.c    | 13 +++++--------
>  common/blspec.c          | 11 +----------
>  drivers/of/of_firmware.c | 25 ++++---------------------
>  include/of.h             |  4 ++--
>  4 files changed, 12 insertions(+), 41 deletions(-)
> 
> diff --git a/commands/of_overlay.c b/commands/of_overlay.c
> index 9a4c008efc..9b1cc6e8c7 100644
> --- a/commands/of_overlay.c
> +++ b/commands/of_overlay.c
> @@ -16,13 +16,12 @@ static int do_of_overlay(int argc, char *argv[])
>  	int opt, ret;
>  	struct fdt_header *fdt;
>  	struct device_node *overlay;
> -	const char *search_path = NULL;
>  	size_t size;
>  
>  	while ((opt = getopt(argc, argv, "S:")) > 0) {
>  		switch (opt) {
>  		case 'S':
> -			search_path = optarg;
> +			/* Ignore for compatibility */

If you really want to maintain compatibility, why don't do a setenv?
Keeping the flag, but ignoring the argument sounds very surprising.

>  			break;
>  		default:
>  			return COMMAND_ERROR_USAGE;
> @@ -43,11 +42,9 @@ static int do_of_overlay(int argc, char *argv[])
>  	if (IS_ERR(overlay))
>  		return PTR_ERR(overlay);
>  
> -	if (search_path) {
> -		ret = of_firmware_load_overlay(overlay, search_path);
> -		if (ret)
> -			goto err;
> -	}
> +	ret = of_firmware_load_overlay(overlay);
> +	if (ret)
> +		goto err;
>  
>  	ret = of_register_overlay(overlay);
>  	if (ret) {
> @@ -64,7 +61,7 @@ err:
>  
>  BAREBOX_CMD_HELP_START(of_overlay)
>  BAREBOX_CMD_HELP_TEXT("Options:")
> -BAREBOX_CMD_HELP_OPT("-S path", "load firmware using this search path")
> +BAREBOX_CMD_HELP_OPT("-S path", "ignored")
>  BAREBOX_CMD_HELP_END
>  
>  BAREBOX_CMD_START(of_overlay)
> diff --git a/common/blspec.c b/common/blspec.c
> index 14e3238c0f..d771176a45 100644
> --- a/common/blspec.c
> +++ b/common/blspec.c
> @@ -39,7 +39,6 @@ static int blspec_apply_oftree_overlay(char *file, const char *abspath,
>  	struct fdt_header *fdt;
>  	struct device_node *overlay;
>  	char *path;
> -	char *firmware_path;
>  	size_t size;
>  
>  	path = basprintf("%s/%s", abspath, file);
> @@ -64,15 +63,7 @@ static int blspec_apply_oftree_overlay(char *file, const char *abspath,
>  		goto out;
>  	}
>  
> -	/*
> -	 * Unfortunately the device tree overlay contains only the filename of
> -	 * the firmware and relies on the firmware search paths to find the
> -	 * actual file. Use /lib/firmware in the Linux root directory and hope
> -	 * for the best.
> -	 */
> -	firmware_path = basprintf("%s/%s", abspath, "/lib/firmware");
> -	ret = of_firmware_load_overlay(overlay, firmware_path);
> -	free(firmware_path);
> +	ret = of_firmware_load_overlay(overlay);
>  	if (ret) {
>  		pr_warn("failed to load firmware: skip overlay \"%s\"\n", path);
>  		of_delete_node(overlay);
> diff --git a/drivers/of/of_firmware.c b/drivers/of/of_firmware.c
> index 096f84572e..12ce1d95d0 100644
> --- a/drivers/of/of_firmware.c
> +++ b/drivers/of/of_firmware.c
> @@ -6,10 +6,6 @@
>  #include <firmware.h>
>  #include <of.h>
>  
> -struct overlay_info {
> -	const char *firmware_path;
> -};
> -
>  static struct firmware_mgr *of_node_get_mgr(struct device_node *np)
>  {
>  	struct device_node *mgr_node;
> @@ -26,12 +22,9 @@ static struct firmware_mgr *of_node_get_mgr(struct device_node *np)
>  }
>  
>  static int load_firmware(struct device_node *target,
> -			 struct device_node *fragment, void *data)
> +			 struct device_node *fragment, void *unused)
>  {
> -	struct overlay_info *info = data;
>  	const char *firmware_name;
> -	const char *firmware_path = info->firmware_path;
> -	char *firmware;
>  	int err;
>  	struct firmware_mgr *mgr;
>  
> @@ -50,22 +43,13 @@ static int load_firmware(struct device_node *target,
>  	if (!mgr)
>  		return -EINVAL;
>  
> -	firmware = basprintf("%s/%s", firmware_path, firmware_name);
> -	if (!firmware)
> -		return -ENOMEM;
> -
> -	err = firmwaremgr_load_file(mgr, firmware);
> -
> -	free(firmware);
> +	err = firmwaremgr_load_file(mgr, firmware_name);
>  
>  	return err;
>  }
>  
> -int of_firmware_load_overlay(struct device_node *overlay, const char *path)
> +int of_firmware_load_overlay(struct device_node *overlay)
>  {
> -	struct overlay_info info = {
> -		.firmware_path = path,
> -	};
>  	int err;
>  	struct device_node *root;
>  	struct device_node *resolved;
> @@ -81,8 +65,7 @@ int of_firmware_load_overlay(struct device_node *overlay, const char *path)
>  	 */
>  	ovl = resolved ? resolved : overlay;
>  
> -	err = of_process_overlay(root, ovl,
> -				 load_firmware, &info);
> +	err = of_process_overlay(root, ovl, load_firmware, NULL);
>  
>  	if (resolved)
>  		of_delete_node(resolved);
> diff --git a/include/of.h b/include/of.h
> index e43e225338..56291b9801 100644
> --- a/include/of.h
> +++ b/include/of.h
> @@ -1033,7 +1033,7 @@ int of_process_overlay(struct device_node *root,
>  				   struct device_node *overlay, void *data),
>  		    void *data);
>  
> -int of_firmware_load_overlay(struct device_node *overlay, const char *path);
> +int of_firmware_load_overlay(struct device_node *overlay);
>  #else
>  static inline struct device_node *of_resolve_phandles(struct device_node *root,
>  					const struct device_node *overlay)
> @@ -1067,7 +1067,7 @@ static inline int of_process_overlay(struct device_node *root,
>  	return -ENOSYS;
>  }
>  
> -static inline int of_firmware_load_overlay(struct device_node *overlay, const char *path)
> +static inline int of_firmware_load_overlay(struct device_node *overlay)
>  {
>  	return -ENOSYS;
>  }
> 

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
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