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Date: Wed, 5 Jun 2013 18:28:46 +0800
From: Ming Lei <ming.lei@...onical.com>
To: Takashi Iwai <tiwai@...e.de>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org,
Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 3/3] firmware loader: allow distribution to choose default
search paths
Hi,
On Wed, Jun 5, 2013 at 5:35 PM, Ming Lei <ming.lei@...onical.com> wrote:
>
> Looks we can let fw_get_fw_file_from_paths() handle all
> predefined paths(CONFIG_FW_CUSTOMIZED_PATH and
> kernel built-in paths), then fw_get_filesystem_firmware()
> may become simple, just check fw_path_para and all
> other paths by fw_get_fw_file_from_paths(). How about the
> idea?
So follows the revised patch for review, which should be cleaner
than before, :-)
Any comments?
---
drivers/base/Kconfig | 14 +++++++
drivers/base/firmware_class.c | 87 +++++++++++++++++++++++++++++------------
2 files changed, 76 insertions(+), 25 deletions(-)
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index 07abd9d..b66e63e 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -156,6 +156,20 @@ config FW_LOADER_USER_HELPER
no longer required unless you have a special firmware file that
resides in a non-standard path.
+config FW_CUSTOMIZED_PATH
+ string "default firmware search paths for direct loading"
+ help
+ On some distribution(e.g. android), firmware images aren't
+ put under kernel built-in search paths, so provide this option
+ for distributions to choose a distribution specific firmware
+ search path. The option allows to choose more than one path,
+ and paths are seperated with semicolon(e.g. on android, the
+ option might look as "/etc/firmware;/vendor/firmware"). Each
+ path should be a absolute path, and relative path will be
+ ignored.
+
+ If you are unsure about this, don't choose here.
+
config DEBUG_DRIVER
bool "Driver Core verbose debug messages"
depends on DEBUG_KERNEL
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index c743409..218dc1b 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -265,13 +265,14 @@ static void fw_free_buf(struct firmware_buf *buf)
/* direct firmware loading support */
static char fw_path_para[256];
-static const char * const fw_path[] = {
- fw_path_para,
- "/lib/firmware/updates/" UTS_RELEASE,
- "/lib/firmware/updates",
- "/lib/firmware/" UTS_RELEASE,
- "/lib/firmware"
-};
+static const char * const fw_paths =
+#ifdef CONFIG_FW_CUSTOMIZED_PATH
+ CONFIG_FW_CUSTOMIZED_PATH ";"
+#endif
+ "/lib/firmware/updates/" UTS_RELEASE ";"
+ "/lib/firmware/updates;"
+ "/lib/firmware/" UTS_RELEASE ";"
+ "/lib/firmware";
/*
* Typical usage is that passing 'firmware_class.path=$CUSTOMIZED_PATH'
@@ -314,30 +315,66 @@ static bool fw_read_file_contents(struct file
*file, struct firmware_buf *fw_buf
return true;
}
-static bool fw_get_filesystem_firmware(struct device *device,
- struct firmware_buf *buf)
+static bool fw_get_file_firmware(const char *path,
+ struct firmware_buf *buf)
{
- int i;
- bool success = false;
- char *path = __getname();
+ struct file *file;
+ bool success;
+
+ file = filp_open(path, O_RDONLY, 0);
+ if (IS_ERR(file))
+ return false;
+ success = fw_read_file_contents(file, buf);
+ fput(file);
- for (i = 0; i < ARRAY_SIZE(fw_path); i++) {
- struct file *file;
+ return success;
+}
- /* skip the unset customized path */
- if (!fw_path[i][0])
- continue;
+/* The path in @paths is seperated by ';' */
+static bool fw_get_fw_file_from_paths(const char *paths, char *path,
+ struct firmware_buf *buf)
+{
+ int len, start, end = -1;
+ char *pos;
+
+ if (!paths[0])
+ return false;
- snprintf(path, PATH_MAX, "%s/%s", fw_path[i], buf->fw_id);
+ do {
+ start = end + 1;
+ pos = strchr(&paths[start], ';');
+ if (pos) {
+ end = (int)(pos - paths);
+ len = end - start;
+ } else {
+ len = strlen(&paths[start]);
+ }
- file = filp_open(path, O_RDONLY, 0);
- if (IS_ERR(file))
+ if (len <= 0 || PATH_MAX < len + strlen(buf->fw_id))
continue;
- success = fw_read_file_contents(file, buf);
- fput(file);
- if (success)
- break;
- }
+ strncpy(path, &paths[start], len);
+ snprintf(&path[len], PATH_MAX - len, "/%s", buf->fw_id);
+ /* don't search relative path */
+ if (strstr(path, ".."))
+ continue;
+
+ if (fw_get_file_firmware(path, buf))
+ return true;
+ } while (pos && end < strlen(paths) - 1);
+
+ return false;
+}
+
+static bool fw_get_filesystem_firmware(struct device *device,
+ struct firmware_buf *buf)
+{
+ bool success = false;
+ char *path = __getname();
+
+ /* search runtime paths first, then static pre-defined paths */
+ success = fw_get_fw_file_from_paths(fw_path_para, path, buf);
+ if (!success)
+ success = fw_get_fw_file_from_paths(fw_paths, path, buf);
__putname(path);
if (success) {
--
1.7.9.5
Thanks,
--
Ming Lei
--
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