This patch introduces one module parameter of 'path' in firmware_class
to support customizing firmware image search path, so that people can
use its own firmware path if the default built-in paths can't meet their
demand[1], and the typical usage is passing the below from kernel command
parameter when 'firmware_class' is built in kernel:
firmware_class.path=$CUSTOMIZED_PATH
[1], https://lkml.org/lkml/2012/10/11/337
Cc: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Ming Lei <ming....@canonical.com>
---
V1:
- remove kernel boot parameter and only support the feature by
module parameter as suggested by Greg
Documentation/firmware_class/README | 5 +++++
drivers/base/firmware_class.c | 23 +++++++++++++++++++++--
2 files changed, 26 insertions(+), 2 deletions(-)
diff --git a/Documentation/firmware_class/README
b/Documentation/firmware_class/README
index 815b711..ce02744 100644
--- a/Documentation/firmware_class/README
+++ b/Documentation/firmware_class/README
@@ -22,12 +22,17 @@
- calls request_firmware(&fw_entry, $FIRMWARE, device)
- kernel searchs the fimware image with name $FIRMWARE directly
in the below search path of root filesystem:
+ User customized search path by module parameter 'path'[1]
"/lib/firmware/updates/" UTS_RELEASE,
"/lib/firmware/updates",
"/lib/firmware/" UTS_RELEASE,
"/lib/firmware"
- If found, goto 7), else goto 2)
+ [1], the 'path' is a string parameter which length should be less
+ than 256, user should pass 'firmware.path=$CUSTOMIZED_PATH' if
+ firmware_class is built in kernel(the general situation)
+
2), userspace:
- /sys/class/firmware/xxx/{loading,data} appear.
- hotplug gets called with a firmware identifier in $FIRMWARE
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 8945f4e..b363103 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -274,6 +274,16 @@ static const char *fw_path[] = {
"/lib/firmware"
};
+static char fw_path_para[256];
+
+/*
+ * Typical usage is that passing 'firmware_class.path=$CUSTOMIZED_PATH'
+ * from kernel command because firmware_class is generally built in
+ * kernel instead of module.
+ */
+module_param_string(path, fw_path_para, sizeof(fw_path_para), 0644);
+MODULE_PARM_DESC(path, "customized firmware image search path with a higher
priority than default path");
+
/* Don't inline this: 'struct kstat' is biggish */
static noinline long fw_file_size(struct file *file)
{
@@ -313,9 +323,18 @@ static bool fw_get_filesystem_firmware(struct firmware_buf
*buf)
bool success = false;
char *path = __getname();
- for (i = 0; i < ARRAY_SIZE(fw_path); i++) {
+ for (i = -1; i < ARRAY_SIZE(fw_path); i++) {
struct file *file;
- snprintf(path, PATH_MAX, "%s/%s", fw_path[i], buf->fw_id);
+
+ if (i < 0) {
+ if (!fw_path_para[0]) /* No customized path */
+ continue;
+ snprintf(path, PATH_MAX, "%s/%s", fw_path_para,
+ buf->fw_id);
+ } else {
+ snprintf(path, PATH_MAX, "%s/%s", fw_path[i],
+ buf->fw_id);
+ }
file = filp_open(path, O_RDONLY, 0);
if (IS_ERR(file))
--
1.7.9.5
--
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