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| author | Ming Lei <ming.lei@canonical.com> | 2012-11-03 17:47:58 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-11-14 15:07:18 -0800 |
| commit | 27602842060484b564cd725241b402b0bddfb830 (patch) | |
| tree | 62bc5aa301675cde89a7543d169b38e62df1bcd3 /drivers/base/firmware_class.c | |
| parent | 60dac5e284fe99751e3beefe1a9cc7a0771ad73c (diff) | |
| download | linux-27602842060484b564cd725241b402b0bddfb830.tar.bz2 | |
firmware loader: introduce module parameter to customize(v4) fw search path
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=$CUSTOMIZED_PATH
[1], https://lkml.org/lkml/2012/10/11/337
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base/firmware_class.c')
| -rw-r--r-- | drivers/base/firmware_class.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c index 4b04ec4bd2f0..7888af7941a0 100644 --- a/drivers/base/firmware_class.c +++ b/drivers/base/firmware_class.c @@ -269,13 +269,23 @@ static void fw_free_buf(struct firmware_buf *buf) } /* direct firmware loading support */ -static const char *fw_path[] = { +static char fw_path_para[256]; +static const char * const fw_path[] = { + fw_path_para, "/lib/firmware/updates/" UTS_RELEASE, "/lib/firmware/updates", "/lib/firmware/" UTS_RELEASE, "/lib/firmware" }; +/* + * Typical usage is that passing 'firmware_class.path=$CUSTOMIZED_PATH' + * from kernel command line 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_for_stack long fw_file_size(struct file *file) { @@ -317,6 +327,11 @@ static bool fw_get_filesystem_firmware(struct firmware_buf *buf) for (i = 0; i < ARRAY_SIZE(fw_path); i++) { struct file *file; + + /* skip the unset customized path */ + if (!fw_path[i][0]) + continue; + snprintf(path, PATH_MAX, "%s/%s", fw_path[i], buf->fw_id); file = filp_open(path, O_RDONLY, 0); |