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firmware loader: always let firmware_buf own the pages buffer

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This patch always let firmware_buf own the pages buffer allocated
inside firmware_data_write, and add all instances of firmware_buf
into the firmware cache global list. Also introduce one private field
in 'struct firmware', so release_firmware will see the instance of
firmware_buf associated with the current firmware instance, then just
'free' the instance of firmware_buf.

The firmware_buf instance represents one pages buffer for one
firmware image, so lots of firmware loading requests can share
the same firmware_buf instance if they request the same firmware
image file.

This patch will make implementation of the following cache_firmware/
uncache_firmware very easy and simple.

In fact, the patch improves request_formware/release_firmware:

        - only request userspace to write firmware image once if
	several devices share one same firmware image and its drivers
	call request_firmware concurrently.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ming Lei
2012-08-04 12:01:21 +08:00
committed by Greg Kroah-Hartman
parent 1244691c73
commit 1f2b79599e
2 changed files with 175 additions and 70 deletions
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3
include/linux/firmware.h
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@@ -12,6 +12,9 @@ struct firmware {
size_t size;
const u8 *data;
struct page **pages;
/* firmware loader private fields */
void *priv;
};
struct module;