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linux-sg2042
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firmware loader: cancel uncache work before caching firmware 

Under 'Opportunistic sleep' situation, system sleep might be
triggered very frequently, so the uncahce work may not be completed
before caching firmware during next suspend.

This patch cancels the uncache work before caching firmware to
fix the problem above.

Also this patch optimizes the cacheing firmware mechanism a bit by
only storing one firmware cache entry for one firmware image.

So if the firmware is still cached during suspend, it doesn't need
to be loaded from user space any more.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ming Lei 2012-10-09 12:01:01 +08:00 committed by Greg Kroah-Hartman
parent 6f0c0580b7
commit 373304fe10
1 changed files with 28 additions and 7 deletions
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35
drivers/base/firmware_class.c
View File

@ -1142,6 +1142,18 @@ exit:
return fce;
}
static int __fw_entry_found(const char *name)
{
struct firmware_cache *fwc = &fw_cache;
struct fw_cache_entry *fce;
list_for_each_entry(fce, &fwc->fw_names, list) {
if (!strcmp(fce->name, name))
return 1;
}
return 0;
}
static int fw_cache_piggyback_on_request(const char *name)
{
struct firmware_cache *fwc = &fw_cache;
@ -1149,10 +1161,8 @@ static int fw_cache_piggyback_on_request(const char *name)
int ret = 0;
spin_lock(&fwc->name_lock);
list_for_each_entry(fce, &fwc->fw_names, list) {
if (!strcmp(fce->name, name))
goto found;
}
if (__fw_entry_found(name))
goto found;
fce = alloc_fw_cache_entry(name);
if (fce) {
@ -1229,11 +1239,19 @@ static void dev_cache_fw_image(struct device *dev, void *data)
list_del(&fce->list);
spin_lock(&fwc->name_lock);
fwc->cnt++;
list_add(&fce->list, &fwc->fw_names);
/* only one cache entry for one firmware */
if (!__fw_entry_found(fce->name)) {
fwc->cnt++;
list_add(&fce->list, &fwc->fw_names);
} else {
free_fw_cache_entry(fce);
fce = NULL;
}
spin_unlock(&fwc->name_lock);
async_schedule(__async_dev_cache_fw_image, (void *)fce);
if (fce)
async_schedule(__async_dev_cache_fw_image,
(void *)fce);
}
}
@ -1275,6 +1293,9 @@ static void device_cache_fw_images(void)
pr_debug("%s\n", __func__);
/* cancel uncache work */
cancel_delayed_work_sync(&fwc->work);
/*
* use small loading timeout for caching devices' firmware
* because all these firmware images have been loaded