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firmware_class: fix memory leak - free allocated pages

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commit dd336c554d upstream.

fix memory leak introduced by the patch 6e03a201bb:
firmware: speed up request_firmware()

1. vfree won't release pages there were allocated explicitly and mapped
using vmap. The memory has to be vunmap-ed and the pages needs
to be freed explicitly

2. page array is moved into the 'struct
firmware' so that we can free it from release_firmware()
and not only in fw_dev_release()

The fix doesn't break the firmware load speed.

Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Ming Lei <tom.leiming@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Singed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Woodhouse
2010-05-02 11:21:21 +03:00
committed by Greg Kroah-Hartman
parent 46287c9a80
commit e48db6326e
2 changed files with 21 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/base/firmware_class.c
View File

@@ -125,6 +125,17 @@ static ssize_t firmware_loading_show(struct device *dev,
return sprintf(buf, "%d\n", loading);
}
static void firmware_free_data(const struct firmware *fw)
{
int i;
vunmap(fw->data);
if (fw->pages) {
for (i = 0; i < PFN_UP(fw->size); i++)
__free_page(fw->pages[i]);
kfree(fw->pages);
}
}
/* Some architectures don't have PAGE_KERNEL_RO */
#ifndef PAGE_KERNEL_RO
#define PAGE_KERNEL_RO PAGE_KERNEL
@@ -157,21 +168,21 @@ static ssize_t firmware_loading_store(struct device *dev,
mutex_unlock(&fw_lock);
break;
}
vfree(fw_priv->fw->data);
fw_priv->fw->data = NULL;
firmware_free_data(fw_priv->fw);
memset(fw_priv->fw, 0, sizeof(struct firmware));
/* If the pages are not owned by 'struct firmware' */
for (i = 0; i < fw_priv->nr_pages; i++)
__free_page(fw_priv->pages[i]);
kfree(fw_priv->pages);
fw_priv->pages = NULL;
fw_priv->page_array_size = 0;
fw_priv->nr_pages = 0;
fw_priv->fw->size = 0;
set_bit(FW_STATUS_LOADING, &fw_priv->status);
mutex_unlock(&fw_lock);
break;
case 0:
if (test_bit(FW_STATUS_LOADING, &fw_priv->status)) {
vfree(fw_priv->fw->data);
vunmap(fw_priv->fw->data);
fw_priv->fw->data = vmap(fw_priv->pages,
fw_priv->nr_pages,
0, PAGE_KERNEL_RO);
@@ -179,7 +190,10 @@ static ssize_t firmware_loading_store(struct device *dev,
dev_err(dev, "%s: vmap() failed\n", __func__);
goto err;
}
/* Pages will be freed by vfree() */
/* Pages are now owned by 'struct firmware' */
fw_priv->fw->pages = fw_priv->pages;
fw_priv->pages = NULL;
fw_priv->page_array_size = 0;
fw_priv->nr_pages = 0;
complete(&fw_priv->completion);
@@ -572,7 +586,7 @@ release_firmware(const struct firmware *fw)
if (fw->data == builtin->data)
goto free_fw;
}
vfree(fw->data);
firmware_free_data(fw);
free_fw:
kfree(fw);
}

1
include/linux/firmware.h
View File

@@ -11,6 +11,7 @@
struct firmware {
size_t size;
const u8 *data;
struct page **pages;
};
struct device;