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synced 2024-12-06 02:24:14 +08:00
firmware: speed up request_firmware(), v3
Rather than calling vmalloc() repeatedly to grow the firmware image as we receive data from userspace, just allocate and fill individual pages. Then vmap() the whole lot in one go when we're done. A quick test with a 337KiB iwlagn firmware shows the time taken for request_firmware() going from ~32ms to ~5ms after I apply this patch. [v2: define PAGE_KERNEL_RO as PAGE_KERNEL where necessary, use min_t()] [v3: kunmap() takes the struct page *, not the virtual address] Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Tested-by: Sachin Sant <sachinp@in.ibm.com>
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091bf7624d
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6e03a201bb
@ -17,7 +17,7 @@
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#include <linux/bitops.h>
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#include <linux/bitops.h>
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#include <linux/mutex.h>
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#include <linux/mutex.h>
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#include <linux/kthread.h>
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#include <linux/kthread.h>
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#include <linux/highmem.h>
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#include <linux/firmware.h>
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#include <linux/firmware.h>
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#include "base.h"
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#include "base.h"
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@ -45,7 +45,10 @@ struct firmware_priv {
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struct bin_attribute attr_data;
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struct bin_attribute attr_data;
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struct firmware *fw;
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struct firmware *fw;
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unsigned long status;
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unsigned long status;
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int alloc_size;
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struct page **pages;
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int nr_pages;
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int page_array_size;
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const char *vdata;
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struct timer_list timeout;
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struct timer_list timeout;
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};
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};
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@ -122,6 +125,10 @@ static ssize_t firmware_loading_show(struct device *dev,
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return sprintf(buf, "%d\n", loading);
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return sprintf(buf, "%d\n", loading);
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}
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}
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/* Some architectures don't have PAGE_KERNEL_RO */
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#ifndef PAGE_KERNEL_RO
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#define PAGE_KERNEL_RO PAGE_KERNEL
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#endif
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/**
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/**
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* firmware_loading_store - set value in the 'loading' control file
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* firmware_loading_store - set value in the 'loading' control file
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* @dev: device pointer
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* @dev: device pointer
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@ -141,6 +148,7 @@ static ssize_t firmware_loading_store(struct device *dev,
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{
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{
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struct firmware_priv *fw_priv = dev_get_drvdata(dev);
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struct firmware_priv *fw_priv = dev_get_drvdata(dev);
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int loading = simple_strtol(buf, NULL, 10);
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int loading = simple_strtol(buf, NULL, 10);
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int i;
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switch (loading) {
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switch (loading) {
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case 1:
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case 1:
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@ -151,13 +159,30 @@ static ssize_t firmware_loading_store(struct device *dev,
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}
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}
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vfree(fw_priv->fw->data);
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vfree(fw_priv->fw->data);
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fw_priv->fw->data = NULL;
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fw_priv->fw->data = NULL;
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for (i = 0; i < fw_priv->nr_pages; i++)
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__free_page(fw_priv->pages[i]);
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kfree(fw_priv->pages);
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fw_priv->pages = NULL;
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fw_priv->page_array_size = 0;
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fw_priv->nr_pages = 0;
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fw_priv->fw->size = 0;
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fw_priv->fw->size = 0;
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fw_priv->alloc_size = 0;
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set_bit(FW_STATUS_LOADING, &fw_priv->status);
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set_bit(FW_STATUS_LOADING, &fw_priv->status);
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mutex_unlock(&fw_lock);
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mutex_unlock(&fw_lock);
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break;
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break;
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case 0:
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case 0:
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if (test_bit(FW_STATUS_LOADING, &fw_priv->status)) {
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if (test_bit(FW_STATUS_LOADING, &fw_priv->status)) {
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vfree(fw_priv->fw->data);
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fw_priv->fw->data = vmap(fw_priv->pages,
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fw_priv->nr_pages,
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0, PAGE_KERNEL_RO);
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if (!fw_priv->fw->data) {
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dev_err(dev, "%s: vmap() failed\n", __func__);
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goto err;
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}
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/* Pages will be freed by vfree() */
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fw_priv->pages = NULL;
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fw_priv->page_array_size = 0;
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fw_priv->nr_pages = 0;
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complete(&fw_priv->completion);
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complete(&fw_priv->completion);
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clear_bit(FW_STATUS_LOADING, &fw_priv->status);
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clear_bit(FW_STATUS_LOADING, &fw_priv->status);
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break;
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break;
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@ -167,6 +192,7 @@ static ssize_t firmware_loading_store(struct device *dev,
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dev_err(dev, "%s: unexpected value (%d)\n", __func__, loading);
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dev_err(dev, "%s: unexpected value (%d)\n", __func__, loading);
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/* fallthrough */
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/* fallthrough */
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case -1:
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case -1:
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err:
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fw_load_abort(fw_priv);
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fw_load_abort(fw_priv);
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break;
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break;
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}
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}
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@ -191,8 +217,28 @@ firmware_data_read(struct kobject *kobj, struct bin_attribute *bin_attr,
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ret_count = -ENODEV;
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ret_count = -ENODEV;
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goto out;
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goto out;
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}
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}
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ret_count = memory_read_from_buffer(buffer, count, &offset,
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if (offset > fw->size)
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fw->data, fw->size);
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return 0;
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if (count > fw->size - offset)
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count = fw->size - offset;
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ret_count = count;
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while (count) {
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void *page_data;
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int page_nr = offset >> PAGE_SHIFT;
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int page_ofs = offset & (PAGE_SIZE-1);
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int page_cnt = min_t(size_t, PAGE_SIZE - page_ofs, count);
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page_data = kmap(fw_priv->pages[page_nr]);
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memcpy(buffer, page_data + page_ofs, page_cnt);
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kunmap(fw_priv->pages[page_nr]);
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buffer += page_cnt;
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offset += page_cnt;
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count -= page_cnt;
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}
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out:
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out:
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mutex_unlock(&fw_lock);
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mutex_unlock(&fw_lock);
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return ret_count;
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return ret_count;
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@ -201,27 +247,39 @@ out:
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static int
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static int
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fw_realloc_buffer(struct firmware_priv *fw_priv, int min_size)
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fw_realloc_buffer(struct firmware_priv *fw_priv, int min_size)
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{
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{
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u8 *new_data;
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int pages_needed = ALIGN(min_size, PAGE_SIZE) >> PAGE_SHIFT;
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int new_size = fw_priv->alloc_size;
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if (min_size <= fw_priv->alloc_size)
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/* If the array of pages is too small, grow it... */
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return 0;
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if (fw_priv->page_array_size < pages_needed) {
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int new_array_size = max(pages_needed,
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fw_priv->page_array_size * 2);
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struct page **new_pages;
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new_size = ALIGN(min_size, PAGE_SIZE);
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new_pages = kmalloc(new_array_size * sizeof(void *),
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new_data = vmalloc(new_size);
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GFP_KERNEL);
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if (!new_data) {
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if (!new_pages) {
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printk(KERN_ERR "%s: unable to alloc buffer\n", __func__);
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fw_load_abort(fw_priv);
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/* Make sure that we don't keep incomplete data */
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return -ENOMEM;
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fw_load_abort(fw_priv);
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}
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return -ENOMEM;
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memcpy(new_pages, fw_priv->pages,
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fw_priv->page_array_size * sizeof(void *));
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memset(&new_pages[fw_priv->page_array_size], 0, sizeof(void *) *
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(new_array_size - fw_priv->page_array_size));
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kfree(fw_priv->pages);
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fw_priv->pages = new_pages;
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fw_priv->page_array_size = new_array_size;
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}
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}
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fw_priv->alloc_size = new_size;
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if (fw_priv->fw->data) {
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while (fw_priv->nr_pages < pages_needed) {
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memcpy(new_data, fw_priv->fw->data, fw_priv->fw->size);
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fw_priv->pages[fw_priv->nr_pages] =
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vfree(fw_priv->fw->data);
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alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
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if (!fw_priv->pages[fw_priv->nr_pages]) {
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fw_load_abort(fw_priv);
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return -ENOMEM;
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}
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fw_priv->nr_pages++;
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}
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}
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fw_priv->fw->data = new_data;
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BUG_ON(min_size > fw_priv->alloc_size);
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return 0;
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return 0;
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}
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}
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@ -258,10 +316,25 @@ firmware_data_write(struct kobject *kobj, struct bin_attribute *bin_attr,
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if (retval)
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if (retval)
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goto out;
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goto out;
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memcpy((u8 *)fw->data + offset, buffer, count);
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fw->size = max_t(size_t, offset + count, fw->size);
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retval = count;
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retval = count;
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while (count) {
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void *page_data;
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int page_nr = offset >> PAGE_SHIFT;
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int page_ofs = offset & (PAGE_SIZE - 1);
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int page_cnt = min_t(size_t, PAGE_SIZE - page_ofs, count);
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page_data = kmap(fw_priv->pages[page_nr]);
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memcpy(page_data + page_ofs, buffer, page_cnt);
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kunmap(fw_priv->pages[page_nr]);
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buffer += page_cnt;
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offset += page_cnt;
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count -= page_cnt;
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}
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fw->size = max_t(size_t, offset, fw->size);
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out:
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out:
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mutex_unlock(&fw_lock);
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mutex_unlock(&fw_lock);
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return retval;
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return retval;
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@ -277,7 +350,11 @@ static struct bin_attribute firmware_attr_data_tmpl = {
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static void fw_dev_release(struct device *dev)
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static void fw_dev_release(struct device *dev)
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{
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{
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struct firmware_priv *fw_priv = dev_get_drvdata(dev);
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struct firmware_priv *fw_priv = dev_get_drvdata(dev);
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int i;
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for (i = 0; i < fw_priv->nr_pages; i++)
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__free_page(fw_priv->pages[i]);
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kfree(fw_priv->pages);
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kfree(fw_priv);
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kfree(fw_priv);
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kfree(dev);
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kfree(dev);
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