firmware loader: fix one reqeust_firmware race

Several loading requests may be pending on one same
firmware buf, and this patch moves fw_map_pages_buf()
before complete_all(&fw_buf->completion) and let all
requests see the mapped 'buf->data' once the loading
is completed.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index d06a8d0534bfcfaab828d5ca16a298181fce282d..f2882511a9c1993bd708be3979803688e292f812 100644 (file)
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -423,6 +423,18 @@ static void firmware_free_data(const struct firmware *fw)
 #ifndef PAGE_KERNEL_RO
 #define PAGE_KERNEL_RO PAGE_KERNEL
 #endif
+
+/* one pages buffer should be mapped/unmapped only once */
+static int fw_map_pages_buf(struct firmware_buf *buf)
+{
+       if (buf->data)
+               vunmap(buf->data);
+       buf->data = vmap(buf->pages, buf->nr_pages, 0, PAGE_KERNEL_RO);
+       if (!buf->data)
+               return -ENOMEM;
+       return 0;
+}
+
 /**
  * firmware_loading_store - set value in the 'loading' control file
  * @dev: device pointer
@@ -467,6 +479,14 @@ static ssize_t firmware_loading_store(struct device *dev,
                if (test_bit(FW_STATUS_LOADING, &fw_buf->status)) {
                        set_bit(FW_STATUS_DONE, &fw_buf->status);
                        clear_bit(FW_STATUS_LOADING, &fw_buf->status);
+
+                       /*
+                        * Several loading requests may be pending on
+                        * one same firmware buf, so let all requests
+                        * see the mapped 'buf->data' once the loading
+                        * is completed.
+                        * */
+                       fw_map_pages_buf(fw_buf);
                        complete_all(&fw_buf->completion);
                        break;
                }
@@ -670,15 +690,6 @@ exit:
        return fw_priv;
 }
 
-/* one pages buffer is mapped/unmapped only once */
-static int fw_map_pages_buf(struct firmware_buf *buf)
-{
-       buf->data = vmap(buf->pages, buf->nr_pages, 0, PAGE_KERNEL_RO);
-       if (!buf->data)
-               return -ENOMEM;
-       return 0;
-}
-
 /* store the pages buffer info firmware from buf */
 static void fw_set_page_data(struct firmware_buf *buf, struct firmware *fw)
 {
@@ -884,9 +895,6 @@ static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent,
        if (!retval && f_dev->parent)
                fw_add_devm_name(f_dev->parent, buf->fw_id);
 
-       if (!retval)
-               retval = fw_map_pages_buf(buf);
-
        /*
         * After caching firmware image is started, let it piggyback
         * on request firmware.