fw_cfg: fix sparse warnings around FW_CFG_FILE_DIR read

Use struct fw_cfg_files to read the directory size, fixing the sparse
warnings:

drivers/firmware/qemu_fw_cfg.c:485:17: warning: cast to restricted __be32

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/firmware/qemu_fw_cfg.c b/drivers/firmware/qemu_fw_cfg.c
index 0eb155fdfb35..00ad9b862414 100644
--- a/drivers/firmware/qemu_fw_cfg.c
+++ b/drivers/firmware/qemu_fw_cfg.c
@@ -496,19 +496,20 @@ err_register:
 static int fw_cfg_register_dir_entries(void)
 {
         int ret = 0;
+        __be32 files_count;
         u32 count, i;
         struct fw_cfg_file *dir;
         size_t dir_size;
 
-        fw_cfg_read_blob(FW_CFG_FILE_DIR, &count, 0, sizeof(count));
-        count = be32_to_cpu(count);
+        fw_cfg_read_blob(FW_CFG_FILE_DIR, &files_count, 0, sizeof(files_count));
+        count = be32_to_cpu(files_count);
         dir_size = count * sizeof(struct fw_cfg_file);
 
         dir = kmalloc(dir_size, GFP_KERNEL);
         if (!dir)
                 return -ENOMEM;
 
-        fw_cfg_read_blob(FW_CFG_FILE_DIR, dir, sizeof(count), dir_size);
+        fw_cfg_read_blob(FW_CFG_FILE_DIR, dir, sizeof(files_count), dir_size);
 
         for (i = 0; i < count; i++) {
                 ret = fw_cfg_register_file(&dir[i]);