1 files changed, 77 insertions, 1 deletions

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 6e210802c37b..e85763de928f 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -21,18 +21,85 @@
 #include <linux/firmware.h>
 #include <linux/slab.h>
 #include <linux/sched.h>
+#include <linux/file.h>
 #include <linux/list.h>
 #include <linux/async.h>
 #include <linux/pm.h>
 #include <linux/suspend.h>
 #include <linux/syscore_ops.h>
 
+#include <generated/utsrelease.h>
+
 #include "base.h"
 
 MODULE_AUTHOR("Manuel Estrada Sainz");
 MODULE_DESCRIPTION("Multi purpose firmware loading support");
 MODULE_LICENSE("GPL");
 
+static const char *fw_path[] = {
+        "/lib/firmware/updates/" UTS_RELEASE,
+        "/lib/firmware/updates",
+        "/lib/firmware/" UTS_RELEASE,
+        "/lib/firmware"
+};
+
+/* Don't inline this: 'struct kstat' is biggish */
+static noinline long fw_file_size(struct file *file)
+{
+        struct kstat st;
+        if (vfs_getattr(file->f_path.mnt, file->f_path.dentry, &st))
+                return -1;
+        if (!S_ISREG(st.mode))
+                return -1;
+        if (st.size != (long)st.size)
+                return -1;
+        return st.size;
+}
+
+static bool fw_read_file_contents(struct file *file, struct firmware *fw)
+{
+        loff_t pos;
+        long size;
+        char *buf;
+
+        size = fw_file_size(file);
+        if (size < 0)
+                return false;
+        buf = vmalloc(size);
+        if (!buf)
+                return false;
+        pos = 0;
+        if (vfs_read(file, buf, size, &pos) != size) {
+                vfree(buf);
+                return false;
+        }
+        fw->data = buf;
+        fw->size = size;
+        return true;
+}
+
+static bool fw_get_filesystem_firmware(struct firmware *fw, const char *name)
+{
+        int i;
+        bool success = false;
+        char *path = __getname();
+
+        for (i = 0; i < ARRAY_SIZE(fw_path); i++) {
+                struct file *file;
+                snprintf(path, PATH_MAX, "%s/%s", fw_path[i], name);
+
+                file = filp_open(path, O_RDONLY, 0);
+                if (IS_ERR(file))
+                        continue;
+                success = fw_read_file_contents(file, fw);
+                fput(file);
+                if (success)
+                        break;
+        }
+        __putname(path);
+        return success;
+}
+
 /* Builtin firmware support */
 
 #ifdef CONFIG_FW_LOADER
@@ -346,7 +413,11 @@ static ssize_t firmware_loading_show(struct device *dev,
 /* firmware holds the ownership of pages */
 static void firmware_free_data(const struct firmware *fw)
 {
-        WARN_ON(!fw->priv);
+        /* Loaded directly? */
+        if (!fw->priv) {
+                vfree(fw->data);
+                return;
+        }
         fw_free_buf(fw->priv);
 }
 
@@ -709,6 +780,11 @@ _request_firmware_prepare(const struct firmware **firmware_p, const char *name,
                 return NULL;
         }
 
+        if (fw_get_filesystem_firmware(firmware, name)) {
+                dev_dbg(device, "firmware: direct-loading firmware %s\n", name);
+                return NULL;
+        }
+
         ret = fw_lookup_and_allocate_buf(name, &fw_cache, &buf);
         if (!ret)
                 fw_priv = fw_create_instance(firmware, name, device,