init/do_mounts.c: print error code on mount failure

Printing the error code makes it easier to debug the cause of a mount failure. For example I had the problem that the root file system could not be mounted read-writeable because my SD card was write-protected. Without an error code it looks like the SD card was not detected at all. Signed-off-by: Bernhard Walle <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
chewitt · Mar 23, 2012 · 0e0cb89 · 0e0cb89
1 parent 8595c53
commit 0e0cb89
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/init/do_mounts.c b/init/do_mounts.c
@@ -373,8 +373,8 @@ void __init mount_block_root(char *name, int flags)
 #ifdef CONFIG_BLOCK
 		__bdevname(ROOT_DEV, b);
 #endif
-		printk("VFS: Cannot open root device \"%s\" or %s\n",
-				root_device_name, b);
+		printk("VFS: Cannot open root device \"%s\" or %s: error %d\n",
+				root_device_name, b, err);
 		printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
 
 		printk_all_partitions();