[PATCH] driver/base/memory.c: handle errors properly

Do proper error-checking and propagation in drivers/base/memory.c, hence fix
__must_check warnings.

Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index c6b7d9c..74b9679 100644 (file)
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -290,9 +290,8 @@ static CLASS_ATTR(block_size_bytes, 0444, print_block_size, NULL);
 
 static int block_size_init(void)
 {
-       sysfs_create_file(&memory_sysdev_class.kset.kobj,
-               &class_attr_block_size_bytes.attr);
-       return 0;
+       return sysfs_create_file(&memory_sysdev_class.kset.kobj,
+                               &class_attr_block_size_bytes.attr);
 }
 
 /*
@@ -323,12 +322,14 @@ static CLASS_ATTR(probe, 0700, NULL, memory_probe_store);
 
 static int memory_probe_init(void)
 {
-       sysfs_create_file(&memory_sysdev_class.kset.kobj,
-               &class_attr_probe.attr);
-       return 0;
+       return sysfs_create_file(&memory_sysdev_class.kset.kobj,
+                               &class_attr_probe.attr);
 }
 #else
-#define memory_probe_init(...) do {} while (0)
+static inline int memory_probe_init(void)
+{
+       return 0;
+}
 #endif
 
 /*
@@ -431,9 +432,12 @@ int __init memory_dev_init(void)
 {
        unsigned int i;
        int ret;
+       int err;
 
        memory_sysdev_class.kset.uevent_ops = &memory_uevent_ops;
        ret = sysdev_class_register(&memory_sysdev_class);
+       if (ret)
+               goto out;
 
        /*
         * Create entries for memory sections that were found
@@ -442,11 +446,19 @@ int __init memory_dev_init(void)
        for (i = 0; i < NR_MEM_SECTIONS; i++) {
                if (!valid_section_nr(i))
                        continue;
-               add_memory_block(0, __nr_to_section(i), MEM_ONLINE, 0);
+               err = add_memory_block(0, __nr_to_section(i), MEM_ONLINE, 0);
+               if (!ret)
+                       ret = err;
        }
 
-       memory_probe_init();
-       block_size_init();
-
+       err = memory_probe_init();
+       if (!ret)
+               ret = err;
+       err = block_size_init();
+       if (!ret)
+               ret = err;
+out:
+       if (ret)
+               printk(KERN_ERR "%s() failed: %d\n", __FUNCTION__, ret);
        return ret;
 }