bdi: test bdi_init failure

There were two places where return value from bdi_init was not tested.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/char_dev.c b/fs/char_dev.c
index afc2bb6..b9bc05b 100644 (file)
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -574,7 +574,8 @@ static struct kobject *base_probe(dev_t dev, int *part, void *data)
 void __init chrdev_init(void)
 {
        cdev_map = kobj_map_init(base_probe, &chrdevs_lock);
-       bdi_init(&directly_mappable_cdev_bdi);
+       if (bdi_init(&directly_mappable_cdev_bdi))
+               panic("Failed to init directly mappable cdev bdi");
 }
 
 

diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 5f66d51..2481900 100644 (file)
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -109,7 +109,7 @@ struct backing_dev_info {
 #endif
 };
 
-int bdi_init(struct backing_dev_info *bdi);
+int __must_check bdi_init(struct backing_dev_info *bdi);
 void bdi_destroy(struct backing_dev_info *bdi);
 
 __printf(3, 4)
@@ -117,7 +117,7 @@ int bdi_register(struct backing_dev_info *bdi, struct device *parent,
                const char *fmt, ...);
 int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev);
 void bdi_unregister(struct backing_dev_info *bdi);
-int bdi_setup_and_register(struct backing_dev_info *, char *, unsigned int);
+int __must_check bdi_setup_and_register(struct backing_dev_info *, char *, unsigned int);
 void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages,
                        enum wb_reason reason);
 void bdi_start_background_writeback(struct backing_dev_info *bdi);

diff --git a/mm/swap.c b/mm/swap.c
index 759c3ca..7a9f80d 100644 (file)
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -934,7 +934,8 @@ void __init swap_setup(void)
 #ifdef CONFIG_SWAP
        int i;
 
-       bdi_init(swapper_spaces[0].backing_dev_info);
+       if (bdi_init(swapper_spaces[0].backing_dev_info))
+               panic("Failed to init swap bdi");
        for (i = 0; i < MAX_SWAPFILES; i++) {
                spin_lock_init(&swapper_spaces[i].tree_lock);
                INIT_LIST_HEAD(&swapper_spaces[i].i_mmap_nonlinear);