Matt Mackall wrote:
On Mon, Oct 24, 2005 at 12:29:45AM -0500, Hareesh Nagarajan wrote:
The existing code in init_tmpfs() in mm/tiny-shmem.c does not handle the
cases when the calls to register_filesystem() and kern_mount() fail.
This patch adds those checks.
Hmm. Did you actually encounter this?
No, I haven't. I was just reading the source code when I chanced upon
these trivial error checking omissions.
I'd rather use BUG_ON. Passing up errors is only useful when the code
above can and will do something useful with the information.
[ Snip ]
And what could the higher level, which is simply looping through init
functions, do to handle the error? Retry? Print a warning? Better to
stop everything outright when we encounter a problem we expect should
never happen so it doesn't go by undiagnosed.
Makes sense. New patch attached.
Signed-off-by: Hareesh Nagarajan <[email protected]>
--- linux-2.6.13.4/mm/tiny-shmem.c 2005-10-10 13:54:29.000000000 -0500
+++ linux-2.6.13.4-edit/mm/tiny-shmem.c 2005-10-24 03:43:38.614071000 -0500
@@ -31,12 +31,18 @@
static int __init init_tmpfs(void)
{
- register_filesystem(&tmpfs_fs_type);
+ int error;
+
+ error = register_filesystem(&tmpfs_fs_type);
+ BUG_ON(error);
+
#ifdef CONFIG_TMPFS
devfs_mk_dir("shm");
#endif
shm_mnt = kern_mount(&tmpfs_fs_type);
- return 0;
+ BUG_ON(IS_ERR(shm_mnt));
+
+ return error;
}
module_init(init_tmpfs)
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