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kernel/kmod.c: document call_usermodehelper_fns() a bit 

This function's interface is, uh, subtle.  Attempt to apologise for it.

Cc: WANG Cong <xiyou.wangcong@gmail.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Serge Hallyn <serge.hallyn@canonical.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrew Morton 2012-07-30 14:42:17 -07:00 committed by Linus Torvalds
parent deb8274a0c
commit 79c743dd1e
1 changed files with 6 additions and 0 deletions
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6
kernel/kmod.c
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@ -577,6 +577,12 @@ unlock:
return retval;
}
/*
* call_usermodehelper_fns() will not run the caller-provided cleanup function
* if a memory allocation failure is experienced. So the caller might need to
* check the call_usermodehelper_fns() return value: if it is -ENOMEM, perform
* the necessaary cleanup within the caller.
*/
int call_usermodehelper_fns(
char *path, char **argv, char **envp, int wait,
int (*init)(struct subprocess_info *info, struct cred *new),