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

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

Cc: WANG Cong <[email protected]>
Cc: Cyrill Gorcunov <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Serge Hallyn <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: Alan Cox <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Rusty Russell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andrew Morton 2012-07-30 14:42:17 -07:00 • committed by Linus Torvalds
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),