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ipc: simplify free_copy() call 

Passing and checking of msgflg to free_copy() is redundant.  This patch
sets copy to NULL on declaration instead and checks for non-NULL in
free_copy().

Note: in case of copy allocation failure, error is returned immediately.
So no need to check for IS_ERR() in free_copy().

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Stanislav Kinsbursky 2013-01-04 15:34:58 -08:00 committed by Linus Torvalds
parent 3a665531a3
commit 85398aa8de
1 changed files with 8 additions and 6 deletions
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14
ipc/msg.c
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@ -797,15 +797,17 @@ static inline struct msg_msg *prepare_copy(void __user *buf, size_t bufsz,
return copy;
}
static inline void free_copy(int msgflg, struct msg_msg *copy)
static inline void free_copy(struct msg_msg *copy)
{
if (msgflg & MSG_COPY)
if (copy)
free_msg(copy);
}
#else
#define free_copy(msgflg, copy) do {} while (0)
#define prepare_copy(buf, sz, msgflg, msgtyp, copy_nr) ERR_PTR(-ENOSYS)
#define fill_copy(copy_nr, msg_nr, msg, copy) NULL
static inline void free_copy(struct msg_msg *copy)
{
}
#endif
long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp,
@ -816,7 +818,7 @@ long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp,
struct msg_msg *msg;
int mode;
struct ipc_namespace *ns;
struct msg_msg *copy;
struct msg_msg *copy = NULL;
unsigned long __maybe_unused copy_number;
if (msqid < 0 || (long) bufsz < 0)
@ -831,7 +833,7 @@ long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp,
msq = msg_lock_check(ns, msqid);
if (IS_ERR(msq)) {
free_copy(msgflg, copy);
free_copy(copy);
return PTR_ERR(msq);
}
@ -965,7 +967,7 @@ out_unlock:
}
}
if (IS_ERR(msg)) {
free_copy(msgflg, copy);
free_copy(copy);
return PTR_ERR(msg);
}