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futex: Remove needless goto's

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As stated in the coding style documentation, "if there is no cleanup
needed then just return directly", instead of jumping to a label and
then returning.

Remove such goto's and replace with a return statement.  When there's a
ternary operator on the return value, replace it with the result of the
operation when it is logically possible to determine it by the control
flow.

Signed-off-by: André Almeida <andrealmeid@collabora.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200702202843.520764-3-andrealmeid@collabora.com
This commit is contained in:
André Almeida 2020-07-02 17:28:41 -03:00 committed by Thomas Gleixner
parent 9180bd467f
commit d7c5ed73b1
1 changed files with 16 additions and 24 deletions
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40
kernel/futex.c
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@ -1607,13 +1607,13 @@ futex_wake(u32 __user *uaddr, unsigned int flags, int nr_wake, u32 bitset)
ret = get_futex_key(uaddr, flags & FLAGS_SHARED, &key, FUTEX_READ);
if (unlikely(ret != 0))
goto out;
return ret;
hb = hash_futex(&key);
/* Make sure we really have tasks to wakeup */
if (!hb_waiters_pending(hb))
goto out;
return ret;
spin_lock(&hb->lock);
@ -1636,7 +1636,6 @@ futex_wake(u32 __user *uaddr, unsigned int flags, int nr_wake, u32 bitset)
spin_unlock(&hb->lock);
wake_up_q(&wake_q);
out:
return ret;
}
@ -1703,10 +1702,10 @@ futex_wake_op(u32 __user *uaddr1, unsigned int flags, u32 __user *uaddr2,
retry:
ret = get_futex_key(uaddr1, flags & FLAGS_SHARED, &key1, FUTEX_READ);
if (unlikely(ret != 0))
goto out;
return ret;
ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2, FUTEX_WRITE);
if (unlikely(ret != 0))
goto out;
return ret;
hb1 = hash_futex(&key1);
hb2 = hash_futex(&key2);
@ -1724,13 +1723,13 @@ retry_private:
* an MMU, but we might get them from range checking
*/
ret = op_ret;
goto out;
return ret;
}
if (op_ret == -EFAULT) {
ret = fault_in_user_writeable(uaddr2);
if (ret)
goto out;
return ret;
}
if (!(flags & FLAGS_SHARED)) {
@ -1773,7 +1772,6 @@ retry_private:
out_unlock:
double_unlock_hb(hb1, hb2);
wake_up_q(&wake_q);
out:
return ret;
}
@ -1980,20 +1978,18 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
retry:
ret = get_futex_key(uaddr1, flags & FLAGS_SHARED, &key1, FUTEX_READ);
if (unlikely(ret != 0))
goto out;
return ret;
ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2,
requeue_pi ? FUTEX_WRITE : FUTEX_READ);
if (unlikely(ret != 0))
goto out;
return ret;
/*
* The check above which compares uaddrs is not sufficient for
* shared futexes. We need to compare the keys:
*/
if (requeue_pi && match_futex(&key1, &key2)) {
ret = -EINVAL;
goto out;
}
if (requeue_pi && match_futex(&key1, &key2))
return -EINVAL;
hb1 = hash_futex(&key1);
hb2 = hash_futex(&key2);
@ -2013,7 +2009,7 @@ retry_private:
ret = get_user(curval, uaddr1);
if (ret)
goto out;
return ret;
if (!(flags & FLAGS_SHARED))
goto retry_private;
@ -2079,7 +2075,7 @@ retry_private:
ret = fault_in_user_writeable(uaddr2);
if (!ret)
goto retry;
goto out;
return ret;
case -EBUSY:
case -EAGAIN:
/*
@ -2198,8 +2194,6 @@ out_unlock:
double_unlock_hb(hb1, hb2);
wake_up_q(&wake_q);
hb_waiters_dec(hb2);
out:
return ret ? ret : task_count;
}
@ -2545,7 +2539,7 @@ static int fixup_owner(u32 __user *uaddr, struct futex_q *q, int locked)
*/
if (q->pi_state->owner != current)
ret = fixup_pi_state_owner(uaddr, q, current);
goto out;
return ret ? ret : locked;
}
/*
@ -2558,7 +2552,7 @@ static int fixup_owner(u32 __user *uaddr, struct futex_q *q, int locked)
*/
if (q->pi_state->owner == current) {
ret = fixup_pi_state_owner(uaddr, q, NULL);
goto out;
return ret;
}
/*
@ -2572,8 +2566,7 @@ static int fixup_owner(u32 __user *uaddr, struct futex_q *q, int locked)
q->pi_state->owner);
}
out:
return ret ? ret : locked;
return ret;
}
/**
@ -2670,7 +2663,7 @@ retry_private:
ret = get_user(uval, uaddr);
if (ret)
goto out;
return ret;
if (!(flags & FLAGS_SHARED))
goto retry_private;
@ -2683,7 +2676,6 @@ retry_private:
ret = -EWOULDBLOCK;
}
out:
return ret;
}