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Subject[PATCH] mkiss: Use refcount_t for refcount
Date
refcount_t is better for reference counters since its
implementation can prevent overflows.
So convert atomic_t ref counters to refcount_t.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
---
drivers/net/hamradio/mkiss.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/hamradio/mkiss.c b/drivers/net/hamradio/mkiss.c
index 442018ccd65e..b0afd7d13553 100644
--- a/drivers/net/hamradio/mkiss.c
+++ b/drivers/net/hamradio/mkiss.c
@@ -70,7 +70,7 @@ struct mkiss {
#define CRC_MODE_FLEX_TEST 3
#define CRC_MODE_SMACK_TEST 4

- atomic_t refcnt;
+ refcount_t refcnt;
struct completion dead;
};

@@ -668,7 +668,7 @@ static struct mkiss *mkiss_get(struct tty_struct *tty)
read_lock(&disc_data_lock);
ax = tty->disc_data;
if (ax)
- atomic_inc(&ax->refcnt);
+ refcount_inc(&ax->refcnt);
read_unlock(&disc_data_lock);

return ax;
@@ -676,7 +676,7 @@ static struct mkiss *mkiss_get(struct tty_struct *tty)

static void mkiss_put(struct mkiss *ax)
{
- if (atomic_dec_and_test(&ax->refcnt))
+ if (refcount_dec_and_test(&ax->refcnt))
complete(&ax->dead);
}

@@ -704,7 +704,7 @@ static int mkiss_open(struct tty_struct *tty)
ax->dev = dev;

spin_lock_init(&ax->buflock);
- atomic_set(&ax->refcnt, 1);
+ refcount_set(&ax->refcnt, 1);
init_completion(&ax->dead);

ax->tty = tty;
@@ -784,7 +784,7 @@ static void mkiss_close(struct tty_struct *tty)
* We have now ensured that nobody can start using ap from now on, but
* we have to wait for all existing users to finish.
*/
- if (!atomic_dec_and_test(&ax->refcnt))
+ if (!refcount_dec_and_test(&ax->refcnt))
wait_for_completion(&ax->dead);
/*
* Halt the transmit queue so that a new transmit cannot scribble
--
2.20.1
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