diff options
| author | Chuhong Yuan <hslester96@gmail.com> | 2019-08-03 00:48:21 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-08-08 17:58:40 -0700 |
| commit | 4b4de39850474350bfc2f3df33ee1c23d0475c59 (patch) | |
| tree | fcd84345e0df1e14c8d32b371661b7467ce597d3 /drivers/net/hamradio | |
| parent | 31168a6d129aebc02f92d4b7cc9946c0b6364c2b (diff) | |
| download | linux-4b4de39850474350bfc2f3df33ee1c23d0475c59.tar.bz2 | |
mkiss: Use refcount_t for refcount
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>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/hamradio')
| -rw-r--r-- | drivers/net/hamradio/mkiss.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/net/hamradio/mkiss.c b/drivers/net/hamradio/mkiss.c index 442018ccd65e..c5bfa19ddb93 100644 --- a/drivers/net/hamradio/mkiss.c +++ b/drivers/net/hamradio/mkiss.c @@ -25,6 +25,7 @@ #include <linux/skbuff.h> #include <linux/if_arp.h> #include <linux/jiffies.h> +#include <linux/refcount.h> #include <net/ax25.h> @@ -70,7 +71,7 @@ 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 +669,7 @@ 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 +677,7 @@ 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 +705,7 @@ 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 +785,7 @@ 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 |