[PATCH] tty/n_gsm.c: use gsm->num to remove mux itself from gsm_mux[]

From: xinhui
Date: Thu Nov 26 2015 - 22:43:19 EST


There is one filed gsm->num to store mux's index of gsm_mux[]. So use
gsm->num to remove itself from gsm_mux[] instead of the for-loop
traverse in gsm_cleanup_mux().

Signed-off-by: Pan Xinhui <xinhui.pan@xxxxxxxxxxxxxxxxxx>
---
drivers/tty/n_gsm.c | 14 +++++---------
1 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 9aff371..cf28054 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -2037,18 +2037,14 @@ static void gsm_cleanup_mux(struct gsm_mux *gsm)

gsm->dead = 1;

- spin_lock(&gsm_mux_lock);
- for (i = 0; i < MAX_MUX; i++) {
- if (gsm_mux[i] == gsm) {
- gsm_mux[i] = NULL;
- break;
- }
- }
- spin_unlock(&gsm_mux_lock);
/* open failed before registering => nothing to do */
- if (i == MAX_MUX)
+ if (gsm_mux[gsm->num] != gsm)
return;

+ spin_lock(&gsm_mux_lock);
+ gsm_mux[gsm->num] = NULL;
+ spin_unlock(&gsm_mux_lock);
+
/* In theory disconnecting DLCI 0 is sufficient but for some
modems this is apparently not the case. */
if (dlci) {
--
1.7.1

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