spin_lock in t4_set_timing_source in wct4xxp.c (fixes panic on SMP)

git-svn-id: http://svn.digium.com/svn/zaptel/trunk@336 5390a7c7-147a-4af0-8ec9-7488f05a26cb

1 files changed, 5 insertions, 0 deletions

diff --git a/wct4xxp.c b/wct4xxp.c
index b3fc717..5792e3a 100755
--- a/wct4xxp.c
+++ b/wct4xxp.c
@@ -627,11 +627,15 @@ static void t4_serial_setup(struct t4 *wc, int unit)
 		printk("Successfully initialized serial bus for unit %d\n", unit);
 }
 
+static spinlock_t synclock = SPIN_LOCK_UNLOCKED;
+
 static void t4_set_timing_source(struct t4 *wc, int unit)
 {
 	unsigned int timing;
+	unsigned long flags;
 	int x;
 	timing = 0x34;		/* CMR1: RCLK unit, 8.192 Mhz TCLK, RCLK is 8.192 Mhz */
+	spin_lock_irqsave(&synclock, flags);
 	if ((unit > -1) && (unit < 4)) {
 		timing |= (unit << 6);
 	} else {
@@ -654,6 +658,7 @@ static void t4_set_timing_source(struct t4 *wc, int unit)
 	wc->syncsrc = unit;
 	for (x=0;x<4;x++)
 		wc->spans[x].syncsrc = unit;
+	spin_unlock_irqrestore(&synclock, flags);
 }
 
 static void t4_set_timing_source_auto(struct t4 *wc)