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diff --git a/sys/dev/speaker/spkr.c b/dev/speaker/spkr.c
--- a/sys/dev/speaker/spkr.c
+++ b/dev/speaker/spkr.c
@@ -14,9 +14,12 @@
#include <sys/conf.h>
#include <sys/ctype.h>
#include <sys/malloc.h>
+#include <sys/sema.h>
#include <machine/clock.h>
#include <dev/speaker/speaker.h>
+static struct sema spkr_sema;
+
static d_open_t spkropen;
static d_close_t spkrclose;
static d_write_t spkrwrite;
@@ -24,7 +27,6 @@
static struct cdevsw spkr_cdevsw = {
.d_version = D_VERSION,
- .d_flags = D_NEEDGIANT,
.d_open = spkropen,
.d_close = spkrclose,
.d_write = spkrwrite,
@@ -396,7 +398,6 @@
* endtone(), and rest() functions defined above.
*/
-static int spkr_active = FALSE; /* exclusion flag */
static char *spkr_inbuf; /* incoming buf */
static int
@@ -406,17 +407,17 @@
(void) printf("spkropen: entering with dev = %s\n", devtoname(dev));
#endif /* DEBUG */
- if (spkr_active)
+ int r;
+
+ r = sema_trywait(&spkr_sema);
+ if (r == 0)
return(EBUSY);
- else {
#ifdef DEBUG
- (void) printf("spkropen: about to perform play initialization\n");
+ (void) printf("spkropen: about to perform play initialization\n");
#endif /* DEBUG */
- playinit();
- spkr_inbuf = malloc(DEV_BSIZE, M_SPKR, M_WAITOK);
- spkr_active = TRUE;
- return(0);
- }
+ playinit();
+ spkr_inbuf = malloc(DEV_BSIZE, M_SPKR, M_WAITOK);
+ return(0);
}
static int
@@ -455,7 +456,7 @@
wakeup(&endtone);
wakeup(&endrest);
free(spkr_inbuf, M_SPKR);
- spkr_active = FALSE;
+ sema_post(&spkr_sema);
return(0);
}
@@ -511,12 +512,14 @@
switch(type) {
case MOD_LOAD:
+ sema_init(&spkr_sema, 1, "speaker device semaphore");
speaker_dev = make_dev(&spkr_cdevsw, 0,
UID_ROOT, GID_WHEEL, 0600, "speaker");
break;
case MOD_SHUTDOWN:
case MOD_UNLOAD:
destroy_dev(speaker_dev);
+ sema_destroy(&spkr_sema);
break;
default:
error = EOPNOTSUPP;

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