ALSA: OSS mixer emulation - fix locking

Fix mutex release and cleanup some locking code.

Cc: <stable@kernel.org>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

diff --git a/sound/core/oss/mixer_oss.c b/sound/core/oss/mixer_oss.c
index f50ebf2..8442a08 100644 (file)
--- a/sound/core/oss/mixer_oss.c
+++ b/sound/core/oss/mixer_oss.c
@@ -618,8 +618,10 @@ static void snd_mixer_oss_put_volume1_vol(struct snd_mixer_oss_file *fmixer,
        if (numid == ID_UNKNOWN)
                return;
        down_read(&card->controls_rwsem);
-       if ((kctl = snd_ctl_find_numid(card, numid)) == NULL)
+       if ((kctl = snd_ctl_find_numid(card, numid)) == NULL) {
+               up_read(&card->controls_rwsem);
                return;
+       }
        uinfo = kzalloc(sizeof(*uinfo), GFP_KERNEL);
        uctl = kzalloc(sizeof(*uctl), GFP_KERNEL);
        if (uinfo == NULL || uctl == NULL)
@@ -658,7 +660,7 @@ static void snd_mixer_oss_put_volume1_sw(struct snd_mixer_oss_file *fmixer,
                return;
        down_read(&card->controls_rwsem);
        if ((kctl = snd_ctl_find_numid(card, numid)) == NULL) {
-               up_read(&fmixer->card->controls_rwsem);
+               up_read(&card->controls_rwsem);
                return;
        }
        uinfo = kzalloc(sizeof(*uinfo), GFP_KERNEL);
@@ -797,7 +799,7 @@ static int snd_mixer_oss_get_recsrc2(struct snd_mixer_oss_file *fmixer, unsigned
        uctl = kzalloc(sizeof(*uctl), GFP_KERNEL);
        if (uinfo == NULL || uctl == NULL) {
                err = -ENOMEM;
-               goto __unlock;
+               goto __free_only;
        }
        down_read(&card->controls_rwsem);
        kctl = snd_mixer_oss_test_id(mixer, "Capture Source", 0);
@@ -826,6 +828,7 @@ static int snd_mixer_oss_get_recsrc2(struct snd_mixer_oss_file *fmixer, unsigned
        err = 0;
       __unlock:
        up_read(&card->controls_rwsem);
+      __free_only:
        kfree(uctl);
        kfree(uinfo);
        return err;
@@ -847,7 +850,7 @@ static int snd_mixer_oss_put_recsrc2(struct snd_mixer_oss_file *fmixer, unsigned
        uctl = kzalloc(sizeof(*uctl), GFP_KERNEL);
        if (uinfo == NULL || uctl == NULL) {
                err = -ENOMEM;
-               goto __unlock;
+               goto __free_only;
        }
        down_read(&card->controls_rwsem);
        kctl = snd_mixer_oss_test_id(mixer, "Capture Source", 0);
@@ -880,6 +883,7 @@ static int snd_mixer_oss_put_recsrc2(struct snd_mixer_oss_file *fmixer, unsigned
        err = 0;
       __unlock:
        up_read(&card->controls_rwsem);
+      __free_only:
        kfree(uctl);
        kfree(uinfo);
        return err;