ALSA: rawmidi: Avoid racy info ioctl via ctl device

[pandora-kernel.git] / sound / core / rawmidi.c

diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 25f6365..74a7fab 100644 (file)
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -575,15 +575,14 @@ static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
        return 0;
 }
 
-int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
+static int __snd_rawmidi_info_select(struct snd_card *card,
+                                    struct snd_rawmidi_info *info)
 {
        struct snd_rawmidi *rmidi;
        struct snd_rawmidi_str *pstr;
        struct snd_rawmidi_substream *substream;
 
-       mutex_lock(&register_mutex);
        rmidi = snd_rawmidi_search(card, info->device);
-       mutex_unlock(&register_mutex);
        if (!rmidi)
                return -ENXIO;
        if (info->stream < 0 || info->stream > 1)
@@ -600,6 +599,16 @@ int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info
        return -ENXIO;
 }
 
+int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
+{
+       int ret;
+
+       mutex_lock(&register_mutex);
+       ret = __snd_rawmidi_info_select(card, info);
+       mutex_unlock(&register_mutex);
+       return ret;
+}
+
 static int snd_rawmidi_info_select_user(struct snd_card *card,
                                        struct snd_rawmidi_info __user *_info)
 {