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authorTakashi Iwai <tiwai@suse.de>2008-11-03 08:17:05 +0100
committerTakashi Iwai <tiwai@suse.de>2008-11-03 08:57:12 +0100
commit219df32faec97349516c29f33008fea59a46e99a (patch)
tree36dcaeaa04b23c35e6abbec1b219618b9e459dbb
parent8cd2b264d92bb949ddccfb6db6a82254bb07af75 (diff)
ALSA: rawmidi - Add open check in rawmidi callbacks
The drivers (e.g. mtpav) may call rawmidi functions in irq handlers even though the streams are not opened. This results in Oops or panic. This patch adds the rawmidi state check before actually operating the rawmidi buffers. Tested-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--sound/core/rawmidi.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index c4995c9f573..39672f68ce5 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -148,6 +148,8 @@ static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
{
+ if (!substream->opened)
+ return;
if (up) {
tasklet_hi_schedule(&substream->runtime->tasklet);
} else {
@@ -158,6 +160,8 @@ static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *subs
static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
{
+ if (!substream->opened)
+ return;
substream->ops->trigger(substream, up);
if (!up && substream->runtime->event)
tasklet_kill(&substream->runtime->tasklet);
@@ -857,6 +861,8 @@ int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
int result = 0, count1;
struct snd_rawmidi_runtime *runtime = substream->runtime;
+ if (!substream->opened)
+ return -EBADFD;
if (runtime->buffer == NULL) {
snd_printd("snd_rawmidi_receive: input is not active!!!\n");
return -EINVAL;
@@ -1126,6 +1132,8 @@ int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
unsigned char *buffer, int count)
{
+ if (!substream->opened)
+ return -EBADFD;
count = snd_rawmidi_transmit_peek(substream, buffer, count);
if (count < 0)
return count;