sound: rawmidi: fix opened substreams count

The substream_opened field is to count the number of opened substreams,
not the number of times that any substreams have been opened.

Furthermore, all substreams being opened does not imply that the next
open would fail, due to the possibility of O_APPEND.  With this wrong
check, opening a substream multiple times would succeed only if the
device had more unopened substreams.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 4e26563431c8ae273492b50b8ce70c80ae4d2b39..818b1299ed91495a216df754f9407313a401d64d 100644 (file)
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -242,8 +242,6 @@ static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
                return -ENXIO;
        if (subdevice >= 0 && subdevice >= s->substream_count)
                return -ENODEV;
-       if (s->substream_opened >= s->substream_count)
-               return -EAGAIN;
 
        list_for_each_entry(substream, &s->substreams, list) {
                if (substream->opened) {
@@ -280,9 +278,9 @@ static int open_substream(struct snd_rawmidi *rmidi,
                substream->active_sensing = 0;
                if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
                        substream->append = 1;
+               rmidi->streams[substream->stream].substream_opened++;
        }
        substream->use_count++;
-       rmidi->streams[substream->stream].substream_opened++;
        return 0;
 }
 
@@ -466,7 +464,6 @@ static void close_substream(struct snd_rawmidi *rmidi,
                            struct snd_rawmidi_substream *substream,
                            int cleanup)
 {
-       rmidi->streams[substream->stream].substream_opened--;
        if (--substream->use_count)
                return;
 
@@ -491,6 +488,7 @@ static void close_substream(struct snd_rawmidi *rmidi,
        snd_rawmidi_runtime_free(substream);
        substream->opened = 0;
        substream->append = 0;
+       rmidi->streams[substream->stream].substream_opened--;
 }
 
 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)