ALSA: hda - Clear pcm pointer assigned to hda_pcm at device removal

We leave the pcm field of struct hda_pcm at removal of each device, so
far.  This hasn't been a problem since unbinding the codec driver
isn't supposed to happen and another route via snd_hda_codec_reset()
clears all the once.  However, for a proper unbind implementation, we
need to care about it.

This patch does the thing above properly:

- Include struct hda_pcm pointer instead of struct hda_pcm_stream
  pointers in struct azx_dev.  This allows us to point the hda_pcm
  object at dev_free callback.

- Introduce to_hda_pcm_stream() macro for better readability.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/hda_controller.c b/sound/pci/hda/hda_controller.c
index 789ca66..1695f0e 100644 (file)
--- a/sound/pci/hda/hda_controller.c
+++ b/sound/pci/hda/hda_controller.c
@@ -258,11 +258,18 @@ static void azx_timecounter_init(struct snd_pcm_substream *substream,
                tc->cycle_last = last;
 }
 
+static inline struct hda_pcm_stream *
+to_hda_pcm_stream(struct snd_pcm_substream *substream)
+{
+       struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
+       return &apcm->info->stream[substream->stream];
+}
+
 static u64 azx_adjust_codec_delay(struct snd_pcm_substream *substream,
                                u64 nsec)
 {
        struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
-       struct hda_pcm_stream *hinfo = apcm->hinfo[substream->stream];
+       struct hda_pcm_stream *hinfo = to_hda_pcm_stream(substream);
        u64 codec_frames, codec_nsecs;
 
        if (!hinfo->ops.get_delay)
@@ -398,7 +405,7 @@ static int azx_setup_periods(struct azx *chip,
 static int azx_pcm_close(struct snd_pcm_substream *substream)
 {
        struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
-       struct hda_pcm_stream *hinfo = apcm->hinfo[substream->stream];
+       struct hda_pcm_stream *hinfo = to_hda_pcm_stream(substream);
        struct azx *chip = apcm->chip;
        struct azx_dev *azx_dev = get_azx_dev(substream);
        unsigned long flags;
@@ -440,7 +447,7 @@ static int azx_pcm_hw_free(struct snd_pcm_substream *substream)
        struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
        struct azx_dev *azx_dev = get_azx_dev(substream);
        struct azx *chip = apcm->chip;
-       struct hda_pcm_stream *hinfo = apcm->hinfo[substream->stream];
+       struct hda_pcm_stream *hinfo = to_hda_pcm_stream(substream);
        int err;
 
        /* reset BDL address */
@@ -467,7 +474,7 @@ static int azx_pcm_prepare(struct snd_pcm_substream *substream)
        struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
        struct azx *chip = apcm->chip;
        struct azx_dev *azx_dev = get_azx_dev(substream);
-       struct hda_pcm_stream *hinfo = apcm->hinfo[substream->stream];
+       struct hda_pcm_stream *hinfo = to_hda_pcm_stream(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        unsigned int bufsize, period_bytes, format_val, stream_tag;
        int err;
@@ -707,7 +714,7 @@ unsigned int azx_get_position(struct azx *chip,
 
        if (substream->runtime) {
                struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
-               struct hda_pcm_stream *hinfo = apcm->hinfo[stream];
+               struct hda_pcm_stream *hinfo = to_hda_pcm_stream(substream);
 
                if (chip->get_delay[stream])
                        delay += chip->get_delay[stream](chip, azx_dev, pos);
@@ -790,7 +797,7 @@ static struct snd_pcm_hardware azx_pcm_hw = {
 static int azx_pcm_open(struct snd_pcm_substream *substream)
 {
        struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
-       struct hda_pcm_stream *hinfo = apcm->hinfo[substream->stream];
+       struct hda_pcm_stream *hinfo = to_hda_pcm_stream(substream);
        struct azx *chip = apcm->chip;
        struct azx_dev *azx_dev;
        struct snd_pcm_runtime *runtime = substream->runtime;
@@ -904,6 +911,7 @@ static void azx_pcm_free(struct snd_pcm *pcm)
        struct azx_pcm *apcm = pcm->private_data;
        if (apcm) {
                list_del(&apcm->list);
+               apcm->info->pcm = NULL;
                kfree(apcm);
        }
 }
@@ -940,6 +948,7 @@ static int azx_attach_pcm_stream(struct hda_bus *bus, struct hda_codec *codec,
        apcm->chip = chip;
        apcm->pcm = pcm;
        apcm->codec = codec;
+       apcm->info = cpcm;
        pcm->private_data = apcm;
        pcm->private_free = azx_pcm_free;
        if (cpcm->pcm_type == HDA_PCM_TYPE_MODEM)
@@ -947,7 +956,6 @@ static int azx_attach_pcm_stream(struct hda_bus *bus, struct hda_codec *codec,
        list_add_tail(&apcm->list, &chip->pcm_list);
        cpcm->pcm = pcm;
        for (s = 0; s < 2; s++) {
-               apcm->hinfo[s] = &cpcm->stream[s];
                if (cpcm->stream[s].substreams)
                        snd_pcm_set_ops(pcm, s, &azx_pcm_ops);
        }

diff --git a/sound/pci/hda/hda_controller.h b/sound/pci/hda/hda_controller.h
index e4f46a2..94c1a47 100644 (file)
--- a/sound/pci/hda/hda_controller.h
+++ b/sound/pci/hda/hda_controller.h
@@ -283,7 +283,7 @@ struct azx_pcm {
        struct azx *chip;
        struct snd_pcm *pcm;
        struct hda_codec *codec;
-       struct hda_pcm_stream *hinfo[2];
+       struct hda_pcm *info;
        struct list_head list;
 };