ALSA: ice1724 - Check error in set_rate function

The set_rate might return error but the current code doesn't check it.
This patch adds a proper error check.

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

diff --git a/sound/pci/ice1712/ice1724.c b/sound/pci/ice1712/ice1724.c
index 128510e77a785344886cf6d3207b244850ed6245..5c5ef7fa3e83959e37084e4dc4d702addb3ceab5 100644 (file)
--- a/sound/pci/ice1712/ice1724.c
+++ b/sound/pci/ice1712/ice1724.c
@@ -626,7 +626,7 @@ static unsigned char stdclock_set_mclk(struct snd_ice1712 *ice,
        return 0;
 }
 
-static void snd_vt1724_set_pro_rate(struct snd_ice1712 *ice, unsigned int rate,
+static int snd_vt1724_set_pro_rate(struct snd_ice1712 *ice, unsigned int rate,
                                    int force)
 {
        unsigned long flags;
@@ -634,17 +634,18 @@ static void snd_vt1724_set_pro_rate(struct snd_ice1712 *ice, unsigned int rate,
        unsigned int i, old_rate;
 
        if (rate > ice->hw_rates->list[ice->hw_rates->count - 1])
-               return;
+               return -EINVAL;
+
        spin_lock_irqsave(&ice->reg_lock, flags);
        if ((inb(ICEMT1724(ice, DMA_CONTROL)) & DMA_STARTS) ||
            (inb(ICEMT1724(ice, DMA_PAUSE)) & DMA_PAUSES)) {
                /* running? we cannot change the rate now... */
                spin_unlock_irqrestore(&ice->reg_lock, flags);
-               return;
+               return -EBUSY;
        }
        if (!force && is_pro_rate_locked(ice)) {
                spin_unlock_irqrestore(&ice->reg_lock, flags);
-               return;
+               return (rate == ice->cur_rate) ? 0 : -EBUSY;
        }
 
        old_rate = ice->get_rate(ice);
@@ -652,7 +653,7 @@ static void snd_vt1724_set_pro_rate(struct snd_ice1712 *ice, unsigned int rate,
                ice->set_rate(ice, rate);
        else if (rate == ice->cur_rate) {
                spin_unlock_irqrestore(&ice->reg_lock, flags);
-               return;
+               return 0;
        }
 
        ice->cur_rate = rate;
@@ -674,13 +675,15 @@ static void snd_vt1724_set_pro_rate(struct snd_ice1712 *ice, unsigned int rate,
        }
        if (ice->spdif.ops.setup_rate)
                ice->spdif.ops.setup_rate(ice, rate);
+
+       return 0;
 }
 
 static int snd_vt1724_pcm_hw_params(struct snd_pcm_substream *substream,
                                    struct snd_pcm_hw_params *hw_params)
 {
        struct snd_ice1712 *ice = snd_pcm_substream_chip(substream);
-       int i, chs;
+       int i, chs, err;
 
        chs = params_channels(hw_params);
        mutex_lock(&ice->open_mutex);
@@ -715,7 +718,11 @@ static int snd_vt1724_pcm_hw_params(struct snd_pcm_substream *substream,
                }
        }
        mutex_unlock(&ice->open_mutex);
-       snd_vt1724_set_pro_rate(ice, params_rate(hw_params), 0);
+
+       err = snd_vt1724_set_pro_rate(ice, params_rate(hw_params), 0);
+       if (err < 0)
+               return err;
+
        return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
 }