ALSA: 6fire: make buffers DMA-able (pcm)

Patch makes pcm buffers DMA-able by allocating each one separately.

Signed-off-by: Torsten Schenk <torsten.schenk@zoho.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/6fire/pcm.c b/sound/usb/6fire/pcm.c
index 3d2551cc10f2f6fc191acea154ff2a2bc303b09e..b5eb97fdc842f79893adc8d359c4e519df82d700 100644 (file)
--- a/sound/usb/6fire/pcm.c
+++ b/sound/usb/6fire/pcm.c
@@ -582,6 +582,33 @@ static void usb6fire_pcm_init_urb(struct pcm_urb *urb,
        urb->instance.number_of_packets = PCM_N_PACKETS_PER_URB;
 }
 
+static int usb6fire_pcm_buffers_init(struct pcm_runtime *rt)
+{
+       int i;
+
+       for (i = 0; i < PCM_N_URBS; i++) {
+               rt->out_urbs[i].buffer = kzalloc(PCM_N_PACKETS_PER_URB
+                               * PCM_MAX_PACKET_SIZE, GFP_KERNEL);
+               if (!rt->out_urbs[i].buffer)
+                       return -ENOMEM;
+               rt->in_urbs[i].buffer = kzalloc(PCM_N_PACKETS_PER_URB
+                               * PCM_MAX_PACKET_SIZE, GFP_KERNEL);
+               if (!rt->in_urbs[i].buffer)
+                       return -ENOMEM;
+       }
+       return 0;
+}
+
+static void usb6fire_pcm_buffers_destroy(struct pcm_runtime *rt)
+{
+       int i;
+
+       for (i = 0; i < PCM_N_URBS; i++) {
+               kfree(rt->out_urbs[i].buffer);
+               kfree(rt->in_urbs[i].buffer);
+       }
+}
+
 int usb6fire_pcm_init(struct sfire_chip *chip)
 {
        int i;
@@ -593,6 +620,13 @@ int usb6fire_pcm_init(struct sfire_chip *chip)
        if (!rt)
                return -ENOMEM;
 
+       ret = usb6fire_pcm_buffers_init(rt);
+       if (ret) {
+               usb6fire_pcm_buffers_destroy(rt);
+               kfree(rt);
+               return ret;
+       }
+
        rt->chip = chip;
        rt->stream_state = STREAM_DISABLED;
        rt->rate = ARRAY_SIZE(rates);
@@ -614,6 +648,7 @@ int usb6fire_pcm_init(struct sfire_chip *chip)
 
        ret = snd_pcm_new(chip->card, "DMX6FireUSB", 0, 1, 1, &pcm);
        if (ret < 0) {
+               usb6fire_pcm_buffers_destroy(rt);
                kfree(rt);
                snd_printk(KERN_ERR PREFIX "cannot create pcm instance.\n");
                return ret;
@@ -625,6 +660,7 @@ int usb6fire_pcm_init(struct sfire_chip *chip)
        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_ops);
 
        if (ret) {
+               usb6fire_pcm_buffers_destroy(rt);
                kfree(rt);
                snd_printk(KERN_ERR PREFIX
                                "error preallocating pcm buffers.\n");
@@ -669,6 +705,9 @@ void usb6fire_pcm_abort(struct sfire_chip *chip)
 
 void usb6fire_pcm_destroy(struct sfire_chip *chip)
 {
-       kfree(chip->pcm);
+       struct pcm_runtime *rt = chip->pcm;
+
+       usb6fire_pcm_buffers_destroy(rt);
+       kfree(rt);
        chip->pcm = NULL;
 }

diff --git a/sound/usb/6fire/pcm.h b/sound/usb/6fire/pcm.h
index 9b01133ee3fe9c22d3f51557430f011846e5bc8a..f5779d6182c638b02253af7bc9ab73dfed7e1916 100644 (file)
--- a/sound/usb/6fire/pcm.h
+++ b/sound/usb/6fire/pcm.h
@@ -32,7 +32,7 @@ struct pcm_urb {
        struct urb instance;
        struct usb_iso_packet_descriptor packets[PCM_N_PACKETS_PER_URB];
        /* END DO NOT SEPARATE */
-       u8 buffer[PCM_N_PACKETS_PER_URB * PCM_MAX_PACKET_SIZE];
+       u8 *buffer;
 
        struct pcm_urb *peer;
 };