[ 3.8.y.z extended stable ] Patch "ALSA: 6fire: make buffers DMA-able (pcm)" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

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

to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue

This patch is scheduled to be released in version 3.8.13.8.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.8.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 77cee2e1ce9221597a2dfd083c928901c08104b0 Mon Sep 17 00:00:00 2001
From: Torsten Schenk <torsten.schenk at zoho.com>
Date: Sun, 11 Aug 2013 11:11:19 +0200
Subject: ALSA: 6fire: make buffers DMA-able (pcm)

commit 5ece263f1d93fba8d992e67e3ab8a71acf674db9 upstream.

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

Signed-off-by: Torsten Schenk <torsten.schenk at zoho.com>
Signed-off-by: Takashi Iwai <tiwai at suse.de>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 sound/usb/6fire/pcm.c | 41 ++++++++++++++++++++++++++++++++++++++++-
 sound/usb/6fire/pcm.h |  2 +-
 2 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/sound/usb/6fire/pcm.c b/sound/usb/6fire/pcm.c
index 074aaf7..25f9e61 100644
--- a/sound/usb/6fire/pcm.c
+++ b/sound/usb/6fire/pcm.c
@@ -580,6 +580,33 @@ 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;
@@ -591,6 +618,13 @@ 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);
@@ -612,6 +646,7 @@ 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;
@@ -627,6 +662,7 @@ int usb6fire_pcm_init(struct sfire_chip *chip)
 			snd_dma_continuous_data(GFP_KERNEL),
 			MAX_BUFSIZE, MAX_BUFSIZE);
 	if (ret) {
+		usb6fire_pcm_buffers_destroy(rt);
 		kfree(rt);
 		snd_printk(KERN_ERR PREFIX
 				"error preallocating pcm buffers.\n");
@@ -671,6 +707,9 @@ 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 9b01133..f5779d6 100644
--- 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;
 };
--
1.8.1.2