davinci oss: make s->pending_frags an atomic_t

sound/oss/davinci-audio-dma-intfc.c

-
 /*
  * linux/sound/oss/davinci-audio-dma-intfc.c
  *
@@ -213,6 +212,8 @@ int audio_setup_buf(audio_stream_t * s)
 	s->fragcount = 0;
 	s->prevbuf = 0;
 
+	if (s->wfc.done > 0)
+		BUG();
 	init_completion(&s->wfc);
 	s->wfc.done = s->nbfrags;
 
@@ -386,12 +387,12 @@ int audio_process_dma(audio_stream_t * s)
 	if (atomic_read(&s->stopped) == 1)
 		goto spin;
 
-	if (s->dma_spinref > 0 && s->pending_frags) {
+	if (s->dma_spinref > 0 && atomic_read(&s->pending_frags)) {
 		s->dma_spinref = 0;
 		DMA_CLEAR(s);
 	}
 
-	while (s->pending_frags) {
+	while (atomic_read(&s->pending_frags)) {
 		audio_buf_t *b = &s->buffers[s->dma_head];
 		u_int dma_size = s->fragsize - b->offset;
 
@@ -410,7 +411,7 @@ int audio_process_dma(audio_stream_t * s)
 		b->dma_ref++;
 		b->offset += dma_size;
 		if (b->offset >= s->fragsize) {
-			s->pending_frags--;
+			atomic_dec(&s->pending_frags);
 			if (++s->dma_head >= s->nbfrags)
 				s->dma_head = 0;
 		}
@@ -465,7 +466,7 @@ void audio_prime_rx(audio_state_t * state)
 		atomic_set(&os->spin_idle, 1);
 		audio_process_dma(os);
 	}
-	is->pending_frags = is->nbfrags;
+	atomic_set(&is->pending_frags, is->nbfrags);
 
 	init_completion(&is->wfc);
 	is->wfc.done = 0;
@@ -556,9 +557,9 @@ int audio_sync(struct file *file)
 		     }
 		if (++s->usr_head >= s->nbfrags)
 			s->usr_head = 0;
-
-		s->pending_frags++;
 		mutex_unlock(&state->mutex);
+
+		atomic_inc(&s->pending_frags);
 		audio_process_dma(s);
 	}
 
@@ -566,7 +567,7 @@ int audio_sync(struct file *file)
 	set_current_state(TASK_INTERRUPTIBLE);
 	add_wait_queue(&s->wq, &wait);
 
-	while ((s->pending_frags || (s->wfc.done < s->nbfrags))
+	while ((atomic_read(&s->pending_frags) || (s->wfc.done < s->nbfrags))
 	       && !signal_pending(current)) {
 		schedule();
 		set_current_state(TASK_INTERRUPTIBLE);
@@ -640,7 +641,7 @@ u_int audio_get_dma_pos(audio_stream_t * s)
 			offset = temp.dst - b->dma_addr;
 		if (offset >= s->fragsize)
 			offset = s->fragsize - 4;
-	} else if (s->pending_frags) {
+	} else if (atomic_read(&s->pending_frags)) {
 		offset = b->offset;
 	} else {
 		offset = 0;
@@ -669,7 +670,7 @@ void audio_reset(audio_stream_t * s)
 				b->dma_ref = 0;
 				b->offset = 0;
 			}
-			s->pending_frags++;
+			atomic_inc(&s->pending_frags);
 			if (s->dma_head == 0)
 				s->dma_head = s->nbfrags;
 			s->dma_head--;
@@ -683,7 +684,8 @@ void audio_reset(audio_stream_t * s)
 		s->buffers[s->dma_head].offset = 0;
 		s->buffers[s->usr_head].offset = 0;
 		s->usr_head = s->dma_head;
-		s->pending_frags = 0;
+		atomic_set(&s->pending_frags, 0);
+
 		init_completion(&s->wfc);
 		s->wfc.done = s->nbfrags;
 	}
@@ -841,7 +843,8 @@ static void audio_dsr_handler(unsigned long inData)
 		DPRINTK("Interrupt(%d)  for empty queue(h=%d, T=%d)???\n",
 			sound_curr_lch, s->dma_q_head, s->dma_q_tail);
 		DPRINTK("nbfrag=%d,pendfrags=%d,USR-H=%d, QH-%d QT-%d\n",
-			s->nbfrags, s->pending_frags, s->usr_head, s->dma_head,
+			s->nbfrags, atomic_read(&s->pending_frags),
+		        s->usr_head, s->dma_head,
 			s->dma_tail);
 		AUDIO_INCREMENT_HEAD(s);	/* Empty the queue */
 		FN_OUT(-1);
@@ -912,7 +915,7 @@ static void sound_dma_irq_handler(int sound_curr_lch, u16 ch_status, void *data)
 				if (!s->mapped) {
 					complete(&s->wfc);
 				} else
-					s->pending_frags++;
+					atomic_inc(&s->pending_frags);
 
 				wake_up(&s->wq);
 			}
@@ -972,7 +975,7 @@ static void audio_dma_callback(int lch, u16 ch_status, void *data)
 		if (!s->mapped) {
 			complete(&s->wfc);
 		} else
-			s->pending_frags++;
+			atomic_inc(&s->pending_frags);
 
 		wake_up(&s->wq);
 	}

sound/oss/davinci-audio.c

@@ -572,9 +572,11 @@ audio_write(struct file *file, const char *buffer, size_t count, loff_t * ppos)
 		b->offset = 0;
 		if (++s->usr_head >= s->nbfrags)
 			s->usr_head = 0;
-		/* Add the num of frags pending */
-		s->pending_frags++;
 		mutex_unlock(&state->mutex);
+
+		/* Add the num of frags pending */
+		atomic_inc(&s->pending_frags);
+
 		atomic_set(&s->active, 1);
 		audio_process_dma(s);
 	}
@@ -661,11 +663,13 @@ audio_read(struct file *file, char __user *buffer, size_t count, loff_t * ppos)
 		b->offset = 0;
 		if (++s->usr_head >= s->nbfrags)
 			s->usr_head = 0;
-
-		s->pending_frags++;
 		mutex_unlock(&state->mutex);
+
+		atomic_inc(&s->pending_frags);
+
 		DPRINTK(KERN_INFO
 			"calling audio_process_dma from audio_read\n");
+		atomic_set(&s->active, 1);
 		audio_process_dma(s);
 	}
 
@@ -912,9 +916,9 @@ audio_ioctl(struct inode *inode, struct file *file, uint cmd, ulong arg)
 					FN_OUT(14);
 					return -ENOMEM;
 				}
-				if (os->mapped && !os->pending_frags) {
+				if (os->mapped && !atomic_read(&os->pending_frags)) {
+					atomic_set(&os->pending_frags, os->nbfrags);
 					mutex_lock(&state->mutex);
-					os->pending_frags = os->nbfrags;
 					init_completion(&os->wfc);
 					os->wfc.done = 0;
 					mutex_unlock(&state->mutex);

sound/oss/davinci-audio.h

@@ -48,7 +48,7 @@ typedef struct {
 	u_int dma_tail;		/* DMA fragment index to complete */
 	u_int fragsize;		/* fragment i.e. buffer size */
 	u_int nbfrags;		/* nbr of fragments i.e. buffers */
-	u_int pending_frags;	/* Fragments sent to DMA */
+	atomic_t pending_frags;	/* Fragments sent to DMA */
 	int dma_dev;		/* device identifier for DMA */
 	u_int prevbuf;		/* Prev pending frag size sent to DMA */
 	atomic_t started;	/* to store if the chain was started or not */