ALSA: gus: Use guard() for mutex locks

Replace the manual mutex lock/unlock pairs with guard() for code
simplification.

As replaced with the guard(mutex), no longer used snd_gf1_mem_lock()
is dropped, too.

Only code refactoring, and no behavior change.

Signed-off-by: Takashi Iwai <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

include/sound/gus.h

···
 
 /* gus_mem.c */
 
-void snd_gf1_mem_lock(struct snd_gf1_mem * alloc, int xup);
 int snd_gf1_mem_xfree(struct snd_gf1_mem * alloc, struct snd_gf1_mem_block * block);
 struct snd_gf1_mem_block *snd_gf1_mem_alloc(struct snd_gf1_mem * alloc, int owner,
 				       char *name, int size, int w_16,

sound/isa/gus/gus_dma.c

···
 
 int snd_gf1_dma_init(struct snd_gus_card * gus)
 {
-	mutex_lock(&gus->dma_mutex);
+	guard(mutex)(&gus->dma_mutex);
 	gus->gf1.dma_shared++;
-	if (gus->gf1.dma_shared > 1) {
-		mutex_unlock(&gus->dma_mutex);
+	if (gus->gf1.dma_shared > 1)
 		return 0;
-	}
 	gus->gf1.interrupt_handler_dma_write = snd_gf1_dma_interrupt;
 	gus->gf1.dma_data_pcm = 
 	gus->gf1.dma_data_pcm_last =
 	gus->gf1.dma_data_synth = 
 	gus->gf1.dma_data_synth_last = NULL;
-	mutex_unlock(&gus->dma_mutex);
 	return 0;
 }
 
···
 {
 	struct snd_gf1_dma_block *block;
 
-	mutex_lock(&gus->dma_mutex);
+	guard(mutex)(&gus->dma_mutex);
 	gus->gf1.dma_shared--;
 	if (!gus->gf1.dma_shared) {
 		snd_dma_disable(gus->gf1.dma1);
···
 		gus->gf1.dma_data_pcm_last =
 		gus->gf1.dma_data_synth_last = NULL;
 	}
-	mutex_unlock(&gus->dma_mutex);
 	return 0;
 }
 

sound/isa/gus/gus_main.c

···
 EXPORT_SYMBOL(snd_gf1_mem_alloc);
 EXPORT_SYMBOL(snd_gf1_mem_xfree);
 EXPORT_SYMBOL(snd_gf1_mem_free);
-EXPORT_SYMBOL(snd_gf1_mem_lock);

sound/isa/gus/gus_mem.c

···
 				  struct snd_info_buffer *buffer);
 #endif
 
-void snd_gf1_mem_lock(struct snd_gf1_mem * alloc, int xup)
-{
-	if (!xup) {
-		mutex_lock(&alloc->memory_mutex);
-	} else {
-		mutex_unlock(&alloc->memory_mutex);
-	}
-}
-
 static struct snd_gf1_mem_block *
 snd_gf1_mem_xalloc(struct snd_gf1_mem *alloc, struct snd_gf1_mem_block *block,
 		   const char *name)
···
 				alloc->first = nblock;
 			else
 				nblock->prev->next = nblock;
-			mutex_unlock(&alloc->memory_mutex);
 			return nblock;
 		}
 		pblock = pblock->next;
···
 {
 	if (block->share) {	/* ok.. shared block */
 		block->share--;
-		mutex_unlock(&alloc->memory_mutex);
 		return 0;
 	}
 	if (alloc->first == block) {
···
 {
 	struct snd_gf1_mem_block block, *nblock;
 
-	snd_gf1_mem_lock(alloc, 0);
+	guard(mutex)(&alloc->memory_mutex);
 	if (share_id != NULL) {
 		nblock = snd_gf1_mem_share(alloc, share_id);
 		if (nblock != NULL) {
···
 				goto __std;
 			}
 			nblock->share++;
-			snd_gf1_mem_lock(alloc, 1);
 			return NULL;
 		}
 	}
       __std:
-	if (snd_gf1_mem_find(alloc, &block, size, w_16, align) < 0) {
-		snd_gf1_mem_lock(alloc, 1);
+	if (snd_gf1_mem_find(alloc, &block, size, w_16, align) < 0)
 		return NULL;
-	}
 	if (share_id != NULL)
 		memcpy(&block.share_id, share_id, sizeof(block.share_id));
 	block.owner = owner;
 	nblock = snd_gf1_mem_xalloc(alloc, &block, name);
-	snd_gf1_mem_lock(alloc, 1);
 	return nblock;
 }
 
 int snd_gf1_mem_free(struct snd_gf1_mem * alloc, unsigned int address)
 {
-	int result;
 	struct snd_gf1_mem_block *block;
 
-	snd_gf1_mem_lock(alloc, 0);
+	guard(mutex)(&alloc->memory_mutex);
 	block = snd_gf1_mem_look(alloc, address);
-	if (block) {
-		result = snd_gf1_mem_xfree(alloc, block);
-		snd_gf1_mem_lock(alloc, 1);
-		return result;
-	}
-	snd_gf1_mem_lock(alloc, 1);
+	if (block)
+		return snd_gf1_mem_xfree(alloc, block);
 	return -EINVAL;
 }
 
···
 
 	gus = entry->private_data;
 	alloc = &gus->gf1.mem_alloc;
-	mutex_lock(&alloc->memory_mutex);
+	guard(mutex)(&alloc->memory_mutex);
 	snd_iprintf(buffer, "8-bit banks       : \n    ");
 	for (i = 0; i < 4; i++)
 		snd_iprintf(buffer, "0x%06x (%04ik)%s", alloc->banks_8[i].address, alloc->banks_8[i].size >> 10, i + 1 < 4 ? "," : "");
···
 	}
 	snd_iprintf(buffer, "  Total: memory = %i, used = %i, free = %i\n",
 		    total, used, total - used);
-	mutex_unlock(&alloc->memory_mutex);
 #if 0
 	ultra_iprintf(buffer, "  Verify: free = %i, max 8-bit block = %i, max 16-bit block = %i\n",
 		      ultra_memory_free_size(card, &card->gf1.mem_alloc),