ASoC: keep pointer to resource so it can be freed

Add a new variable for storing resources accessed subsequent to the one
accessed using request_mem_region, so the one accessed using
request_mem_region can be released if needed.

The resource variable names are also changed to be more descriptive.

This code is also missing some calls to iounmap.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
expression E, E1;
identifier f;
statement S1,S2,S3;
@@

if (E == NULL)
{
  ... when != if (E == NULL || ...) S1 else S2
      when != E = E1
*E->f
  ... when any
  return ...;
}
else S3
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 13 insertions, 12 deletions

diff --git a/sound/soc/au1x/psc-ac97.c b/sound/soc/au1x/psc-ac97.c
index 172eefd..0c6acd5 100644
--- a/sound/soc/au1x/psc-ac97.c
+++ b/sound/soc/au1x/psc-ac97.c
@@ -364,7 +364,7 @@ static const struct snd_soc_dai_driver au1xpsc_ac97_dai_template = {
 static int __devinit au1xpsc_ac97_drvprobe(struct platform_device *pdev)
 {
 	int ret;
-	struct resource *r;
+	struct resource *iores, *dmares;
 	unsigned long sel;
 	struct au1xpsc_audio_data *wd;
 
@@ -374,29 +374,30 @@ static int __devinit au1xpsc_ac97_drvprobe(struct platform_device *pdev)
 
 	mutex_init(&wd->lock);
 
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!r) {
+	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!iores) {
 		ret = -ENODEV;
 		goto out0;
 	}
 
 	ret = -EBUSY;
-	if (!request_mem_region(r->start, resource_size(r), pdev->name))
+	if (!request_mem_region(iores->start, resource_size(iores),
+				pdev->name))
 		goto out0;
 
-	wd->mmio = ioremap(r->start, resource_size(r));
+	wd->mmio = ioremap(iores->start, resource_size(iores));
 	if (!wd->mmio)
 		goto out1;
 
-	r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
-	if (!r)
+	dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+	if (!dmares)
 		goto out2;
-	wd->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = r->start;
+	wd->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start;
 
-	r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
-	if (!r)
+	dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+	if (!dmares)
 		goto out2;
-	wd->dmaids[SNDRV_PCM_STREAM_CAPTURE] = r->start;
+	wd->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start;
 
 	/* configuration: max dma trigger threshold, enable ac97 */
 	wd->cfg = PSC_AC97CFG_RT_FIFO8 | PSC_AC97CFG_TT_FIFO8 |
@@ -428,7 +429,7 @@ static int __devinit au1xpsc_ac97_drvprobe(struct platform_device *pdev)
 out2:
 	iounmap(wd->mmio);
 out1:
-	release_mem_region(r->start, resource_size(r));
+	release_mem_region(iores->start, resource_size(iores));
 out0:
 	kfree(wd);
 	return ret;