ASoC: Clean up error handling in MPC5200 DMA setup

Error handling code following a kzalloc should free the allocated data.
Error handling code following an ioremap should iounmap the allocated data.

The semantic match that finds the first problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r exists@
local idexpression x;
statement S;
expression E;
identifier f,f1,l;
position p1,p2;
expression *ptr != NULL;
@@

x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...);
...
if (x == NULL) S
<... when != x
     when != if (...) { <+...x...+> }
(
x->f1 = E
|
 (x->f1 == NULL || ...)
|
 f(...,x->f1,...)
)
...>
(
 return \(0\|<+...x...+>\|ptr\);
|
 return@p2 ...;
)

@script:python@
p1 << r.p1;
p2 << r.p2;
@@

print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line)
// </smpl>

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

diff --git a/sound/soc/fsl/mpc5200_dma.c b/sound/soc/fsl/mpc5200_dma.c
index 9ff62e3..6096d22 100644 (file)
--- a/sound/soc/fsl/mpc5200_dma.c
+++ b/sound/soc/fsl/mpc5200_dma.c
@@ -447,6 +447,7 @@ int mpc5200_audio_dma_create(struct of_device *op)
        int size, irq, rc;
        const __be32 *prop;
        void __iomem *regs;
+       int ret;
 
        /* Fetch the registers and IRQ of the PSC */
        irq = irq_of_parse_and_map(op->node, 0);
@@ -463,14 +464,16 @@ int mpc5200_audio_dma_create(struct of_device *op)
        /* Allocate and initialize the driver private data */
        psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL);
        if (!psc_dma) {
-               iounmap(regs);
-               return -ENOMEM;
+               ret = -ENOMEM;
+               goto out_unmap;
        }
 
        /* Get the PSC ID */
        prop = of_get_property(op->node, "cell-index", &size);
-       if (!prop || size < sizeof *prop)
-               return -ENODEV;
+       if (!prop || size < sizeof *prop) {
+               ret = -ENODEV;
+               goto out_free;
+       }
 
        spin_lock_init(&psc_dma->lock);
        mutex_init(&psc_dma->mutex);
@@ -493,9 +496,8 @@ int mpc5200_audio_dma_create(struct of_device *op)
        if (!psc_dma->capture.bcom_task ||
            !psc_dma->playback.bcom_task) {
                dev_err(&op->dev, "Could not allocate bestcomm tasks\n");
-               iounmap(regs);
-               kfree(psc_dma);
-               return -ENODEV;
+               ret = -ENODEV;
+               goto out_free;
        }
 
        /* Disable all interrupts and reset the PSC */
@@ -537,12 +539,8 @@ int mpc5200_audio_dma_create(struct of_device *op)
                          &psc_dma_bcom_irq_tx, IRQF_SHARED,
                          "psc-dma-playback", &psc_dma->playback);
        if (rc) {
-               free_irq(psc_dma->irq, psc_dma);
-               free_irq(psc_dma->capture.irq,
-                        &psc_dma->capture);
-               free_irq(psc_dma->playback.irq,
-                        &psc_dma->playback);
-               return -ENODEV;
+               ret = -ENODEV;
+               goto out_irq;
        }
 
        /* Save what we've done so it can be found again later */
@@ -550,6 +548,15 @@ int mpc5200_audio_dma_create(struct of_device *op)
 
        /* Tell the ASoC OF helpers about it */
        return snd_soc_register_platform(&mpc5200_audio_dma_platform);
+out_irq:
+       free_irq(psc_dma->irq, psc_dma);
+       free_irq(psc_dma->capture.irq, &psc_dma->capture);
+       free_irq(psc_dma->playback.irq, &psc_dma->playback);
+out_free:
+       kfree(psc_dma);
+out_unmap:
+       iounmap(regs);
+       return ret;
 }
 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_create);