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ARM: pxa: ssp: Check return values from phandle lookups 

Commit a6e56c28a1 (ARM: pxa: ssp: add DT bindings) causes warnings
when built:

arch/arm/plat-pxa/ssp.c: In function 'pxa_ssp_probe':
arch/arm/plat-pxa/ssp.c:145:17: warning: 'dma_spec.args[0]' may be used
	uninitialized in this function [-Wmaybe-uninitialized]

Resolve by checking return values and aborting when lookups fail.

Cc: Daniel Mack <zonque@gmail.com>
Cc: Mark Brown <broonie@linaro.org>
Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Olof Johansson 2013-09-05 12:30:52 -07:00
parent 6404141718
commit d5ece9373c
1 changed files with 14 additions and 4 deletions
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18
arch/arm/plat-pxa/ssp.c
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@ -132,6 +132,7 @@ static int pxa_ssp_probe(struct platform_device *pdev)
if (dev->of_node) {
struct of_phandle_args dma_spec;
struct device_node *np = dev->of_node;
int ret;
/*
* FIXME: we should allocate the DMA channel from this
@ -140,14 +141,23 @@ static int pxa_ssp_probe(struct platform_device *pdev)
*/
/* rx */
of_parse_phandle_with_args(np, "dmas", "#dma-cells",
0, &dma_spec);
ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells",
0, &dma_spec);
if (ret) {
dev_err(dev, "Can't parse dmas property\n");
return -ENODEV;
}
ssp->drcmr_rx = dma_spec.args[0];
of_node_put(dma_spec.np);
/* tx */
of_parse_phandle_with_args(np, "dmas", "#dma-cells",
1, &dma_spec);
ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells",
1, &dma_spec);
if (ret) {
dev_err(dev, "Can't parse dmas property\n");
return -ENODEV;
}
ssp->drcmr_tx = dma_spec.args[0];
of_node_put(dma_spec.np);
} else {