In this code, 0 is returned on failure, even though other failures return -ENOMEM or other similar values.
A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/)
// <smpl> @a@ identifier alloc; identifier ret; constant C; expression x; @@
x = alloc(...); if (x == NULL) { <+... (ret = -C; | return -C; ) ...+> }
@@ identifier f, a.alloc; expression ret; expression x,e1,e2,e3; @@
ret = 0 ... when != ret = e1 *x = alloc(...) ... when != ret = e2 if (x == NULL) { ... when != ret = e3 return ret; } // </smpl>
Signed-off-by: Julia Lawall julia@diku.dk
--- Another call to platform_get_resource in the same function returns -ENODEV on error, so I have used that value.
sound/soc/davinci/davinci-mcasp.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c index c8e97dc..86918ee 100644 --- a/sound/soc/davinci/davinci-mcasp.c +++ b/sound/soc/davinci/davinci-mcasp.c @@ -898,6 +898,7 @@ static int davinci_mcasp_probe(struct platform_device *pdev) res = platform_get_resource(pdev, IORESOURCE_DMA, 0); if (!res) { dev_err(&pdev->dev, "no DMA resource\n"); + ret = -ENODEV; goto err_release_region; }
@@ -912,6 +913,7 @@ static int davinci_mcasp_probe(struct platform_device *pdev) res = platform_get_resource(pdev, IORESOURCE_DMA, 1); if (!res) { dev_err(&pdev->dev, "no DMA resource\n"); + ret = -ENODEV; goto err_release_region; }