drivers/mmc: correct error-handling code

sdhci_alloc_host returns an ERR_PTR value in an error case instead of NULL.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@match exists@
expression x, E;
statement S1, S2;
@@

x = sdhci_alloc_host(...)
... when != x = E
(
*  if (x == NULL || ...) S1 else S2
|
*  if (x == NULL && ...) S1 else S2
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Acked-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Cc: Matt Fleming <matt@console-pimps.org>
Cc: Ian Molton <ian@mnementh.co.uk>
Cc: "Roberto A. Foglietta" <roberto.foglietta@gmail.com>
Cc: Philip Langdale <philipl@overt.org>
Cc: Pierre Ossman <pierre@ossman.eu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/mmc/host/sdhci-of.c b/drivers/mmc/host/sdhci-of.c
index 908844327db0ef3bb7dbf389d6d9e983a747ffe7..1e8aa590bb39b0a5e650037f61647860fd2b3ec1 100644 (file)
--- a/drivers/mmc/host/sdhci-of.c
+++ b/drivers/mmc/host/sdhci-of.c
@@ -234,7 +234,7 @@ static int __devinit sdhci_of_probe(struct of_device *ofdev,
                return -ENODEV;
 
        host = sdhci_alloc_host(&ofdev->dev, sizeof(*of_host));
-       if (!host)
+       if (IS_ERR(host))
                return -ENOMEM;
 
        of_host = sdhci_priv(host);