hwrng: xgene - fix handling platform_get_irq

The function can return negative value.

The problem has been detected using proposed semantic patch
scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci [1].

[1]: http://permalink.gmane.org/gmane.linux.kernel/2038576

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/char/hw_random/xgene-rng.c b/drivers/char/hw_random/xgene-rng.c
index c37cf75..3c77645 100644 (file)
--- a/drivers/char/hw_random/xgene-rng.c
+++ b/drivers/char/hw_random/xgene-rng.c
@@ -344,11 +344,12 @@ static int xgene_rng_probe(struct platform_device *pdev)
        if (IS_ERR(ctx->csr_base))
                return PTR_ERR(ctx->csr_base);
 
-       ctx->irq = platform_get_irq(pdev, 0);
-       if (ctx->irq < 0) {
+       rc = platform_get_irq(pdev, 0);
+       if (rc < 0) {
                dev_err(&pdev->dev, "No IRQ resource\n");
-               return ctx->irq;
+               return rc;
        }
+       ctx->irq = rc;
 
        dev_dbg(&pdev->dev, "APM X-Gene RNG BASE %p ALARM IRQ %d",
                ctx->csr_base, ctx->irq);