linux-kernel - [PATCH 2/6] drivers/cpufreq/pcc-cpufreq.c: fix error return code

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Date:	Sun,  5 Aug 2012 11:52:32 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	kernel-janitors@...r.kernel.org, cpufreq@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Julia Lawall <julia@...u.dk>
Subject: [PATCH 2/6] drivers/cpufreq/pcc-cpufreq.c: fix error return code

From: Julia Lawall <julia@...u.dk>

Convert a 0 error return code to a negative one, as returned elsewhere in the
function.

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

// <smpl>
@@
identifier ret;
expression e,e1,e2,e3,e4,x;
@@

(
if (\(ret != 0\|ret < 0\) || ...) { ... return ...; }
|
ret = 0
)
... when != ret = e1
*x = \(kmalloc\|kzalloc\|kcalloc\|devm_kzalloc\|ioremap\|ioremap_nocache\|devm_ioremap\|devm_ioremap_nocache\)(...);
... when != x = e2
    when != ret = e3
*if (x == NULL || ...)
{
  ... when != ret = e4
*  return ret;
}
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 drivers/cpufreq/pcc-cpufreq.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/cpufreq/pcc-cpufreq.c b/drivers/cpufreq/pcc-cpufreq.c
index cdc02ac..503996a 100644
--- a/drivers/cpufreq/pcc-cpufreq.c
+++ b/drivers/cpufreq/pcc-cpufreq.c
@@ -454,6 +454,7 @@ static int __init pcc_cpufreq_probe(void)
 					mem_resource->address_length);
 	if (pcch_virt_addr == NULL) {
 		pr_debug("probe: could not map shared mem region\n");
+		ret = -ENOMEM;
 		goto out_free;
 	}
 	pcch_hdr = pcch_virt_addr;

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