drivers/perf: arm-ccn: Use devm_ioremap_resource() to map memory

Instead of checking the return value of platform_get_resource(), we can
use devm_ioremap_resource() which has the NULL pointer check and the
memory region requesting. devm_ioremap_resource is designed to replace
calls to devm_request_mem_region followed by devm_ioremap, so let's use
the same.

Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

1 files changed, 3 insertions, 11 deletions

diff --git a/drivers/perf/arm-ccn.c b/drivers/perf/arm-ccn.c
index b416ee18e6bb..4b15c36f4631 100644
--- a/drivers/perf/arm-ccn.c
+++ b/drivers/perf/arm-ccn.c
@@ -1485,17 +1485,9 @@ static int arm_ccn_probe(struct platform_device *pdev)
         platform_set_drvdata(pdev, ccn);
 
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-        if (!res)
-                return -EINVAL;
-
-        if (!devm_request_mem_region(ccn->dev, res->start,
-                        resource_size(res), pdev->name))
-                return -EBUSY;
-
-        ccn->base = devm_ioremap(ccn->dev, res->start,
-                                resource_size(res));
-        if (!ccn->base)
-                return -EFAULT;
+        ccn->base = devm_ioremap_resource(ccn->dev, res);
+        if (IS_ERR(ccn->base))
+                return PTR_ERR(ccn->base);
 
         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
         if (!res)