On 02/11/2014 01:10 PM, Jingoo Han wrote:
Use devm_ioremap_resource() in order to make the code simpler,
and move 'struct resource *mem' from 'struct jz4740_hwmon' to
jz4740_hwmon_probe() because the 'mem' variable is used only in
jz4740_hwmon_probe(). Also the redundant return value check of
platform_get_resource() is removed, because the value is checked
by devm_ioremap_resource().
Signed-off-by: Jingoo Han <jg1.han@xxxxxxxxxxx>
Acked-by: Lars-Peter Clausen <lars@xxxxxxxxxx>
---
drivers/hwmon/jz4740-hwmon.c | 25 +++++--------------------
1 file changed, 5 insertions(+), 20 deletions(-)
diff --git a/drivers/hwmon/jz4740-hwmon.c b/drivers/hwmon/jz4740-hwmon.c
index a183e48..7488e36 100644
--- a/drivers/hwmon/jz4740-hwmon.c
+++ b/drivers/hwmon/jz4740-hwmon.c
@@ -28,7 +28,6 @@
#include <linux/hwmon.h>
struct jz4740_hwmon {
- struct resource *mem;
void __iomem *base;
int irq;
@@ -106,6 +105,7 @@ static int jz4740_hwmon_probe(struct platform_device *pdev)
{
int ret;
struct jz4740_hwmon *hwmon;
+ struct resource *mem;
hwmon = devm_kzalloc(&pdev->dev, sizeof(*hwmon), GFP_KERNEL);
if (!hwmon)
@@ -120,25 +120,10 @@ static int jz4740_hwmon_probe(struct platform_device *pdev)
return hwmon->irq;
}
- hwmon->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!hwmon->mem) {
- dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
- return -ENOENT;
- }
-
- hwmon->mem = devm_request_mem_region(&pdev->dev, hwmon->mem->start,
- resource_size(hwmon->mem), pdev->name);
- if (!hwmon->mem) {
- dev_err(&pdev->dev, "Failed to request mmio memory region\n");
- return -EBUSY;
- }
-
- hwmon->base = devm_ioremap_nocache(&pdev->dev, hwmon->mem->start,
- resource_size(hwmon->mem));
- if (!hwmon->base) {
- dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
- return -EBUSY;
- }
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ hwmon->base = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(hwmon->base))
+ return PTR_ERR(hwmon->base);
init_completion(&hwmon->read_completion);
mutex_init(&hwmon->lock);
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