[PATCH 2/5] gpio/omap: Use devm_ API and add request_mem_region

On Thu, Feb 16, 2012 at 11:11:52AM +0530, DebBarma, Tarun Kanti wrote:

Hi Benoit,

On Wed, Feb 15, 2012 at 9:34 PM, Benoit Cousson [off-list ref] wrote:

quoted

Replace the regular kzalloc and ioremap with the devm_ equivalent
to simplify error handling.

Add the missing devm_request_mem_region to reserve the region used
by the driver.

Signed-off-by: Benoit Cousson <redacted>
Cc: Tarun Kanti DebBarma <redacted>
---
?drivers/gpio/gpio-omap.c | ? 35 +++++++++++++++--------------------
?1 files changed, 15 insertions(+), 20 deletions(-)

diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index a0c3e03..c3a9dc8 100644
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c

@@ -19,7 +19,7 @@

?#include <linux/err.h>
?#include <linux/clk.h>
?#include <linux/io.h>
-#include <linux/slab.h>
+#include <linux/device.h>
?#include <linux/pm_runtime.h>
?#include <linux/pm.h>

@@ -1052,23 +1052,19 @@ static int __devinit omap_gpio_probe(struct platform_device *pdev)

? ? ? ?struct gpio_bank *bank;
? ? ? ?int ret = 0;

- ? ? ? if (!dev->platform_data) {
- ? ? ? ? ? ? ? ret = -EINVAL;
- ? ? ? ? ? ? ? goto err_exit;
- ? ? ? }
+ ? ? ? if (!dev->platform_data)
+ ? ? ? ? ? ? ? return -EINVAL;

- ? ? ? bank = kzalloc(sizeof(struct gpio_bank), GFP_KERNEL);
+ ? ? ? bank = devm_kzalloc(&pdev->dev, sizeof(struct gpio_bank), GFP_KERNEL);
? ? ? ?if (!bank) {
? ? ? ? ? ? ? ?dev_err(dev, "Memory alloc failed\n");
- ? ? ? ? ? ? ? ret = -ENOMEM;
- ? ? ? ? ? ? ? goto err_exit;
+ ? ? ? ? ? ? ? return -ENOMEM;
? ? ? ?}

? ? ? ?res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
? ? ? ?if (unlikely(!res)) {
? ? ? ? ? ? ? ?dev_err(dev, "Invalid IRQ resource\n");
- ? ? ? ? ? ? ? ret = -ENODEV;
- ? ? ? ? ? ? ? goto err_free;
+ ? ? ? ? ? ? ? return -ENODEV;

How is the memory allocated to 'bank' getting freed before return -ENODEV?

The magic of devm_*() functions.  Anything allocated by those functions is
automatically freed on either probe failure or driver removal.

g.