[PATCH v3 4/5] i2c: pca-platform: use device managed allocations

From: Chris Packham
Date: Sun Jun 25 2017 - 20:45:31 EST


Switch to using the devm_ APIs and remove the now unnecessary error
handling and most of the device removal code.

Signed-off-by: Chris Packham <chris.packham@xxxxxxxxxxxxxxxxxxx>
---
drivers/i2c/busses/i2c-pca-platform.c | 53 +++++++----------------------------
1 file changed, 10 insertions(+), 43 deletions(-)

diff --git a/drivers/i2c/busses/i2c-pca-platform.c b/drivers/i2c/busses/i2c-pca-platform.c
index a6df6b8d2289..7db481cbf402 100644
--- a/drivers/i2c/busses/i2c-pca-platform.c
+++ b/drivers/i2c/busses/i2c-pca-platform.c
@@ -143,35 +143,23 @@ static int i2c_pca_pf_probe(struct platform_device *pdev)
int ret = 0;
int irq;

- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irq = platform_get_irq(pdev, 0);
/* If irq is 0, we do polling. */
if (irq < 0)
irq = 0;

- if (res == NULL) {
- ret = -ENODEV;
- goto e_print;
- }
+ i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
+ if (!i2c)
+ return -ENOMEM;

- if (!request_mem_region(res->start, resource_size(res), res->name)) {
- ret = -ENOMEM;
- goto e_print;
- }
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ i2c->reg_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(i2c->reg_base))
+ return PTR_ERR(i2c->reg_base);

- i2c = kzalloc(sizeof(struct i2c_pca_pf_data), GFP_KERNEL);
- if (!i2c) {
- ret = -ENOMEM;
- goto e_alloc;
- }

init_waitqueue_head(&i2c->wait);

- i2c->reg_base = ioremap(res->start, resource_size(res));
- if (!i2c->reg_base) {
- ret = -ENOMEM;
- goto e_remap;
- }
i2c->io_base = res->start;
i2c->io_size = resource_size(res);
i2c->irq = irq;
@@ -236,15 +224,14 @@ static int i2c_pca_pf_probe(struct platform_device *pdev)
}

if (irq) {
- ret = request_irq(irq, i2c_pca_pf_handler,
+ ret = devm_request_irq(&pdev->dev, irq, i2c_pca_pf_handler,
IRQF_TRIGGER_FALLING, pdev->name, i2c);
if (ret)
- goto e_reqirq;
+ return ret;
}

if (i2c_pca_add_numbered_bus(&i2c->adap) < 0) {
- ret = -ENODEV;
- goto e_adapt;
+ return -ENODEV;
}

platform_set_drvdata(pdev, i2c);
@@ -252,19 +239,6 @@ static int i2c_pca_pf_probe(struct platform_device *pdev)
printk(KERN_INFO "%s registered.\n", i2c->adap.name);

return 0;
-
-e_adapt:
- if (irq)
- free_irq(irq, i2c);
-e_reqirq:
- iounmap(i2c->reg_base);
-e_remap:
- kfree(i2c);
-e_alloc:
- release_mem_region(res->start, resource_size(res));
-e_print:
- printk(KERN_ERR "Registering PCA9564/PCA9665 FAILED! (%d)\n", ret);
- return ret;
}

static int i2c_pca_pf_remove(struct platform_device *pdev)
@@ -273,13 +247,6 @@ static int i2c_pca_pf_remove(struct platform_device *pdev)

i2c_del_adapter(&i2c->adap);

- if (i2c->irq)
- free_irq(i2c->irq, i2c);
-
- iounmap(i2c->reg_base);
- release_mem_region(i2c->io_base, i2c->io_size);
- kfree(i2c);
-
return 0;
}

--
2.13.0