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mmc: mvsdio: use devm_ API to simplify/correct error paths.
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There are a number of bugs in the error paths of this driver.  Make
use of devm_ functions to simplify the cleanup on error.

Based on a patch by Russell King.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
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@lunn
lunn authored and Jason Cooper committed Jan 23, 2013
1 parent d6f620a commit f42abc7
Showing 1 changed file with 30 additions and 62 deletions.
92 changes: 30 additions & 62 deletions drivers/mmc/host/mvsdio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -50,8 +50,6 @@ struct mvsd_host {
struct timer_list timer;
struct mmc_host *mmc;
struct device *dev;
struct resource *res;
int irq;
struct clk *clk;
int gpio_card_detect;
int gpio_write_protect;
Expand Down Expand Up @@ -718,10 +716,6 @@ static int __init mvsd_probe(struct platform_device *pdev)
if (!r || irq < 0 || !mvsd_data)
return -ENXIO;

r = request_mem_region(r->start, SZ_1K, DRIVER_NAME);
if (!r)
return -EBUSY;

mmc = mmc_alloc_host(sizeof(struct mvsd_host), &pdev->dev);
if (!mmc) {
ret = -ENOMEM;
Expand All @@ -731,8 +725,8 @@ static int __init mvsd_probe(struct platform_device *pdev)
host = mmc_priv(mmc);
host->mmc = mmc;
host->dev = &pdev->dev;
host->res = r;
host->base_clock = mvsd_data->clock / 2;
host->clk = ERR_PTR(-EINVAL);

mmc->ops = &mvsd_ops;

Expand All @@ -752,7 +746,7 @@ static int __init mvsd_probe(struct platform_device *pdev)

spin_lock_init(&host->lock);

host->base = ioremap(r->start, SZ_4K);
host->base = devm_request_and_ioremap(&pdev->dev, r);
if (!host->base) {
ret = -ENOMEM;
goto out;
Expand All @@ -765,44 +759,45 @@ static int __init mvsd_probe(struct platform_device *pdev)

mvsd_power_down(host);

ret = request_irq(irq, mvsd_irq, 0, DRIVER_NAME, host);
ret = devm_request_irq(&pdev->dev, irq, mvsd_irq, 0, DRIVER_NAME, host);
if (ret) {
pr_err("%s: cannot assign irq %d\n", DRIVER_NAME, irq);
goto out;
} else
host->irq = irq;
}

/* Not all platforms can gate the clock, so it is not
an error if the clock does not exists. */
host->clk = clk_get(&pdev->dev, NULL);
if (!IS_ERR(host->clk)) {
host->clk = devm_clk_get(&pdev->dev, NULL);
if (!IS_ERR(host->clk))
clk_prepare_enable(host->clk);
}

if (mvsd_data->gpio_card_detect) {
ret = gpio_request(mvsd_data->gpio_card_detect,
DRIVER_NAME " cd");
ret = devm_gpio_request_one(&pdev->dev,
mvsd_data->gpio_card_detect,
GPIOF_IN, DRIVER_NAME " cd");
if (ret == 0) {
gpio_direction_input(mvsd_data->gpio_card_detect);
irq = gpio_to_irq(mvsd_data->gpio_card_detect);
ret = request_irq(irq, mvsd_card_detect_irq,
IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING,
DRIVER_NAME " cd", host);
ret = devm_request_irq(&pdev->dev, irq,
mvsd_card_detect_irq,
IRQ_TYPE_EDGE_RISING |
IRQ_TYPE_EDGE_FALLING,
DRIVER_NAME " cd", host);
if (ret == 0)
host->gpio_card_detect =
mvsd_data->gpio_card_detect;
else
gpio_free(mvsd_data->gpio_card_detect);
devm_gpio_free(&pdev->dev,
mvsd_data->gpio_card_detect);
}
}
if (!host->gpio_card_detect)
mmc->caps |= MMC_CAP_NEEDS_POLL;

if (mvsd_data->gpio_write_protect) {
ret = gpio_request(mvsd_data->gpio_write_protect,
DRIVER_NAME " wp");
ret = devm_gpio_request_one(&pdev->dev,
mvsd_data->gpio_write_protect,
GPIOF_IN, DRIVER_NAME " wp");
if (ret == 0) {
gpio_direction_input(mvsd_data->gpio_write_protect);
host->gpio_write_protect =
mvsd_data->gpio_write_protect;
}
Expand All @@ -824,26 +819,11 @@ static int __init mvsd_probe(struct platform_device *pdev)
return 0;

out:
if (host) {
if (host->irq)
free_irq(host->irq, host);
if (host->gpio_card_detect) {
free_irq(gpio_to_irq(host->gpio_card_detect), host);
gpio_free(host->gpio_card_detect);
}
if (host->gpio_write_protect)
gpio_free(host->gpio_write_protect);
if (host->base)
iounmap(host->base);
}
if (r)
release_resource(r);
if (mmc)
if (!IS_ERR_OR_NULL(host->clk)) {
if (mmc) {
if (!IS_ERR(host->clk))
clk_disable_unprepare(host->clk);
clk_put(host->clk);
}
mmc_free_host(mmc);
}

return ret;
}
Expand All @@ -852,28 +832,16 @@ static int __exit mvsd_remove(struct platform_device *pdev)
{
struct mmc_host *mmc = platform_get_drvdata(pdev);

if (mmc) {
struct mvsd_host *host = mmc_priv(mmc);
struct mvsd_host *host = mmc_priv(mmc);

if (host->gpio_card_detect) {
free_irq(gpio_to_irq(host->gpio_card_detect), host);
gpio_free(host->gpio_card_detect);
}
mmc_remove_host(mmc);
free_irq(host->irq, host);
if (host->gpio_write_protect)
gpio_free(host->gpio_write_protect);
del_timer_sync(&host->timer);
mvsd_power_down(host);
iounmap(host->base);
release_resource(host->res);
mmc_remove_host(mmc);
del_timer_sync(&host->timer);
mvsd_power_down(host);

if (!IS_ERR(host->clk))
clk_disable_unprepare(host->clk);
mmc_free_host(mmc);

if (!IS_ERR(host->clk)) {
clk_disable_unprepare(host->clk);
clk_put(host->clk);
}
mmc_free_host(mmc);
}
platform_set_drvdata(pdev, NULL);
return 0;
}
Expand Down

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