mmc: mvsdio: use devm_ API to simplify/correct error paths.
Andrew Lunn [Wed, 16 Jan 2013 13:13:56 +0000 (14:13 +0100)]
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>

drivers/mmc/host/mvsdio.c

index de4c20b..f8dd361 100644 (file)
@@ -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;
@@ -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;
@@ -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;
 
@@ -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;
@@ -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;
                }
@@ -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;
 }
@@ -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;
 }