mmc: pxamci: fix the device-tree probe deferral path

When the gpio driver is probed after the mmc one, the read/write gpio
and card detection one return -EPROBE_DEFER. Unfortunately, the memory
region remains requested, and upon the next probe, the probe will fail
anyway with -EBUSY.

Fix this by releasing the memory resource upon probe failure.

More broadly, this patch uses devm_*() primitives whenever possible in
the probe function.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
index 28a057f..da82477 100644 (file)
--- a/drivers/mmc/host/pxamci.c
+++ b/drivers/mmc/host/pxamci.c
@@ -86,7 +86,7 @@ struct pxamci_host {
 static inline void pxamci_init_ocr(struct pxamci_host *host)
 {
 #ifdef CONFIG_REGULATOR
-       host->vcc = regulator_get_optional(mmc_dev(host->mmc), "vmmc");
+       host->vcc = devm_regulator_get_optional(mmc_dev(host->mmc), "vmmc");
 
        if (IS_ERR(host->vcc))
                host->vcc = NULL;
@@ -654,12 +654,8 @@ static int pxamci_probe(struct platform_device *pdev)
 
        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        irq = platform_get_irq(pdev, 0);
-       if (!r || irq < 0)
-               return -ENXIO;
-
-       r = request_mem_region(r->start, SZ_4K, DRIVER_NAME);
-       if (!r)
-               return -EBUSY;
+       if (irq < 0)
+               return irq;
 
        mmc = mmc_alloc_host(sizeof(struct pxamci_host), &pdev->dev);
        if (!mmc) {
@@ -695,7 +691,7 @@ static int pxamci_probe(struct platform_device *pdev)
        host->pdata = pdev->dev.platform_data;
        host->clkrt = CLKRT_OFF;
 
-       host->clk = clk_get(&pdev->dev, NULL);
+       host->clk = devm_clk_get(&pdev->dev, NULL);
        if (IS_ERR(host->clk)) {
                ret = PTR_ERR(host->clk);
                host->clk = NULL;
@@ -727,9 +723,9 @@ static int pxamci_probe(struct platform_device *pdev)
        host->irq = irq;
        host->imask = MMC_I_MASK_ALL;
 
-       host->base = ioremap(r->start, SZ_4K);
-       if (!host->base) {
-               ret = -ENOMEM;
+       host->base = devm_ioremap_resource(&pdev->dev, r);
+       if (IS_ERR(host->base)) {
+               ret = PTR_ERR(host->base);
                goto out;
        }
 
@@ -742,7 +738,8 @@ static int pxamci_probe(struct platform_device *pdev)
        writel(64, host->base + MMC_RESTO);
        writel(host->imask, host->base + MMC_I_MASK);
 
-       ret = request_irq(host->irq, pxamci_irq, 0, DRIVER_NAME, host);
+       ret = devm_request_irq(&pdev->dev, host->irq, pxamci_irq, 0,
+                              DRIVER_NAME, host);
        if (ret)
                goto out;
 
@@ -833,14 +830,9 @@ out:
                        dma_release_channel(host->dma_chan_rx);
                if (host->dma_chan_tx)
                        dma_release_channel(host->dma_chan_tx);
-               if (host->base)
-                       iounmap(host->base);
-               if (host->clk)
-                       clk_put(host->clk);
        }
        if (mmc)
                mmc_free_host(mmc);
-       release_resource(r);
        return ret;
 }
 
@@ -859,9 +851,6 @@ static int pxamci_remove(struct platform_device *pdev)
                        gpio_ro = host->pdata->gpio_card_ro;
                        gpio_power = host->pdata->gpio_power;
                }
-               if (host->vcc)
-                       regulator_put(host->vcc);
-
                if (host->pdata && host->pdata->exit)
                        host->pdata->exit(&pdev->dev, mmc);
 
@@ -870,16 +859,10 @@ static int pxamci_remove(struct platform_device *pdev)
                       END_CMD_RES|PRG_DONE|DATA_TRAN_DONE,
                       host->base + MMC_I_MASK);
 
-               free_irq(host->irq, host);
                dmaengine_terminate_all(host->dma_chan_rx);
                dmaengine_terminate_all(host->dma_chan_tx);
                dma_release_channel(host->dma_chan_rx);
                dma_release_channel(host->dma_chan_tx);
-               iounmap(host->base);
-
-               clk_put(host->clk);
-
-               release_resource(host->res);
 
                mmc_free_host(mmc);
        }