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Message-Id: <1458186341-6970-4-git-send-email-david@lechnology.com>
Date: Wed, 16 Mar 2016 22:45:33 -0500
From: David Lechner <david@...hnology.com>
To: unlisted-recipients:; (no To-header on input)
Cc: David Lechner <david@...hnology.com>, Sekhar Nori <nsekhar@...com>,
Kevin Hilman <khilman@...nel.org>,
Russell King <linux@....linux.org.uk>,
Ulf Hansson <ulf.hansson@...aro.org>,
Jaehoon Chung <jh80.chung@...sung.com>,
Krzysztof Kozlowski <k.kozlowski.k@...il.com>,
Peter Ujfalusi <peter.ujfalusi@...com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-mmc@...r.kernel.org
Subject: [PATCH v3 3/5] mmc: davinci: fix unwinding in probe
Unwiding from an error in davinci_mmcsd_probe was a mess. Some errors were
not handled and not all paths unwound correctly. Also using devm_ where
possible to simplify things.
Signed-off-by: David Lechner <david@...hnology.com>
---
v3 changes: fixed ret = -ENODEV mistake. Updated to apply on top of patch from
Peter Ujfalusi.
drivers/mmc/host/davinci_mmc.c | 96 ++++++++++++++++--------------------------
1 file changed, 37 insertions(+), 59 deletions(-)
diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
index 498c42d..e75407d 100644
--- a/drivers/mmc/host/davinci_mmc.c
+++ b/drivers/mmc/host/davinci_mmc.c
@@ -1205,7 +1205,7 @@ static int __init davinci_mmcsd_probe(struct platform_device *pdev)
struct mmc_davinci_host *host = NULL;
struct mmc_host *mmc = NULL;
struct resource *r, *mem = NULL;
- int ret = 0, irq = 0;
+ int ret, irq;
size_t mem_size;
const struct platform_device_id *id_entry;
@@ -1215,38 +1215,38 @@ static int __init davinci_mmcsd_probe(struct platform_device *pdev)
return -ENOENT;
}
- ret = -ENODEV;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irq = platform_get_irq(pdev, 0);
if (!r || irq == NO_IRQ)
- goto out;
+ return -ENODEV;
- ret = -EBUSY;
mem_size = resource_size(r);
- mem = request_mem_region(r->start, mem_size, pdev->name);
+ mem = devm_request_mem_region(&pdev->dev, r->start, mem_size,
+ pdev->name);
if (!mem)
- goto out;
+ return -EBUSY;
- ret = -ENOMEM;
mmc = mmc_alloc_host(sizeof(struct mmc_davinci_host), &pdev->dev);
if (!mmc)
- goto out;
+ return -ENOMEM;
host = mmc_priv(mmc);
host->mmc = mmc; /* Important */
host->mem_res = mem;
- host->base = ioremap(mem->start, mem_size);
+ host->base = devm_ioremap(&pdev->dev, mem->start, mem_size);
if (!host->base)
- goto out;
+ goto ioremap_fail;
- ret = -ENXIO;
- 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);
- goto out;
+ goto clk_get_fail;
}
- clk_enable(host->clk);
+ ret = clk_enable(host->clk);
+ if (ret)
+ goto clk_enable_fail;
+
host->mmc_input_clk = clk_get_rate(host->clk);
init_mmcsd_host(host);
@@ -1264,7 +1264,7 @@ static int __init davinci_mmcsd_probe(struct platform_device *pdev)
if (host->use_dma) {
ret = davinci_acquire_dma_channels(host);
if (ret == -EPROBE_DEFER)
- goto out;
+ goto dma_probe_defer;
else if (ret)
host->use_dma = 0;
}
@@ -1321,15 +1321,17 @@ static int __init davinci_mmcsd_probe(struct platform_device *pdev)
ret = mmc_add_host(mmc);
if (ret < 0)
- goto out;
+ goto mmc_add_host_fail;
- ret = request_irq(irq, mmc_davinci_irq, 0, mmc_hostname(mmc), host);
+ ret = devm_request_irq(&pdev->dev, irq, mmc_davinci_irq, 0,
+ mmc_hostname(mmc), host);
if (ret)
- goto out;
+ goto request_irq_fail;
if (host->sdio_irq >= 0) {
- ret = request_irq(host->sdio_irq, mmc_davinci_sdio_irq, 0,
- mmc_hostname(mmc), host);
+ ret = devm_request_irq(&pdev->dev, host->sdio_irq,
+ mmc_davinci_sdio_irq, 0,
+ mmc_hostname(mmc), host);
if (!ret)
mmc->caps |= MMC_CAP_SDIO_IRQ;
}
@@ -1342,28 +1344,18 @@ static int __init davinci_mmcsd_probe(struct platform_device *pdev)
return 0;
-out:
+request_irq_fail:
+ mmc_remove_host(mmc);
+mmc_add_host_fail:
mmc_davinci_cpufreq_deregister(host);
cpu_freq_fail:
- if (host) {
- davinci_release_dma_channels(host);
-
- if (host->clk) {
- clk_disable(host->clk);
- clk_put(host->clk);
- }
-
- if (host->base)
- iounmap(host->base);
- }
-
- if (mmc)
- mmc_free_host(mmc);
-
- if (mem)
- release_resource(mem);
-
- dev_dbg(&pdev->dev, "probe err %d\n", ret);
+ davinci_release_dma_channels(host);
+dma_probe_defer:
+ clk_disable(host->clk);
+clk_enable_fail:
+clk_get_fail:
+ioremap_fail:
+ mmc_free_host(mmc);
return ret;
}
@@ -1372,25 +1364,11 @@ static int __exit davinci_mmcsd_remove(struct platform_device *pdev)
{
struct mmc_davinci_host *host = platform_get_drvdata(pdev);
- if (host) {
- mmc_davinci_cpufreq_deregister(host);
-
- mmc_remove_host(host->mmc);
- free_irq(host->mmc_irq, host);
- if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
- free_irq(host->sdio_irq, host);
-
- davinci_release_dma_channels(host);
-
- clk_disable(host->clk);
- clk_put(host->clk);
-
- iounmap(host->base);
-
- release_resource(host->mem_res);
-
- mmc_free_host(host->mmc);
- }
+ mmc_remove_host(host->mmc);
+ mmc_davinci_cpufreq_deregister(host);
+ davinci_release_dma_channels(host);
+ clk_disable(host->clk);
+ mmc_free_host(host->mmc);
return 0;
}
--
1.9.1
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