Re: [PATCH] mmc: wmt-sdmmc: fix unmatched release_mem_region

[lautriv <lautriv@coldplug.net>]

 From b0509e27e33326e6dccd67d8ebe67e2bdb0cfdde Mon Sep 17 00:00:00 2001
From: Helmut Stengele <lautriv@coldplug.net>
Date: Thu, 20 Nov 2014 15:27:40 +0100
Subject: [PATCH] mmc: wmt-sdmmc: fix unmatched release_mem_region

Current code calls release_mem_region upon module unload
without requesting the region first. This patch fixes it
by moving to a devres-based ioremap implementation, which
handles requesting and releasing memory region internally.

This also makes the error/unload paths a bit simpler.

Signed-off-by: Helmut Stengele <lautriv@coldplug.net>
---

This is a corrected patch based on the one Alexey sent for me.
I sent it already but since i'm not used to send something upstream
it was an attached file and obviously rejected.
Patch is tested on bare-metal ( wm8850 ) and works like suspected.

  drivers/mmc/host/wmt-sdmmc.c | 14 +++++---------
  1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/mmc/host/wmt-sdmmc.c b/drivers/mmc/host/wmt-sdmmc.c
index 54181b4..bcaa0cc 100644
--- a/drivers/mmc/host/wmt-sdmmc.c
+++ b/drivers/mmc/host/wmt-sdmmc.c
@@ -759,6 +759,7 @@ static int wmt_mci_probe(struct platform_device *pdev)
      const struct wmt_mci_caps *wmt_caps;
      int ret;
      int regular_irq, dma_irq;
+    struct resource *res;

      if (!of_id || !of_id->data) {
          dev_err(&pdev->dev, "Controller capabilities data missing\n");
@@ -813,10 +814,11 @@ static int wmt_mci_probe(struct platform_device *pdev)
      if (of_get_property(np, "cd-inverted", NULL))
          priv->cd_inverted = 1;

-    priv->sdmmc_base = of_iomap(np, 0);
+    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+    priv->sdmmc_base = devm_ioremap_resource(&pdev->dev, res);
      if (!priv->sdmmc_base) {
          dev_err(&pdev->dev, "Failed to map IO space\n");
-        ret = -ENOMEM;
+        ret = PTR_ERR(priv->sdmmc_base);
          goto fail2;
      }

@@ -826,7 +828,7 @@ static int wmt_mci_probe(struct platform_device *pdev)
      ret = request_irq(regular_irq, wmt_mci_regular_isr, 0, "sdmmc", priv);
      if (ret) {
          dev_err(&pdev->dev, "Register regular IRQ fail\n");
-        goto fail3;
+        goto fail2;
      }

      ret = request_irq(dma_irq, wmt_mci_dma_isr, 0, "sdmmc", priv);
@@ -869,8 +871,6 @@ fail5:
      free_irq(dma_irq, priv);
  fail4:
      free_irq(regular_irq, priv);
-fail3:
-    iounmap(priv->sdmmc_base);
  fail2:
      mmc_free_host(mmc);
  fail1:
@@ -881,7 +881,6 @@ static int wmt_mci_remove(struct platform_device *pdev)
  {
      struct mmc_host *mmc;
      struct wmt_mci_priv *priv;
-    struct resource *res;
      u32 reg_tmp;

      mmc = platform_get_drvdata(pdev);
@@ -909,9 +908,6 @@ static int wmt_mci_remove(struct platform_device *pdev)
      clk_disable_unprepare(priv->clk_sdmmc);
      clk_put(priv->clk_sdmmc);

-    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-    release_mem_region(res->start, resource_size(res));
-
      mmc_free_host(mmc);

      dev_info(&pdev->dev, "WMT MCI device removed\n");
-- 
2.1.3