[PATCH 2/4] s3cmci: enable the gpio_detect interrupt only after everything else is ready

[Cesar Eduardo Barros]

My GTA01 2.6.26 kernel was crashing within mmc_power_up(), at the first
call to mmc_set_ios(host), due to host->ops being NULL. mmc_power_up()
was being called by mmc_rescan().

The only possible call path I can imagine for that is s3cmci_irq_cd
getting called before host->ops is set, thus calling mmc_detect_change()
which will schedule host->detect which is mmc_rescan.

This patch avoids the problem by moving the enable of the gpio_detect
interrupt to just before calling mmc_add_host(), where everything else
is already set up.

Signed-off-by: Cesar Eduardo Barros <[EMAIL PROTECTED]>
---
 drivers/mmc/host/s3cmci.c |   34 +++++++++++++++++-----------------
 1 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/mmc/host/s3cmci.c b/drivers/mmc/host/s3cmci.c
index 9ef4d5b..107847a 100644
--- a/drivers/mmc/host/s3cmci.c
+++ b/drivers/mmc/host/s3cmci.c
@@ -1226,17 +1226,6 @@ static int s3cmci_probe(struct platform_device *pdev, 
int is2440)
 
        disable_irq(host->irq);
 
-       s3c2410_gpio_cfgpin(host->pdata->gpio_detect, S3C2410_GPIO_IRQ);
-       set_irq_type(host->irq_cd, IRQT_BOTHEDGE);
-
-       if (request_irq(host->irq_cd, s3cmci_irq_cd, 0, DRIVER_NAME, host)) {
-               dev_err(&pdev->dev,
-                       "failed to request card detect interrupt.\n");
-
-               ret = -ENOENT;
-               goto probe_free_irq;
-       }
-
        if (host->pdata->gpio_wprotect)
                s3c2410_gpio_cfgpin(host->pdata->gpio_wprotect,
                                    S3C2410_GPIO_INPUT);
@@ -1244,7 +1233,7 @@ static int s3cmci_probe(struct platform_device *pdev, int 
is2440)
        if (s3c2410_dma_request(host->dma, &s3cmci_dma_client, NULL)) {
                dev_err(&pdev->dev, "unable to get DMA channel.\n");
                ret = -EBUSY;
-               goto probe_free_irq_cd;
+               goto probe_free_irq;
        }
 
        host->clk = clk_get(&pdev->dev, "sdi");
@@ -1281,10 +1270,21 @@ static int s3cmci_probe(struct platform_device *pdev, 
int is2440)
            "irq_cd:%u dma:%u.\n", (host->is2440?"2440":""),
            host->base, host->irq, host->irq_cd, host->dma);
 
+       s3c2410_gpio_cfgpin(host->pdata->gpio_detect, S3C2410_GPIO_IRQ);
+       set_irq_type(host->irq_cd, IRQT_BOTHEDGE);
+
+       if (request_irq(host->irq_cd, s3cmci_irq_cd, 0, DRIVER_NAME, host)) {
+               dev_err(&pdev->dev,
+                       "failed to request card detect interrupt.\n");
+
+               ret = -ENOENT;
+               goto probe_disable_clk;
+       }
+
        ret = mmc_add_host(mmc);
        if (ret) {
                dev_err(&pdev->dev, "failed to add mmc host.\n");
-               goto probe_disable_clk;
+               goto probe_free_irq_cd;
        }
 
        platform_set_drvdata(pdev, mmc);
@@ -1292,15 +1292,15 @@ static int s3cmci_probe(struct platform_device *pdev, 
int is2440)
        dev_info(&pdev->dev, "initialisation done.\n");
        return 0;
 
+ probe_free_irq_cd:
+       free_irq(host->irq_cd, host);
+
  probe_disable_clk:
        clk_disable(host->clk);
 
  probe_free_clk:
        clk_put(host->clk);
 
- probe_free_irq_cd:
-       free_irq(host->irq_cd, host);
- 
  probe_free_dma:
        s3c2410_dma_free(host->dma, &s3cmci_dma_client);
 
@@ -1325,10 +1325,10 @@ static int s3cmci_remove(struct platform_device *pdev)
        struct s3cmci_host      *host = mmc_priv(mmc);
 
        mmc_remove_host(mmc);
+       free_irq(host->irq_cd, host);
        clk_disable(host->clk);
        clk_put(host->clk);
        s3c2410_dma_free(host->dma, &s3cmci_dma_client);
-       free_irq(host->irq_cd, host);
        free_irq(host->irq, host);
        iounmap(host->base);
        release_mem_region(host->mem->start, RESSIZE(host->mem));
-- 
1.6.0.rc2.3.gc264b