imxmmc: fix crash when no platform data is provided

Don't crash if no platform data is provided.
In this case assume that card is present.

Signed-off-by: Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
Acked-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

diff --git a/drivers/mmc/host/imxmmc.c b/drivers/mmc/host/imxmmc.c
index 9cda12f..f61406d 100644 (file)
--- a/drivers/mmc/host/imxmmc.c
+++ b/drivers/mmc/host/imxmmc.c
@@ -905,7 +905,8 @@ static void imxmci_check_status(unsigned long data)
 {
        struct imxmci_host *host = (struct imxmci_host *)data;
 
-       if( host->pdata->card_present(mmc_dev(host->mmc)) != host->present ) {
+       if (host->pdata && host->pdata->card_present &&
+           host->pdata->card_present(mmc_dev(host->mmc)) != host->present) {
                host->present ^= 1;
                dev_info(mmc_dev(host->mmc), "card %s\n",
                      host->present ? "inserted" : "removed");
@@ -968,6 +969,8 @@ static int imxmci_probe(struct platform_device *pdev)
        host->mmc = mmc;
        host->dma_allocated = 0;
        host->pdata = pdev->dev.platform_data;
+       if (!host->pdata)
+               dev_warn(&pdev->dev, "No platform data provided!\n");
 
        spin_lock_init(&host->lock);
        host->res = r;
@@ -1020,7 +1023,11 @@ static int imxmci_probe(struct platform_device *pdev)
        if (ret)
                goto out;
 
-       host->present = host->pdata->card_present(mmc_dev(mmc));
+       if (host->pdata && host->pdata->card_present)
+               host->present = host->pdata->card_present(mmc_dev(mmc));
+       else    /* if there is no way to detect assume that card is present */
+               host->present = 1;
+
        init_timer(&host->timer);
        host->timer.data = (unsigned long)host;
        host->timer.function = imxmci_check_status;