mmc: sdhci-iproc: handle mmc_of_parse() errors during probe

commit 2bd44dadd5bfb4135162322fd0b45a174d4ad5bf upstream.

We need to handle mmc_of_parse() errors during probe.

This finally fixes the wifi regression on Raspberry Pi 3 series.
In error case the wifi chip was permanently in reset because of
the power sequence depending on the deferred probe of the GPIO expander.

Fixes: b580c52d ("mmc: sdhci-iproc: add IPROC SDHCI driver")
Cc: stable@vger.kernel.org
Signed-off-by: NStefan Wahren <stefan.wahren@i2se.com>
Acked-by: NAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/mmc/host/sdhci-iproc.c

@@ -279,7 +279,10 @@ static int sdhci_iproc_probe(struct platform_device *pdev)
 
 	iproc_host->data = iproc_data;
 
-	mmc_of_parse(host->mmc);
+	ret = mmc_of_parse(host->mmc);
+	if (ret)
+		goto err;
+
 	sdhci_get_of_property(pdev);
 
 	host->mmc->caps |= iproc_host->data->mmc_caps;