[PATCH 20/42] mmc: exynos_dw_mmc: Fix getting private data in exynos_dwmci_board_init()

[Sam Protsenko]

In case of CONFIG_DM_MMC, host->priv actually holds (struct udevice *),
and not (struct dwmci_exynos_priv_data *). This makes *priv pointer
invalid and may lead to Synchronous Abort during its dereference later
in exynos_dwmci_board_init(). Fix it by extracting
exynos_dwmmc_get_priv() helper from exynos_dwmci_clksel() and using it
for getting the private data in exynos_dwmci_board_init()

Fixes: 3537ee879e04 ("mmc: exynos_dw_mmc: support the Driver mode for Exynos")
Signed-off-by: Sam Protsenko <semen.protse...@linaro.org>
---
 drivers/mmc/exynos_dw_mmc.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/mmc/exynos_dw_mmc.c b/drivers/mmc/exynos_dw_mmc.c
index 1f69e193f601..8e80bd6a059f 100644
--- a/drivers/mmc/exynos_dw_mmc.c
+++ b/drivers/mmc/exynos_dw_mmc.c
@@ -42,18 +42,24 @@ struct dwmci_exynos_priv_data {
        u32 sdr_timing;
 };
 
+static struct dwmci_exynos_priv_data *exynos_dwmmc_get_priv(
+               struct dwmci_host *host)
+{
+#ifdef CONFIG_DM_MMC
+       return container_of(host, struct dwmci_exynos_priv_data, host);
+#else
+       return host->priv;
+#endif
+}
+
 /*
  * Function used as callback function to initialise the
  * CLKSEL register for every mmc channel.
  */
 static int exynos_dwmci_clksel(struct dwmci_host *host)
 {
-#ifdef CONFIG_DM_MMC
-       struct dwmci_exynos_priv_data *priv =
-               container_of(host, struct dwmci_exynos_priv_data, host);
-#else
-       struct dwmci_exynos_priv_data *priv = host->priv;
-#endif
+       struct dwmci_exynos_priv_data *priv = exynos_dwmmc_get_priv(host);
+
        dwmci_writel(host, DWMCI_CLKSEL, priv->sdr_timing);
 
        return 0;
@@ -83,7 +89,7 @@ unsigned int exynos_dwmci_get_clk(struct dwmci_host *host, 
uint freq)
 
 static void exynos_dwmci_board_init(struct dwmci_host *host)
 {
-       struct dwmci_exynos_priv_data *priv = host->priv;
+       struct dwmci_exynos_priv_data *priv = exynos_dwmmc_get_priv(host);
 
        if (host->quirks & DWMCI_QUIRK_DISABLE_SMU) {
                dwmci_writel(host, EMMCP_MPSBEGIN0, 0);
-- 
2.39.2