mmc: sdhci-esdhc-imx: do not reference platform data after probe

The patch copies platform data into pltfm_imx_data and reference
the data there than platform data after probe.

This work is inspired by Grant Likely and Troy Kisky.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Troy Kisky <troy.kisky@boundarydevices.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Wolfram Sang <w.sang@pengutronix.de>
Cc: Chris Ball <cjb@laptop.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Chris Ball <cjb@laptop.org>

1 files changed, 13 insertions, 9 deletions

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 4269bb498ff0..58fc6533d250 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -45,6 +45,7 @@
 struct pltfm_imx_data {
         int flags;
         u32 scratchpad;
+        struct esdhc_platform_data boarddata;
 };
 
 static inline void esdhc_clrset_le(struct sdhci_host *host, u32 mask, u32 val, int reg)
@@ -57,8 +58,9 @@ static inline void esdhc_clrset_le(struct sdhci_host *host, u32 mask, u32 val, i
 
 static u32 esdhc_readl_le(struct sdhci_host *host, int reg)
 {
-        struct esdhc_platform_data *boarddata =
-                        host->mmc->parent->platform_data;
+        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+        struct pltfm_imx_data *imx_data = pltfm_host->priv;
+        struct esdhc_platform_data *boarddata = &imx_data->boarddata;
 
         /* fake CARD_PRESENT flag */
         u32 val = readl(host->ioaddr + reg);
@@ -80,8 +82,7 @@ static void esdhc_writel_le(struct sdhci_host *host, u32 val, int reg)
 {
         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
         struct pltfm_imx_data *imx_data = pltfm_host->priv;
-        struct esdhc_platform_data *boarddata =
-                        host->mmc->parent->platform_data;
+        struct esdhc_platform_data *boarddata = &imx_data->boarddata;
 
         if (unlikely((reg == SDHCI_INT_ENABLE || reg == SDHCI_SIGNAL_ENABLE)
                         && (boarddata->cd_type == ESDHC_CD_GPIO)))
@@ -198,8 +199,9 @@ static unsigned int esdhc_pltfm_get_min_clock(struct sdhci_host *host)
 
 static unsigned int esdhc_pltfm_get_ro(struct sdhci_host *host)
 {
-        struct esdhc_platform_data *boarddata =
-                        host->mmc->parent->platform_data;
+        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+        struct pltfm_imx_data *imx_data = pltfm_host->priv;
+        struct esdhc_platform_data *boarddata = &imx_data->boarddata;
 
         switch (boarddata->wp_type) {
         case ESDHC_WP_GPIO:
@@ -281,12 +283,14 @@ static int __devinit sdhci_esdhc_imx_probe(struct platform_device *pdev)
         if (!(cpu_is_mx25() || cpu_is_mx35() || cpu_is_mx51()))
                 imx_data->flags |= ESDHC_FLAG_MULTIBLK_NO_INT;
 
-        boarddata = host->mmc->parent->platform_data;
-        if (!boarddata) {
+        if (!host->mmc->parent->platform_data) {
                 dev_err(mmc_dev(host->mmc), "no board data!\n");
                 err = -EINVAL;
                 goto no_board_data;
         }
+        imx_data->boarddata = *((struct esdhc_platform_data *)
+                                host->mmc->parent->platform_data);
+        boarddata = &imx_data->boarddata;
 
         /* write_protect */
         if (boarddata->wp_type == ESDHC_WP_GPIO) {
@@ -363,8 +367,8 @@ static int __devexit sdhci_esdhc_imx_remove(struct platform_device *pdev)
 {
         struct sdhci_host *host = platform_get_drvdata(pdev);
         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
-        struct esdhc_platform_data *boarddata = host->mmc->parent->platform_data;
         struct pltfm_imx_data *imx_data = pltfm_host->priv;
+        struct esdhc_platform_data *boarddata = &imx_data->boarddata;
         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
 
         sdhci_remove_host(host, dead);