i.MX28: Check if WP detection is implemented at all

If the WP function is NULL, simply assume the card is always RW.

Signed-off-by: Marek Vasut <[email protected]>
Cc: Stefano Babic <[email protected]>
Cc: Wolfgang Denk <[email protected]>
Cc: Detlev Zundel <[email protected]>
Cc: Fabio Estevam <[email protected]>
Acked-by: Stefano Babic <[email protected]>

diff --git a/drivers/mmc/mxsmmc.c b/drivers/mmc/mxsmmc.c
index 35c6bdabb06d4b71e8cf46263aa22c2cbf0301ec..c7200ee71aeb2e0e622c5993bf5185f52658250a 100644 (file)
--- a/drivers/mmc/mxsmmc.c
+++ b/drivers/mmc/mxsmmc.c
@@ -133,7 +133,8 @@ mxsmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
                /* READ or WRITE */
                if (data->flags & MMC_DATA_READ) {
                        ctrl0 |= SSP_CTRL0_READ;
-               } else if (priv->mmc_is_wp(mmc->block_dev.dev)) {
+               } else if (priv->mmc_is_wp &&
+                       priv->mmc_is_wp(mmc->block_dev.dev)) {
                        printf("MMC%d: Can not write a locked card!\n",
                                mmc->block_dev.dev);
                        return UNUSABLE_ERR;