mmc: core: Export mmc_get_ext_csd()

Callers of mmc_send_ext_csd() will be able to decrease code duplication
by using mmc_get_ext_csd() instead. Let's make it available.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index 1db60be43c37..72e1f9b3ed0d 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -385,6 +385,35 @@ int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
 }
 EXPORT_SYMBOL_GPL(mmc_send_ext_csd);
 
+int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
+{
+        int err;
+        u8 *ext_csd;
+
+        if (!card || !new_ext_csd)
+                return -EINVAL;
+
+        if (!mmc_can_ext_csd(card))
+                return -EOPNOTSUPP;
+
+        /*
+         * As the ext_csd is so large and mostly unused, we don't store the
+         * raw block in mmc_card.
+         */
+        ext_csd = kmalloc(512, GFP_KERNEL);
+        if (!ext_csd)
+                return -ENOMEM;
+
+        err = mmc_send_ext_csd(card, ext_csd);
+        if (err)
+                kfree(ext_csd);
+        else
+                *new_ext_csd = ext_csd;
+
+        return err;
+}
+EXPORT_SYMBOL_GPL(mmc_get_ext_csd);
+
 int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
 {
         struct mmc_command cmd = {0};