mmc: core: Let's callers of from mmc_get_ext_csd() do error handling

The callers of mmc_get_ext_csd() need the flexibility to handle errors
themselves, because they behave differently.

Let's clean up mmc_get_ext_csd() with its friends and adopt the error
handling as stated above.

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

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 13f8e36..fe801e6 100644 (file)
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -188,10 +188,8 @@ static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
        BUG_ON(!card);
        BUG_ON(!new_ext_csd);
 
-       *new_ext_csd = NULL;
-
        if (!mmc_can_ext_csd(card))
-               return 0;
+               return -EOPNOTSUPP;
 
        /*
         * As the ext_csd is so large and mostly unused, we don't store the
@@ -202,32 +200,9 @@ static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
                return -ENOMEM;
 
        err = mmc_send_ext_csd(card, ext_csd);
-       if (err) {
+       if (err)
                kfree(ext_csd);
-               *new_ext_csd = NULL;
-
-               /* If the host or the card can't do the switch,
-                * fail more gracefully. */
-               if ((err != -EINVAL)
-                && (err != -ENOSYS)
-                && (err != -EFAULT))
-                       return err;
-
-               /*
-                * High capacity cards should have this "magic" size
-                * stored in their CSD.
-                */
-               if (card->csd.capacity == (4096 * 512)) {
-                       pr_err("%s: unable to read EXT_CSD "
-                               "on a possible high capacity card. "
-                               "Card will be ignored.\n",
-                               mmc_hostname(card->host));
-               } else {
-                       pr_warn("%s: unable to read EXT_CSD, performance might suffer\n",
-                               mmc_hostname(card->host));
-                       err = 0;
-               }
-       } else
+       else
                *new_ext_csd = ext_csd;
 
        return err;
@@ -395,9 +370,6 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
 
        BUG_ON(!card);
 
-       if (!ext_csd)
-               return 0;
-
        /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
        card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
        if (card->csd.structure == 3) {
@@ -639,12 +611,36 @@ out:
 
 static int mmc_read_ext_csd(struct mmc_card *card)
 {
-       u8 *ext_csd = NULL;
+       u8 *ext_csd;
        int err;
 
+       if (!mmc_can_ext_csd(card))
+               return 0;
+
        err = mmc_get_ext_csd(card, &ext_csd);
-       if (err)
+       if (err) {
+               /* If the host or the card can't do the switch,
+                * fail more gracefully. */
+               if ((err != -EINVAL)
+                && (err != -ENOSYS)
+                && (err != -EFAULT))
+                       return err;
+
+               /*
+                * High capacity cards should have this "magic" size
+                * stored in their CSD.
+                */
+               if (card->csd.capacity == (4096 * 512)) {
+                       pr_err("%s: unable to read EXT_CSD on a possible high capacity card. Card will be ignored.\n",
+                               mmc_hostname(card->host));
+               } else {
+                       pr_warn("%s: unable to read EXT_CSD, performance might suffer\n",
+                               mmc_hostname(card->host));
+                       err = 0;
+               }
+
                return err;
+       }
 
        err = mmc_decode_ext_csd(card, ext_csd);
        kfree(ext_csd);
@@ -660,11 +656,8 @@ static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
                return 0;
 
        err = mmc_get_ext_csd(card, &bw_ext_csd);
-
-       if (err || bw_ext_csd == NULL) {
-               err = -EINVAL;
-               goto out;
-       }
+       if (err)
+               return err;
 
        /* only compare read only fields */
        err = !((card->ext_csd.raw_partition_support ==
@@ -723,7 +716,6 @@ static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
        if (err)
                err = -EINVAL;
 
-out:
        kfree(bw_ext_csd);
        return err;
 }