mmc: improve error code feedback

Now that we use "normal" error codes, improve the reporting and response
to error codes in the core.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 19 insertions, 8 deletions

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index fe483d5af74..258fe73eeaa 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -176,14 +176,20 @@ static int mmc_read_ext_csd(struct mmc_card *card)
         ext_csd = kmalloc(512, GFP_KERNEL);
         if (!ext_csd) {
                 printk(KERN_ERR "%s: could not allocate a buffer to "
-                        "receive the ext_csd. mmc v4 cards will be "
-                        "treated as v3.\n", mmc_hostname(card->host));
+                        "receive the ext_csd.\n", mmc_hostname(card->host));
                 return -ENOMEM;
         }
 
         err = mmc_send_ext_csd(card, ext_csd);
         if (err) {
                 /*
+                 * We all hosts that cannot perform the command
+                 * to fail more gracefully
+                 */
+                if (err != -EINVAL)
+                        goto out;
+
+                /*
                  * High capacity cards should have this "magic" size
                  * stored in their CSD.
                  */
@@ -199,6 +205,7 @@ static int mmc_read_ext_csd(struct mmc_card *card)
                                 mmc_hostname(card->host));
                         err = 0;
                 }
+
                 goto out;
         }
 
@@ -269,8 +276,10 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
                 goto err;
 
         if (oldcard) {
-                if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
+                if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
+                        err = -ENOENT;
                         goto err;
+                }
 
                 card = oldcard;
         } else {
@@ -278,8 +287,10 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
                  * Allocate card structure.
                  */
                 card = mmc_alloc_card(host);
-                if (IS_ERR(card))
+                if (IS_ERR(card)) {
+                        err = PTR_ERR(card);
                         goto err;
+                }
 
                 card->type = MMC_TYPE_MMC;
                 card->rca = 1;
@@ -304,10 +315,10 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
                         goto free_card;
 
                 err = mmc_decode_csd(card);
-                if (err < 0)
+                if (err)
                         goto free_card;
                 err = mmc_decode_cid(card);
-                if (err < 0)
+                if (err)
                         goto free_card;
         }
 
@@ -379,7 +390,7 @@ free_card:
                 mmc_remove_card(card);
 err:
 
-        return -EIO;
+        return err;
 }
 
 /*
@@ -587,6 +598,6 @@ err:
         printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
                 mmc_hostname(host), err);
 
-        return 0;
+        return err;
 }