X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=drivers%2Fmmc%2Fcore%2Fmmc.c;h=1eda8dd8c867228b5643e40f7655b513643eb26f;hb=68e370289c29e3beac99d59c6d840d470af9dfcf;hp=793c6f7ddb049a735916eae87585b5cfb0f3b452;hpb=d1345c524e12c0cd1a81d5899d647f93e9fcb760;p=firefly-linux-kernel-4.4.55.git

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 793c6f7ddb04..1eda8dd8c867 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -324,13 +324,12 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
 		}
 	}
 
+	/*
+	 * The EXT_CSD format is meant to be forward compatible. As long
+	 * as CSD_STRUCTURE does not change, all values for EXT_CSD_REV
+	 * are authorized, see JEDEC JESD84-B50 section B.8.
+	 */
 	card->ext_csd.rev = ext_csd[EXT_CSD_REV];
-	if (card->ext_csd.rev > 7) {
-		pr_err("%s: unrecognised EXT_CSD revision %d\n",
-			mmc_hostname(card->host), card->ext_csd.rev);
-		err = -EINVAL;
-		goto out;
-	}
 
 	card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
 	card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];