linux-kernel - [PATCH] mmc: check EXT_CSD_PARTITION_SETTING

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Date:	Thu, 17 Jul 2014 16:57:34 +0200
From:	Grégory Soutadé <gsoutade@...tion.com>
To:	Chris Ball <chris@...ntf.net>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mmc: check EXT_CSD_PARTITION_SETTING_COMPLETED before creating
 partitions

Create MMC general purpose partitions only if
EXT_CSD_PARTITION_SETTING_COMPLETED bit is set.
Some tools may set general purpose partition size(s) but fail or stop
without finalize.
Another case is to set invalid partition size(s).

Signed-off-by: Grégory Soutadé <gsoutade@...tion.com>
---
 drivers/mmc/core/mmc.c  |   15 +++++++++++----
 include/linux/mmc/mmc.h |    2 ++
 2 files changed, 13 insertions(+), 4 deletions(-)

>From commit b6603fe574af289dbe9eb9fb4c540bca04f5a053 in master linux tree.

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 793c6f7..b9fe211 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -471,10 +471,17 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
 				ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
 				part_size *= (size_t)(hc_erase_grp_sz *
 					hc_wp_grp_sz);
-				mmc_part_add(card, part_size << 19,
-					EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
-					"gp%d", idx, false,
-					MMC_BLK_DATA_AREA_GP);
+				if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED] &
+				EXT_CSD_PART_SETTING_COMPLETED) {
+					mmc_part_add(card, part_size << 19,
+						EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
+						"gp%d", idx, false,
+						MMC_BLK_DATA_AREA_GP);
+				} else {
+					pr_warn("%s: has partition size defined, but setting is not complete\n",
+						mmc_hostname(card->host));
+					break;
+				}
 			}
 		}
 		card->ext_csd.sec_trim_mult =
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 64ec963..78753bc 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -281,6 +281,7 @@ struct _mmc_csd {
 #define EXT_CSD_EXP_EVENTS_CTRL		56	/* R/W, 2 bytes */
 #define EXT_CSD_DATA_SECTOR_SIZE	61	/* R */
 #define EXT_CSD_GP_SIZE_MULT		143	/* R/W */
+#define EXT_CSD_PARTITION_SETTING_COMPLETED 155	/* R/W */
 #define EXT_CSD_PARTITION_ATTRIBUTE	156	/* R/W */
 #define EXT_CSD_PARTITION_SUPPORT	160	/* RO */
 #define EXT_CSD_HPI_MGMT		161	/* R/W */
@@ -349,6 +350,7 @@ struct _mmc_csd {
 #define EXT_CSD_PART_CONFIG_ACC_RPMB	(0x3)
 #define EXT_CSD_PART_CONFIG_ACC_GP0	(0x4)

+#define EXT_CSD_PART_SETTING_COMPLETED	(0x1)
 #define EXT_CSD_PART_SUPPORT_PART_EN	(0x1)

 #define EXT_CSD_CMD_SET_NORMAL		(1<<0)
-- 
1.7.0.4
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