linux-kernel - [PATCH 5/7] mmc-utils: remove write

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Date:   Tue,  9 Oct 2018 13:31:09 -0400
From:   James Nuss <jamesnuss@...ometrics.ca>
To:     linux-mmc@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH 5/7] mmc-utils: remove write_reliability set command

The "write_reliability set" command is dangerous since it will only set
write-reliability on one partition per command and this command is a
one-time programmable action. This makes it impossible to set
write-reliability on multiple partitions.

Remove the command so it cannot be used in the future.
Use "write_reliability set_register" instead.

Signed-off-by: James Nuss <jamesnuss@...ometrics.ca>
---
 mmc.c      |  5 -----
 mmc_cmds.c | 67 --------------------------------------------------------------
 mmc_cmds.h |  1 -
 3 files changed, 73 deletions(-)

diff --git a/mmc.c b/mmc.c
index aaefd3d..655546b 100644
--- a/mmc.c
+++ b/mmc.c
@@ -97,11 +97,6 @@ static struct Command commands[] = {
 		"Enable the enhanced user area for the <device>.\nDry-run only unless -y or -c is passed.\nUse -c if more partitioning settings are still to come.\nNOTE!  This is a one-time programmable (unreversible) change.",
 	  NULL
 	},
-	{ do_write_reliability_set, -2,
-	  "write_reliability set", "<-y|-n|-c> " "<partition> " "<device>\n"
-		"Enable write reliability per partition for the <device>.\nDry-run only unless -y or -c is passed.\nUse -c if more partitioning settings are still to come.\nNOTE!  This is a one-time programmable (unreversible) change.",
-	  NULL
-	},
 	{ do_write_reliability_set_register, -2,
 	  "write_reliability set_register", "<partition-mask> " "<device>\n"
 		"Set the write-reliability register (WR_REL_SET) for the <device>.\n"
diff --git a/mmc_cmds.c b/mmc_cmds.c
index 68c73ef..9565bc9 100644
--- a/mmc_cmds.c
+++ b/mmc_cmds.c
@@ -1303,73 +1303,6 @@ int do_write_reliability_set_register(int nargs, char **argv)
 	return 0;
 }
 
-int do_write_reliability_set(int nargs, char **argv)
-{
-	__u8 value;
-	__u8 ext_csd[512];
-	int fd, ret;
-
-	int dry_run = 1;
-	int partition;
-	char *device;
-
-	if (nargs != 4) {
-		fprintf(stderr,"Usage: mmc write_reliability set <-y|-n|-c> <partition> </path/to/mmcblkX>\n");
-		exit(1);
-	}
-
-	if (!strcmp("-y", argv[1])) {
-		dry_run = 0;
-	} else if (!strcmp("-c", argv[1])) {
-		dry_run = 2;
-	}
-
-	partition = strtol(argv[2], NULL, 10);
-	device = argv[3];
-
-	fd = open(device, O_RDWR);
-	if (fd < 0) {
-		perror("open");
-		exit(1);
-	}
-
-	ret = read_extcsd(fd, ext_csd);
-	if (ret) {
-		fprintf(stderr, "Could not read EXT_CSD from %s\n", device);
-		exit(1);
-	}
-
-	/* assert not PARTITION_SETTING_COMPLETED */
-	if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED])
-	{
-		printf(" Device is already partitioned\n");
-		exit(1);
-	}
-
-	/* assert HS_CTRL_REL */
-	if (!(ext_csd[EXT_CSD_WR_REL_PARAM] & HS_CTRL_REL)) {
-		printf("Cannot set write reliability parameters, WR_REL_SET is "
-				"read-only\n");
-		exit(1);
-	}
-
-	value = ext_csd[EXT_CSD_WR_REL_SET] | (1<<partition);
-	ret = write_extcsd_value(fd, EXT_CSD_WR_REL_SET, value);
-	if (ret) {
-		fprintf(stderr, "Could not write 0x%02x to EXT_CSD[%d] in %s\n",
-				value, EXT_CSD_WR_REL_SET, device);
-		exit(1);
-	}
-
-	printf("Done setting EXT_CSD_WR_REL_SET to 0x%02x on %s\n",
-		value, device);
-
-	if (set_partitioning_setting_completed(dry_run, device, fd))
-		exit(1);
-
-	return 0;
-}
-
 int do_read_extcsd(int nargs, char **argv)
 {
 	__u8 ext_csd[512], ext_csd_rev, reg;
diff --git a/mmc_cmds.h b/mmc_cmds.h
index 8ca9ac9..cf6c6fb 100644
--- a/mmc_cmds.h
+++ b/mmc_cmds.h
@@ -34,7 +34,6 @@ int do_sanitize(int nargs, char **argv);
 int do_status_get(int nargs, char **argv);
 int do_create_gp_partition(int nargs, char **argv);
 int do_enh_area_set(int nargs, char **argv);
-int do_write_reliability_set(int nargs, char **argv);
 int do_write_reliability_set_register(int nargs, char **argv);
 int do_rpmb_write_key(int nargs, char **argv);
 int do_rpmb_read_counter(int nargs, char **argv);
-- 
2.7.4


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