mmc: card: not access RPMB partition for normal read and write

Commit Message

Michael Shigorin Feb. 26, 2015, 12:23 p.m. UTC

On Wed, Oct 01, 2014 at 05:53:30PM +0400, I wrote:
> what is the status of this patch to cope with MMC RPMB?
> http://permalink.gmane.org/gmane.linux.kernel.mmc/28281

Just in case, it's now also

Tested-by: Michael Shigorin <[e-mail]>

Hope to see this merged!

2 debian: please note that udev rules fixup is required, see also
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1333140
-- it's been fixed in 219 or see the patch in 218-10ubuntu1 package.

Patch

From: Martin Pitt <[e-mail]>
Date: Wed, 11 Feb 2015 15:26:52 +0100
Subject: rules: Fix by-path of mmc RPMB partitions and don't blkid them

Linux 3.10+ exposes RPMB (Replay Protected Memory Block) partitions of MMC
devices [1] ; trying to read them with blkid or other unspecific means will
cause kernel buffer I/O errors and timeouts.

Blacklist those to prevent creating wrong by-path links and
blkid'ing those.

[1] http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=090d25fe224c0

https://launchpad.net/bugs/1333140
---
 rules/60-persistent-storage.rules | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rules/60-persistent-storage.rules b/rules/60-persistent-storage.rules
index 475b151..25b44a5 100644
--- a/rules/60-persistent-storage.rules
+++ b/rules/60-persistent-storage.rules
@@ -14,7 +14,7 @@  ACTION=="add", SUBSYSTEM=="module", KERNEL=="block", ATTR{parameters/events_dfl_
 SUBSYSTEM!="block", GOTO="persistent_storage_end"
 
 # skip rules for inappropriate block devices
-KERNEL=="fd*|mtd*|nbd*|gnbd*|btibm*|dm-*|md*|zram*", GOTO="persistent_storage_end"
+KERNEL=="fd*|mtd*|nbd*|gnbd*|btibm*|dm-*|md*|zram*|mmcblk[0-9]*rpmb", GOTO="persistent_storage_end"
 
 # ignore partitions that span the entire disk
 TEST=="whole_disk", GOTO="persistent_storage_end"