]> git.baikalelectronics.ru Git - kernel.git/commit
mmc: block: Allow more than 8 partitions per card
authorColin Cross <ccross@android.com>
Thu, 22 Oct 2015 17:00:41 +0000 (10:00 -0700)
committerUlf Hansson <ulf.hansson@linaro.org>
Mon, 28 Dec 2015 11:51:38 +0000 (12:51 +0100)
commit8e79560db6cbe9bca8e219ba78b6be4bc13c3ae8
tree4fd2ac9e1260d2c06ddaf8b4b9b91728991e8f50
parent3aba372f82ab68c96e47f5821e01abc9fb470cce
mmc: block: Allow more than 8 partitions per card

It is quite common for Android devices to utilize more
then 8 partitions on internal eMMC storage.

The vanilla kernel can support this via
CONFIG_MMC_BLOCK_MINORS, however that solution caps the
system to 256 minors total, which limits the number of
mmc cards the system can support.

This patch, which has been carried for quite awhile in
the AOSP common tree, provides an alternative solution
that doesn't seem to limit the total card count. So I
wanted to submit it for consideration upstream.

This patch sets the GENHD_FL_EXT_DEVT flag, which will
allocate minor number in major 259 for partitions past
disk->minors.

It also removes the use of disk_devt to determine devidx
from md->disk. md->disk->first_minor is always initialized
from devidx and can always be used to recover it.

Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ben Hutchings <ben@decadent.org.uk>
Cc: Chuanxiao Dong <chuanxiao.dong@intel.com>
Cc: Shawn Lin <shawn.lin@rock-chips.com>
Cc: Austin S Hemmelgarn <ahferroin7@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Android Kernel Team <kernel-team@android.com>
Cc: linux-mmc@vger.kernel.org
Signed-off-by: Colin Cross <ccross@android.com>
[jstultz: Added context to commit message]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
drivers/mmc/card/block.c