* Regression: ABI: /sys/module/mmcblk changed to /sys/module/mmc_block
@ 2016-02-11 7:29 John Stultz
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From: John Stultz @ 2016-02-11 7:29 UTC (permalink / raw)
To: Ulf Hansson, Andy Shevchenko; +Cc: lkml, Greg KH
I recently noticed with 4.4 based kernel's Android's userspace wasn't
able to properly detect micro-SD cards when they were inserted.
This is due to vold not being able to access
/sys/module/mmcblk/parameters/perdev_minors
See: http://androidxref.com/6.0.1_r10/xref/system/vold/Disk.cpp#49
Looking into it, it seems commit 829b6962f7e3cfc ("mmc: block: don't
use parameter prefix if built as module") changed the behavior,
resulting in the userspace path changing to:
"/sys/module/mmc_block/..."
This seems like an ABI regression, which is breaking existing userspace.
So... Probably something to revert?
thanks
-john
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2016-02-11 7:29 Regression: ABI: /sys/module/mmcblk changed to /sys/module/mmc_block John Stultz
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