Reference counting of MMC host driver modules
From: Enrik Berkhan
Date: Fri Jan 09 2009 - 12:15:26 EST
Hi,
I've noticed recently that the MMC/SD block driver does not reference
count the MMC/SD host driver module that it uses via the MMC/SD core
layer. Thus, I can rmmod my host driver module while, for example, a
partition on a SD card is mounted.
Assuming this does not happen intentionally, what would be the correct
fix? Is a try_module_get(card->host->parent->driver->owner) in
mmc_blk_alloc() in drivers/mmc/card/block.c the right thing to do? If
so, I could provide a patch fixing the issue. If not, please give me
advice how to do it better :) (May be I'm missing something that has to
do with hotplugging, as the devices I'm using are non-removeable).
Or am I possibly doing something wrong in my host driver and this
problem is not present for others at all?
Enrik
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