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SubjectRE: mmc/card/block.c : mmc_blk_open readonly mount bug?
Guess nobody tests with readonly?  We had a socket on our board that
flipped the write protect signal, and the rest you know :-)

-----Original Message-----
From: Pierre Ossman []
Sent: Friday, September 05, 2008 1:07 PM
To: Andrew Morton
Cc: Sasi Nair;
Subject: Re: mmc/card/block.c : mmc_blk_open readonly mount bug?

On Thu, 4 Sep 2008 16:08:08 -0700
Andrew Morton <> wrote:

> From: Andrew Morton <>
> mmc_block_open() increments md->usage although it returns with -EROFS
> default mounting a MMC/SD card with write protect switch on. This
> reference counting bug prevents /dev/mmcblkX from being released on
> removal, and situation worsen with reinsertion until the minor number
> range runs out.
> Reported-by: <>
> Cc: Pierre Ossman <>
> Cc: <> [2.6.25.x, 2.6.26.x]
> Signed-off-by: Andrew Morton <>
> ---

I wonder how that bug has been able to go unnoticed for so long...

Acked-by: Pierre Ossman <>

-- Pierre Ossman

Linux kernel, MMC maintainer
rdesktop, core developer

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