Hello,
I have on an OMAPL138 board running 2.6.33-rc4 (I would liked to try a
more recent kernel but I do not have any boards which supports a more
recent version). I noticed that I was unable to detect from sysfs if
the inserted card was set to read only. The block device's
/sys/class/block/mmcblk0/ro entry always reported 0. The read only
gpio is correctly setup as opening the device for writing fails as
expected.
If I compare the behavior with a USB card reader (which of course
doesn't initialize the block device in the same way), the
/sys/class/block/xxx/ro entry is correct.
I am unsure if this is the desired behavior (if so I would really like
to understand why) but here's what I did to correct it.
Regards
Marc
--- a/drivers/mmc/card/block.c 2011-01-31 08:54:56.908952200 -0500
+++ b/drivers/mmc/card/block.c 2011-01-31 08:56:44.175950200 -0500
@@ -621,6 +621,7 @@
md->disk->private_data = md;
md->disk->queue = md->queue.queue;
md->disk->driverfs_dev = &card->dev;
+ set_disk_ro(md->disk, md->read_only);
/*
* As discussed on lkml, GENHD_FL_REMOVABLE should:
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