ieee1394: raw1394: prevent unloading of low-level driver

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Unloading the low-level driver module of a FireWire host can lead to
all sorts of trouble if a raw1394 userspace client is using the host.
Just disallow it by incrementing the LLD's module reference count on
a RAW1394_REQ_SET_CARD write operation.  Decrement it when the file
is closed.

This feature wouldn't be relevant if "modprobe -r video1394" or
"modprobe -r dv1394" didn't automatically unload ohci1394 too.
http://bugzilla.kernel.org/show_bug.cgi?id=7701

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Dan Dennedy <dan@dennedy.org>

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This commit is contained in:

Stefan Richter 2007-02-03 16:48:51 +01:00

parent 12ba145c94

commit 0fe4c6fcac

1 changed files with 29 additions and 19 deletions

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drivers/ieee1394/raw1394.c

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