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Hi!
Below I've included a small patch to the floppy driver that makes it
check for IO regions before doing any hardware probing. There could be
conflicts between the floppy driver and the ftape driver when
accidentally trying to access a floppy disk while the ftape driver was
using the tape drive (or vice versa). My latest development version of
the ftape driver also uses the check_region() calls before accessing
hardware registers s.t. those conflicts should be solved.
What I've done: call check_region() before actually accessing the
hardware. If the region is unused, call request_region() to signal
other drivers (i.e. ftape) that the io region is currently in use.
The current version of the floppy driver does part of its hardware
probing before checking if other drivers (i.e. ftape) make currently
use of it.
The patched floppy driver also releases the regions after releasing the
irq and dma channel. The current implementation doesn't do this but
leave the io region `allocated' until it is unloaded (i.e. never when
compiled into the kernel). This behavior make the proper use of
check/request/release_region() impossible with the floppy driver.
Hopefully the patch doesn't hose up the floppy driver. It works for
me, though. That patch is against 2.1.30. It should also apply to
2.0.29, but I only tested it with 2.1.30.
Cheers
Claus
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Content-Type: text/plain; charset=US-ASCII
Claus-Justus Heine
claus@momo.math.rwth-aachen.de
http://samuel.math.rwth-aachen.de/~LBFM/claus
PGP Public Key:
http://samuel.math.rwth-aachen.de/~LBFM/claus/claus-public-key.asc
Ftape - the Linux Floppy Tape Project
WWW : http://samuel.math.rwth-aachen.de/~LBFM/claus/ftape
Mailing-list: linux-tape@vger.rutgers.edu
Newsgroup : linux.dev.tape
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