[PATCH] pcmcia: fix i82365 request_region double usage

http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=f354942cb301fed273f423fb5c4f57bde3efc5b2
converted the check_region() calls in drivers/pcmcia/i82365.c into
request_regions.  Unfortunately this seems to have broken things.

isa_probe() used to call check_region() and then call add_pcic() which would
request_region().

Now isa_probe() calls request_region() and then calls add_pcic() which calls
request_region() again, this fails and add_pcic() returns immediately without
doing all the setup etc.

On the face of it the patch below fixes the problem, by not doing the second
request region in add_pcic().  I think this is preferable to remove the call
in isa_probe() since identify() touches the I/O regions and is called before
add_pcic().

However I haven't fully grokked the meaning of the code which follows the
request_region() in isa_probe(), so I'm not sure that the handling WRT
multiple sockets and multiple bridge chips is correct.  In particular I'm not
convinced that the regions for subsequent sockets and/or bridges will be
requested at all.  I suspect a more thorough reworking by someone who
understands what is going on there might be in order.

I should mention that I'm actually messing about with this on an ARM platform
with wacky memory and i/o mapping offsets etc, it doesn't quite work yet for
other reasons which preclude full testing etc, but I think the problem above
is still present for more normal x86 stuff.

Signed-off-by: Ian Campbell <icampbell@arcom.com>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/pcmcia/i82365.c b/drivers/pcmcia/i82365.c
index d72f9a3..3546158 100644 (file)
--- a/drivers/pcmcia/i82365.c
+++ b/drivers/pcmcia/i82365.c
@@ -698,14 +698,6 @@ static void __init add_pcic(int ns, int type)
     struct i82365_socket *t = &socket[sockets-ns];
 
     base = sockets-ns;
-    if (t->ioaddr > 0) {
-       if (!request_region(t->ioaddr, 2, "i82365")) {
-           printk(KERN_ERR "i82365: IO region conflict at %#lx, not available\n",
-                       t->ioaddr);
-           return;
-       }
-    }
-    
     if (base == 0) printk("\n");
     printk(KERN_INFO "  %s", pcic[type].name);
     printk(" ISA-to-PCMCIA at port %#lx ofs 0x%02x",