[PATCH] pcmcia: update alloc_io_space for conflict checking for multifunction PC...

Some PCMCIA cards do not mention specific IO addresses in the CIS.  In that
case, inside the alloc_io_space function, conflicts are detected (the
function returns 1) for the second function of a multifunction card unless
the length of IO address range required is greater than 0x100.

The following patch will remove this conflict checking for a PCMCIA
function which had not mentioned any specific IO address to be mapped from.

The patch is tested for Linux kernel 2.6.15.4 and works fine in the above
case and is as suggested by Dave Hinds.

Signed-off-by: Kaustav Majumdar <kaustav.majumdar@wipro.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

diff --git a/drivers/pcmcia/pcmcia_resource.c b/drivers/pcmcia/pcmcia_resource.c
index 74cebd42403299e7d72d9e7fd0c628ca1f5b5389..b9201c2ec38b3d15523a09ac8ee3a3af35ddddcc 100644 (file)
--- a/drivers/pcmcia/pcmcia_resource.c
+++ b/drivers/pcmcia/pcmcia_resource.c
@@ -95,7 +95,7 @@ static int alloc_io_space(struct pcmcia_socket *s, u_int attr, ioaddr_t *base,
         * potential conflicts, just the most obvious ones.
         */
        for (i = 0; i < MAX_IO_WIN; i++)
-               if ((s->io[i].res) &&
+               if ((s->io[i].res) && *base &&
                    ((s->io[i].res->start & (align-1)) == *base))
                        return 1;
        for (i = 0; i < MAX_IO_WIN; i++) {