From: Kaustav Majumdar 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 Cc: Dominik Brodowski Signed-off-by: Andrew Morton --- drivers/pcmcia/pcmcia_resource.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -puN drivers/pcmcia/pcmcia_resource.c~pcmcia-update-alloc_io_space-for-conflict-checking-for-multifunction-pc-card-for-linux-kernel-26154 drivers/pcmcia/pcmcia_resource.c --- a/drivers/pcmcia/pcmcia_resource.c~pcmcia-update-alloc_io_space-for-conflict-checking-for-multifunction-pc-card-for-linux-kernel-26154 +++ a/drivers/pcmcia/pcmcia_resource.c @@ -95,7 +95,7 @@ static int alloc_io_space(struct pcmcia_ * 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++) { _