MIPS: SB1250: Validate and update IRQ affinity

sb1250_set_affinity() selects the first online CPU in the requested
affinity mask without checking whether such a CPU exists. If the
intersection is empty, the resulting CPU index is invalid and must
not be passed to cpu_logical_map().

Reject affinity masks containing no online CPU with -EINVAL before
accessing the CPU mapping or interrupt mapper registers.

Also update the effective affinity mask to reflect the single logical
CPU selected as the interrupt target.

Fixes: 421d1563c662 ("mips: Validate online cpus in irq_set_affinity() callbacks")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

0 files changed, 0 insertions, 0 deletions