From 1d27704a26313b9ed7463d4bfc6eda29e2bb3180 Mon Sep 17 00:00:00 2001 From: Yun Wu Date: Fri, 6 Mar 2015 16:37:48 +0000 Subject: irqchip: gicv3-its: Add limitation to page order When required size of Device Table is out of the page allocator's capability, the whole ITS will fail in probing. This actually is not the hardware's problem and is mainly a limitation of the kernel page allocator. This patch will keep ITS going on to the next initializaion stage with an explicit warning. Acked-by: Marc Zyngier Signed-off-by: Yun Wu Signed-off-by: Marc Zyngier Link: https://lkml.kernel.org/r/1425659870-11832-10-git-send-email-marc.zyngier@arm.com Signed-off-by: Jason Cooper --- drivers/irqchip/irq-gic-v3-its.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 0fe25a97a5a9..ec20d4a942e0 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -828,6 +828,11 @@ static int its_alloc_tables(struct its_node *its) u32 ids = GITS_TYPER_DEVBITS(typer); order = get_order((1UL << ids) * entry_size); + if (order >= MAX_ORDER) { + order = MAX_ORDER - 1; + pr_warn("%s: Device Table too large, reduce its page order to %u\n", + its->msi_chip.of_node->full_name, order); + } } alloc_size = (1 << order) * PAGE_SIZE; -- cgit v1.2.3