[PATCH v2] irqchip/gicv3-its: ITS table size should not be smaller than PSZ

[Minghuan Lian]

The default page size of ITS table has been changed to 64KB,
but for some platforms the real size of allocated memory which
calculated by DEVBITS of register GITS_TYPER may be smaller than
default size. In this case, the allocation size must be increased
to the default size, otherwise, the wrong page number will cause
kernel hang.

Signed-off-by: Minghuan Lian <Minghuan.Lian@xxxxxxxxxxxxx>
---
v2-v1:
Increase allocation size instead of decreasing PSZ

 drivers/irqchip/irq-gic-v3-its.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 9687f8a..19ab86d 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -828,7 +828,8 @@ static int its_alloc_tables(struct its_node *its)
 			u64 typer = readq_relaxed(its->base + GITS_TYPER);
 			u32 ids = GITS_TYPER_DEVBITS(typer);
 
-			order = get_order((1UL << ids) * entry_size);
+			order = max(get_order((1UL << ids) * entry_size),
+				    order);
 			if (order >= MAX_ORDER) {
 				order = MAX_ORDER - 1;
 				pr_warn("%s: Device Table too large, reduce its page order to %u\n",
-- 
1.9.1

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