irqchip/gicv3-its: ITS table size should not be smaller than PSZ

When allocating a device table, if the requested allocation is smaller
than the default granule size of the ITS then, we need to round up to
the default size.

Signed-off-by: Minghuan Lian <Minghuan.Lian@freescale.com>
[ stuart: Added comments and massaged changelog ]
Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
Reviewed-by: Marc Zygnier <marc.zyngier@arm.com>
Cc: <linux-arm-kernel@lists.infradead.org>
Cc: <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/1432134795-661-1-git-send-email-stuart.yoder@freescale.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 9687f8afebff..1b7e155869f6 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -828,7 +828,14 @@ 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' was initialized earlier to the default page
+                         * granule of the the ITS.  We can't have an allocation
+                         * smaller than that.  If the requested allocation
+                         * is smaller, round up to the default page granule.
+                         */
+                        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",