Commit-ID: 3ad2a5f57656a14d964b673a5a0e4ab0e583c870
Gitweb: http://git.kernel.org/tip/3ad2a5f57656a14d964b673a5a0e4ab0e583c870
Author: Minghuan Lian <Minghuan.Lian@xxxxxxxxxxxxx>
AuthorDate: Wed, 20 May 2015 10:13:15 -0500
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Wed, 20 May 2015 22:13:37 +0200
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@xxxxxxxxxxxxx>
[ stuart: Added comments and massaged changelog ]
Signed-off-by: Stuart Yoder <stuart.yoder@xxxxxxxxxxxxx>
Reviewed-by: Marc Zygnier <marc.zyngier@xxxxxxx>
Cc: <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: <jason@xxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1432134795-661-1-git-send-email-stuart.yoder@xxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
drivers/irqchip/irq-gic-v3-its.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 9687f8a..1b7e155 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",
--
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