From mboxrd@z Thu Jan 1 00:00:00 1970 From: robin.murphy@arm.com (Robin Murphy) Date: Tue, 13 Sep 2016 14:26:38 +0100 Subject: [PATCH] iommu/io-pgtable-arm: Check for v7s-incapable systems Message-ID: <2e473e263ac469bd6d3b09e7756c138325e10969.1473773198.git.robin.murphy@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On machines with no 32-bit addressable RAM whatsoever, we shouldn't even touch the v7s format as it's never going to work. Fixes: e5fc9753b1a8 ("iommu/io-pgtable: Add ARMv7 short descriptor support") Reported-by: Eric Auger Signed-off-by: Robin Murphy --- drivers/iommu/io-pgtable-arm-v7s.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/iommu/io-pgtable-arm-v7s.c b/drivers/iommu/io-pgtable-arm-v7s.c index def8ca1c982d..b7759a48f4ed 100644 --- a/drivers/iommu/io-pgtable-arm-v7s.c +++ b/drivers/iommu/io-pgtable-arm-v7s.c @@ -633,6 +633,9 @@ static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg, { struct arm_v7s_io_pgtable *data; + if (upper_32_bits(PHYS_OFFSET)) + return NULL; + if (cfg->ias > ARM_V7S_ADDR_BITS || cfg->oas > ARM_V7S_ADDR_BITS) return NULL; -- 2.8.1.dirty