From: Robin Murphy <robin.murphy@arm.com>
Date: Tue, 13 Sep 2016 17:02:02 +0000 (+0100)
Subject: iommu/io-pgtable-arm: Check for v7s-incapable systems
X-Git-Tag: Ubuntu-4.9.0-1.2~674^2^6^2
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=82db33dc5e49fb625262d81125625d07a0d6184e;p=mirror_ubuntu-zesty-kernel.git

iommu/io-pgtable-arm: Check for v7s-incapable systems

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 <eric.auger@redhat.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
---

diff --git a/drivers/iommu/io-pgtable-arm-v7s.c b/drivers/iommu/io-pgtable-arm-v7s.c
index def8ca1c982d..f50e51c1a9c8 100644
--- a/drivers/iommu/io-pgtable-arm-v7s.c
+++ b/drivers/iommu/io-pgtable-arm-v7s.c
@@ -633,6 +633,10 @@ static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg,
 {
 	struct arm_v7s_io_pgtable *data;
 
+#ifdef PHYS_OFFSET
+	if (upper_32_bits(PHYS_OFFSET))
+		return NULL;
+#endif
 	if (cfg->ias > ARM_V7S_ADDR_BITS || cfg->oas > ARM_V7S_ADDR_BITS)
 		return NULL;