msm: kgsl: Protect the memdesc->gpuaddr in SVM use cases
When SVM is being used there can only be one GPU address assigned
to the memory descriptor. Don't allow the GPU address to be changed
after it has been negotiated the first time by a process.
Change-Id: Ic0dedbad2a1b3ccdc2c1598a6c501b2be288d64e
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Harshitha Sai Neelati <hsaine@codeaurora.org>
Signed-off-by: Pranav Patel <pranavp@codeaurora.org>
Issue: FP3SEC-127
(cherry picked from commit 286b115bad6c40288f69fb765f63013dde9e4a93)
diff --git a/drivers/gpu/msm/kgsl_iommu.c b/drivers/gpu/msm/kgsl_iommu.c
index 0bb24d6..82536f4 100644
--- a/drivers/gpu/msm/kgsl_iommu.c
+++ b/drivers/gpu/msm/kgsl_iommu.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2011-2019, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2011-2021, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@@ -2523,6 +2523,11 @@
goto out;
}
+ /*
+ * This path is only called in a non-SVM path with locks so we can be
+ * sure we aren't racing with anybody so we don't need to worry about
+ * taking the lock
+ */
ret = _insert_gpuaddr(pagetable, addr, size);
if (ret == 0) {
memdesc->gpuaddr = addr;