linux-kernel - [PATCH 13/22] drm/amdgpu: Use vma_lookup() in amdgpu_ttm_tt_get_user

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Message-ID: <20210510165839.2692974-14-Liam.Howlett@Oracle.com>
Date:   Mon, 10 May 2021 16:58:54 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Rik van Riel <riel@...riel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Michel Lespinasse <michel@...pinasse.org>,
        Liam Howlett <liam.howlett@...cle.com>
Subject: [PATCH 13/22] drm/amdgpu: Use vma_lookup() in
 amdgpu_ttm_tt_get_user_pages()

Use vma_lookup() to find the VMA at a specific address.  As vma_lookup()
will return NULL if the address is not within any VMA, the start address
no longer needs to be validated.

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 3251f6b67e23..00b7fa8b953b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -694,9 +694,9 @@ int amdgpu_ttm_tt_get_user_pages(struct amdgpu_bo *bo, struct page **pages)
 		return -ESRCH;
 
 	mmap_read_lock(mm);
-	vma = find_vma(mm, start);
+	vma = vma_lookup(mm, start);
 	mmap_read_unlock(mm);
-	if (unlikely(!vma || start < vma->vm_start)) {
+	if (unlikely(!vma)) {
 		r = -EFAULT;
 		goto out_putmm;
 	}
-- 
2.30.2