From: Qiang Yu <yuq825@gmail.com>
Date: Sun, 22 Sep 2019 07:49:00 +0000 (+0800)
Subject: dma-buf/resv: fix exclusive fence get
X-Git-Tag: v5.4-rc4~23^2^2~6
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c3d79a83ca10d2026fd1cce096cde2d8e316592e;p=thirdparty%2Fkernel%2Flinux.git

dma-buf/resv: fix exclusive fence get

This causes kernel crash when testing lima driver.

Cc: Christian König <christian.koenig@amd.com>
Fixes: b8c036dfc66f ("dma-buf: simplify reservation_object_get_fences_rcu a bit")
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190922074900.853-1-yuq825@gmail.com
Signed-off-by: Christian König <christian.koenig@amd.com>
---

diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
index 42a8f3f116813..709002515550c 100644
--- a/drivers/dma-buf/dma-resv.c
+++ b/drivers/dma-buf/dma-resv.c
@@ -471,7 +471,7 @@ unlock:
 	if (pfence_excl)
 		*pfence_excl = fence_excl;
 	else if (fence_excl)
-		shared[++shared_count] = fence_excl;
+		shared[shared_count++] = fence_excl;
 
 	if (!shared_count) {
 		kfree(shared);