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: v5.5-rc1~128^2~31^2~70
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=7fbd0782bf94d46993a7e5c08c0feda8dcab1f76;p=linux.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
---

diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
index 42a8f3f11681..709002515550 100644
--- a/drivers/dma-buf/dma-resv.c
+++ b/drivers/dma-buf/dma-resv.c
@@ -471,7 +471,7 @@ int dma_resv_get_fences_rcu(struct dma_resv *obj,
 	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);