From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Tue, 4 Jun 2019 12:53:23 +0000 (+0100)
Subject: dma-buf: Discard old fence_excl on retrying get_fences_rcu for realloc
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f7df48a76837c52e721f679dbcff64ef5b4576b9;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

dma-buf: Discard old fence_excl on retrying get_fences_rcu for realloc

commit f5b07b04e5f090a85d1e96938520f2b2b58e4a8e upstream.

If we have to drop the seqcount & rcu lock to perform a krealloc, we
have to restart the loop. In doing so, be careful not to lose track of
the already acquired exclusive fence.

Fixes: fedf54132d24 ("dma-buf: Restart reservation_object_get_fences_rcu() after writes")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: stable@vger.kernel.org #v4.10
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190604125323.21396-1-chris@chris-wilson.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/dma-buf/reservation.c b/drivers/dma-buf/reservation.c
index 012fa3d1f407..afc66141066d 100644
--- a/drivers/dma-buf/reservation.c
+++ b/drivers/dma-buf/reservation.c
@@ -394,6 +394,10 @@ int reservation_object_get_fences_rcu(struct reservation_object *obj,
 					   GFP_NOWAIT | __GFP_NOWARN);
 			if (!nshared) {
 				rcu_read_unlock();
+
+				dma_fence_put(fence_excl);
+				fence_excl = NULL;
+
 				nshared = krealloc(shared, sz, GFP_KERNEL);
 				if (nshared) {
 					shared = nshared;