linux-kernel - [PATCH 4.19 37/50] dma-buf: Discard old fence_excl on retrying get_fences

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Message-Id: <20190726152304.472814201@linuxfoundation.org>
Date:   Fri, 26 Jul 2019 17:25:12 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chris Wilson <chris@...is-wilson.co.uk>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Christian König <christian.koenig@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sumit Semwal <sumit.semwal@...aro.org>
Subject: [PATCH 4.19 37/50] dma-buf: Discard old fence_excl on retrying get_fences_rcu for realloc

From: Chris Wilson <chris@...is-wilson.co.uk>

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@...is-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc: Christian König <christian.koenig@....com>
Cc: Alex Deucher <alexander.deucher@....com>
Cc: Sumit Semwal <sumit.semwal@...aro.org>
Cc: stable@...r.kernel.org #v4.10
Reviewed-by: Christian König <christian.koenig@....com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190604125323.21396-1-chris@chris-wilson.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/dma-buf/reservation.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/dma-buf/reservation.c
+++ b/drivers/dma-buf/reservation.c
@@ -416,6 +416,10 @@ int reservation_object_get_fences_rcu(st
 					   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;