43 lines
1.5 KiB
Diff
43 lines
1.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Dongwon Kim <dongwon.kim@intel.com>
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Date: Tue, 18 Jun 2019 00:55:32 -0700
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Subject: [PATCH] dma-buf/hyper_dmabuf: release double check exported
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remote sync-OPS_RELEASE checks 'exported' once more to prevent
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the case where it was removed already while waiting to acquire
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the mutex.
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Signed-off-by: Dongwon Kim <dongwon.kim@intel.com>
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---
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.../dma-buf/hyper_dmabuf/hyper_dmabuf_remote_sync.c | 12 +++++++-----
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1 file changed, 7 insertions(+), 5 deletions(-)
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diff --git a/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_remote_sync.c b/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_remote_sync.c
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index 03cdedf84e44..3ce8162fecfd 100644
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--- a/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_remote_sync.c
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+++ b/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_remote_sync.c
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@@ -158,13 +158,15 @@ int hyper_dmabuf_remote_sync(hyper_dmabuf_id_t hid, int ops)
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break;
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case HYPER_DMABUF_OPS_RELEASE:
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- dev_dbg(hy_drv_priv->dev,
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- "id:%d key:%d %d %d} released, ref left: %d\n",
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- exported->hid.id, exported->hid.rng_key[0],
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- exported->hid.rng_key[1], exported->hid.rng_key[2],
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- exported->active - 1);
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mutex_lock(&hy_drv_priv->lock);
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+ /* find a coresponding SGT for the id */
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+ exported = hyper_dmabuf_find_exported(hid);
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+ if (!exported) {
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+ mutex_unlock(&hy_drv_priv->lock);
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+ break;
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+ }
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+
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exported->active--;
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/* If there are still importers just break, if no then
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--
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https://clearlinux.org
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