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59 lines
1.5 KiB
Diff
59 lines
1.5 KiB
Diff
From: Lorenzo Bianconi <lorenzo@kernel.org>
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Date: Wed, 7 Dec 2022 15:04:55 +0100
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Subject: [PATCH] net: ethernet: mtk_wed: fix possible deadlock if
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mtk_wed_wo_init fails
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Introduce __mtk_wed_detach() in order to avoid a deadlock in
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mtk_wed_attach routine if mtk_wed_wo_init fails since both
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mtk_wed_attach and mtk_wed_detach run holding hw_lock mutex.
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Fixes: 4c5de09eb0d0 ("net: ethernet: mtk_wed: add configure wed wo support")
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Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
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Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
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Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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---
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--- a/drivers/net/ethernet/mediatek/mtk_wed.c
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+++ b/drivers/net/ethernet/mediatek/mtk_wed.c
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@@ -619,12 +619,10 @@ mtk_wed_deinit(struct mtk_wed_device *de
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}
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static void
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-mtk_wed_detach(struct mtk_wed_device *dev)
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+__mtk_wed_detach(struct mtk_wed_device *dev)
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{
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struct mtk_wed_hw *hw = dev->hw;
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- mutex_lock(&hw_lock);
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-
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mtk_wed_deinit(dev);
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mtk_wdma_rx_reset(dev);
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@@ -657,6 +655,13 @@ mtk_wed_detach(struct mtk_wed_device *de
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module_put(THIS_MODULE);
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hw->wed_dev = NULL;
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+}
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+
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+static void
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+mtk_wed_detach(struct mtk_wed_device *dev)
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+{
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+ mutex_lock(&hw_lock);
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+ __mtk_wed_detach(dev);
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mutex_unlock(&hw_lock);
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}
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@@ -1538,8 +1543,10 @@ mtk_wed_attach(struct mtk_wed_device *de
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ret = mtk_wed_wo_init(hw);
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}
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out:
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- if (ret)
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- mtk_wed_detach(dev);
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+ if (ret) {
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+ dev_err(dev->hw->dev, "failed to attach wed device\n");
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+ __mtk_wed_detach(dev);
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+ }
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unlock:
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mutex_unlock(&hw_lock);
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