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From: Lorenzo Bianconi <lorenzo@kernel.org>
Date: Wed, 7 Dec 2022 15:04:55 +0100
Subject: [PATCH] net: ethernet: mtk_wed: fix possible deadlock if
mtk_wed_wo_init fails
Introduce __mtk_wed_detach() in order to avoid a deadlock in
mtk_wed_attach routine if mtk_wed_wo_init fails since both
mtk_wed_attach and mtk_wed_detach run holding hw_lock mutex.
Fixes: 4c5de09eb0d0 ("net: ethernet: mtk_wed: add configure wed wo support")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
--- a/drivers/net/ethernet/mediatek/mtk_wed.c
+++ b/drivers/net/ethernet/mediatek/mtk_wed.c
@@ -619,12 +619,10 @@ mtk_wed_deinit(struct mtk_wed_device *de
}
static void
-mtk_wed_detach(struct mtk_wed_device *dev)
+__mtk_wed_detach(struct mtk_wed_device *dev)
{
struct mtk_wed_hw *hw = dev->hw;
- mutex_lock(&hw_lock);
-
mtk_wed_deinit(dev);
mtk_wdma_rx_reset(dev);
@@ -657,6 +655,13 @@ mtk_wed_detach(struct mtk_wed_device *de
module_put(THIS_MODULE);
hw->wed_dev = NULL;
+}
+
+static void
+mtk_wed_detach(struct mtk_wed_device *dev)
+{
+ mutex_lock(&hw_lock);
+ __mtk_wed_detach(dev);
mutex_unlock(&hw_lock);
}
@@ -1545,8 +1550,10 @@ mtk_wed_attach(struct mtk_wed_device *de
ret = mtk_wed_wo_init(hw);
}
out:
- if (ret)
- mtk_wed_detach(dev);
+ if (ret) {
+ dev_err(dev->hw->dev, "failed to attach wed device\n");
+ __mtk_wed_detach(dev);
+ }
unlock:
mutex_unlock(&hw_lock);
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