59 lines
1.5 KiB
Diff
59 lines
1.5 KiB
Diff
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);
|
|
}
|
|
|
|
@@ -1538,8 +1543,10 @@ 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);
|
|
|