Re: [PATCH v2] dmaengine: mediatek: Fix a possible deadlock error in mtk_cqdma_tx_status()

On Thu, 08 May 2025 15:36:33 +0800, Qiu-ji Chen wrote:

Fix a potential deadlock bug. Observe that in the mtk-cqdma.c file, functions like mtk_cqdma_issue_pending() and mtk_cqdma_free_active_desc() properly acquire the pc lock before the vc lock when handling pc and vc fields. However, mtk_cqdma_tx_status() violates this order by first acquiring the vc lock before invoking mtk_cqdma_find_active_desc(), which subsequently takes the pc lock. This reversed locking sequence (vc → pc) contradicts the established pc → vc order and creates deadlock risks.

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Applied, thanks!

[1/1] dmaengine: mediatek: Fix a possible deadlock error in mtk_cqdma_tx_status() commit: 157ae5ffd76a2857ccb4b7ce40bc5a344ca00395

Best regards,