linux-kernel - [PATCH v3 08/10] dmaengine: idxd: Fix memory leak when a wq is reset

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Message-Id: <20260121-idxd-fix-flr-on-kernel-queues-v3-v3-8-7ed70658a9d1@intel.com>
Date: Wed, 21 Jan 2026 10:34:34 -0800
From: Vinicius Costa Gomes <vinicius.gomes@...el.com>
To: Dave Jiang <dave.jiang@...el.com>, Vinod Koul <vkoul@...nel.org>, 
 Dan Williams <dan.j.williams@...el.com>
Cc: dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Vinicius Costa Gomes <vinicius.gomes@...el.com>
Subject: [PATCH v3 08/10] dmaengine: idxd: Fix memory leak when a wq is
 reset

idxd_wq_disable_cleanup() which is called from the reset path for a
workqueue, sets the wq type to NONE, which for other parts of the
driver mean that the wq is empty (all its resources were released).

Only set the wq type to NONE after its resources are released.

Fixes: da32b28c95a7 ("dmaengine: idxd: cleanup workqueue config after disabling")
Reviewed-by: Dave Jiang <dave.jiang@...el.com>
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@...el.com>
---
 drivers/dma/idxd/device.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c
index 5e890b6771cb..efd7bfccc51f 100644
--- a/drivers/dma/idxd/device.c
+++ b/drivers/dma/idxd/device.c
@@ -175,6 +175,7 @@ void idxd_wq_free_resources(struct idxd_wq *wq)
 	free_descs(wq);
 	dma_free_coherent(dev, wq->compls_size, wq->compls, wq->compls_addr);
 	sbitmap_queue_free(&wq->sbq);
+	wq->type = IDXD_WQT_NONE;
 }
 EXPORT_SYMBOL_NS_GPL(idxd_wq_free_resources, "IDXD");
 
@@ -382,7 +383,6 @@ static void idxd_wq_disable_cleanup(struct idxd_wq *wq)
 	lockdep_assert_held(&wq->wq_lock);
 	wq->state = IDXD_WQ_DISABLED;
 	memset(wq->wqcfg, 0, idxd->wqcfg_size);
-	wq->type = IDXD_WQT_NONE;
 	wq->threshold = 0;
 	wq->priority = 0;
 	wq->enqcmds_retries = IDXD_ENQCMDS_RETRIES;
@@ -1558,7 +1558,6 @@ void idxd_drv_disable_wq(struct idxd_wq *wq)
 	idxd_wq_reset(wq);
 	idxd_wq_free_resources(wq);
 	percpu_ref_exit(&wq->wq_active);
-	wq->type = IDXD_WQT_NONE;
 	wq->client_count = 0;
 }
 EXPORT_SYMBOL_NS_GPL(idxd_drv_disable_wq, "IDXD");

-- 
2.52.0