linux-kernel - [PATCH V2] dma: zynqmp_dma: Move list_del inside zynqmp_dma_free

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Message-Id: <20200506102844.2259-1-rafal.hibner@secom.com.pl>
Date:   Wed,  6 May 2020 12:28:45 +0200
From:   Rafał Hibner <rafal.hibner@...om.com.pl>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Rafał Hibner <rafal.hibner@...om.com.pl>,
        Appana Durga Kedareswara rao <appana.durga.rao@...inx.com>,
        Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>,
        Harini Katakam <harini.katakam@...inx.com>,
        Vinod Koul <vkoul@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Michal Simek <michal.simek@...inx.com>,
        dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH V2] dma: zynqmp_dma: Move list_del inside zynqmp_dma_free_descriptor.

List elements are not formally removed from list during zynqmp_dma_reset.

Signed-off-by: Rafal Hibner <rafal.hibner@...om.com.pl>
---
> Looking at this, i think it would make sense to do list_splice_init() before we
> send the list to be freed.

Moving list_del inside zynqmp_dma_free_descriptor fixes the problem just as well
and avoids INIT_LIST_HEAD(list).
I still don't see how list_splice_init would help here.

Regards,
Rafal

---
 drivers/dma/xilinx/zynqmp_dma.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/dma/xilinx/zynqmp_dma.c b/drivers/dma/xilinx/zynqmp_dma.c
index 931e41a72..df0403335 100644
--- a/drivers/dma/xilinx/zynqmp_dma.c
+++ b/drivers/dma/xilinx/zynqmp_dma.c
@@ -434,6 +434,7 @@ static void zynqmp_dma_free_descriptor(struct zynqmp_dma_chan *chan,
 	struct zynqmp_dma_desc_sw *child, *next;
 
 	chan->desc_free_cnt++;
+	list_del(&sdesc->node);
 	list_add_tail(&sdesc->node, &chan->free_list);
 	list_for_each_entry_safe(child, next, &sdesc->tx_list, node) {
 		chan->desc_free_cnt++;
@@ -604,8 +605,6 @@ static void zynqmp_dma_chan_desc_cleanup(struct zynqmp_dma_chan *chan)
 		dma_async_tx_callback callback;
 		void *callback_param;
 
-		list_del(&desc->node);
-
 		callback = desc->async_tx.callback;
 		callback_param = desc->async_tx.callback_param;
 		if (callback) {
-- 
2.20.1