From: Dmitry Osipenko <digetx@gmail.com>
Date: Sun, 9 Feb 2020 19:33:42 +0300
Subject: dmaengine: tegra-apb: Clean up tasklet releasing

Git-commit: 41ffc423e117782309e3a409d61507bf7b77719c
Patch-mainline: v5.7-rc1
References: jsc#SLE-15847

There is no need to kill tasklet when driver's probe fails because tasklet
can't be scheduled at this time. It is also cleaner to kill tasklet on
channel's freeing rather than to kill it on driver's removal, otherwise
tasklet could perform a dummy execution after channel's releasing, which
isn't very nice.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Link: https://lore.kernel.org/r/20200209163356.6439-6-digetx@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
 drivers/dma/tegra20-apb-dma.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index 81a2b5f4181f..f2ef940c4e2a 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -1291,7 +1291,6 @@ static void tegra_dma_free_chan_resources(struct dma_chan *dc)
 	struct tegra_dma_sg_req *sg_req;
 	struct list_head dma_desc_list;
 	struct list_head sg_req_list;
-	unsigned long flags;
 
 	INIT_LIST_HEAD(&dma_desc_list);
 	INIT_LIST_HEAD(&sg_req_list);
@@ -1299,15 +1298,14 @@ static void tegra_dma_free_chan_resources(struct dma_chan *dc)
 	dev_dbg(tdc2dev(tdc), "Freeing channel %d\n", tdc->id);
 
 	tegra_dma_terminate_all(dc);
+	tasklet_kill(&tdc->tasklet);
 
-	spin_lock_irqsave(&tdc->lock, flags);
 	list_splice_init(&tdc->pending_sg_req, &sg_req_list);
 	list_splice_init(&tdc->free_sg_req, &sg_req_list);
 	list_splice_init(&tdc->free_dma_desc, &dma_desc_list);
 	INIT_LIST_HEAD(&tdc->cb_desc);
 	tdc->config_init = false;
 	tdc->isr_handler = NULL;
-	spin_unlock_irqrestore(&tdc->lock, flags);
 
 	while (!list_empty(&dma_desc_list)) {
 		dma_desc = list_first_entry(&dma_desc_list,
@@ -1546,7 +1544,6 @@ static int tegra_dma_probe(struct platform_device *pdev)
 		struct tegra_dma_channel *tdc = &tdma->channels[i];
 
 		free_irq(tdc->irq, tdc);
-		tasklet_kill(&tdc->tasklet);
 	}
 
 	pm_runtime_disable(&pdev->dev);
@@ -1566,7 +1563,6 @@ static int tegra_dma_remove(struct platform_device *pdev)
 	for (i = 0; i < tdma->chip_data->nr_channels; ++i) {
 		tdc = &tdma->channels[i];
 		free_irq(tdc->irq, tdc);
-		tasklet_kill(&tdc->tasklet);
 	}
 
 	pm_runtime_disable(&pdev->dev);
-- 
2.26.2