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Tue, 10 Nov 2026 05:15:53 -0800 (PST) Received: from cryptic.lan ([2001:569:7077:be00:8191:2bfc:aa6d:704b]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3b16769b589sm3806975a91.5.2026.11.10.05.15.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Nov 2026 05:15:53 -0800 (PST) From: Allen Pais To: Vinod Koul Cc: Allen Pais , Frank Li , Arnd Bergmann , dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, Frank Li Subject: [PATCH v4 05/33] dmaengine: ep93xx: hook callbacks via dmaengine BH Date: Tue, 10 Nov 2026 05:13:05 -0800 Message-ID: X-Mailer: git-send-email 2.43.0 In-Reply-To: References: X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Replace the per-channel tasklet with the shared dmaengine BH helper. The handler continues to run in softirq context while dmaengine owns the common scheduling and teardown mechanism. Signed-off-by: Allen Pais Reviewed-by: Frank Li --- drivers/dma/ep93xx_dma.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/drivers/dma/ep93xx_dma.c b/drivers/dma/ep93xx_dma.c index 8a0b66a7d886..b073d9164e83 100644 --- a/drivers/dma/ep93xx_dma.c +++ b/drivers/dma/ep93xx_dma.c @@ -167,7 +167,6 @@ struct ep93xx_dma_chan_cfg { * @dma_cfg: channel number, direction * @irq: interrupt number of the channel * @clk: clock used by this channel - * @tasklet: channel specific tasklet used for callbacks * @lock: lock protecting the fields following * @flags: flags for the channel * @buffer: which buffer to use next (0/1) @@ -196,7 +195,6 @@ struct ep93xx_dma_chan { struct ep93xx_dma_chan_cfg dma_cfg; int irq; struct clk *clk; - struct tasklet_struct tasklet; /* protects the fields following */ spinlock_t lock; unsigned long flags; @@ -796,9 +794,9 @@ static void ep93xx_dma_advance_work(struct ep93xx_dma_chan *edmac) spin_unlock_irqrestore(&edmac->lock, flags); } -static void ep93xx_dma_tasklet(struct tasklet_struct *t) +static void ep93xx_dma_tasklet(struct dma_chan *chan) { - struct ep93xx_dma_chan *edmac = from_tasklet(edmac, t, tasklet); + struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan); struct ep93xx_dma_desc *desc, *d; struct dmaengine_desc_callback cb; LIST_HEAD(list); @@ -853,12 +851,12 @@ static irqreturn_t ep93xx_dma_interrupt(int irq, void *dev_id) switch (edmac->edma->hw_interrupt(edmac)) { case INTERRUPT_DONE: desc->complete = true; - tasklet_schedule(&edmac->tasklet); + dmaengine_schedule_bh(&edmac->chan); break; case INTERRUPT_NEXT_BUFFER: if (test_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags)) - tasklet_schedule(&edmac->tasklet); + dmaengine_schedule_bh(&edmac->chan); break; default: @@ -1414,7 +1412,7 @@ static struct ep93xx_dma_engine *ep93xx_dma_of_probe(struct platform_device *pde INIT_LIST_HEAD(&edmac->active); INIT_LIST_HEAD(&edmac->queue); INIT_LIST_HEAD(&edmac->free_list); - tasklet_setup(&edmac->tasklet, ep93xx_dma_tasklet); + dmaengine_init_bh(&edmac->chan, ep93xx_dma_tasklet); list_add_tail(&edmac->chan.device_node, &dma_dev->channels); -- 2.43.0