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Mon, 10 Aug 2026 11:12:30 -0700 (PDT) From: Allen Pais To: Vinod Koul , Frank Li Cc: Allen Pais , dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, Arnd Bergmann , Kees Cook , Linus Walleij , linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 17/34] dmaengine: ste_dma40: convert per-channel tasklet to dmaengine BH Date: Mon, 10 Aug 2026 11:09:18 -0700 Message-ID: <72495a21d3eb7ef735400e1a52deb24f3e70c944.1786384168.git.allen.lkml@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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: Linus Walleij --- drivers/dma/ste_dma40.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c index 0d9ffa3e2663..e6dfa1fc5e5a 100644 --- a/drivers/dma/ste_dma40.c +++ b/drivers/dma/ste_dma40.c @@ -461,8 +461,6 @@ struct d40_base; * @phy_chan: Pointer to physical channel which this instance runs on. If this * point is NULL, then the channel is not allocated. * @chan: DMA engine handle. - * @tasklet: Tasklet that gets scheduled from interrupt context to complete a - * transfer and call client callback. * @client: Cliented owned descriptor list. * @pending_queue: Submitted jobs, to be issued by issue_pending() * @active: Active descriptor. @@ -489,7 +487,6 @@ struct d40_chan { bool busy; struct d40_phy_res *phy_chan; struct dma_chan chan; - struct tasklet_struct tasklet; struct list_head client; struct list_head pending_queue; struct list_head active; @@ -1587,13 +1584,13 @@ static void dma_tc_handle(struct d40_chan *d40c) } d40c->pending_tx++; - tasklet_schedule(&d40c->tasklet); + dmaengine_schedule_bh(&d40c->chan); } -static void dma_tasklet(struct tasklet_struct *t) +static void dma_tasklet(struct dma_chan *chan) { - struct d40_chan *d40c = from_tasklet(d40c, t, tasklet); + struct d40_chan *d40c = container_of(chan, struct d40_chan, chan); struct d40_desc *d40d; unsigned long flags; bool callback_active; @@ -1641,7 +1638,7 @@ static void dma_tasklet(struct tasklet_struct *t) d40c->pending_tx--; if (d40c->pending_tx) - tasklet_schedule(&d40c->tasklet); + dmaengine_schedule_bh(&d40c->chan); spin_unlock_irqrestore(&d40c->lock, flags); @@ -2815,7 +2812,7 @@ static void __init d40_chan_init(struct d40_base *base, struct dma_device *dma, INIT_LIST_HEAD(&d40c->client); INIT_LIST_HEAD(&d40c->prepare_queue); - tasklet_setup(&d40c->tasklet, dma_tasklet); + dmaengine_init_bh(&d40c->chan, dma_tasklet); list_add_tail(&d40c->chan.device_node, &dma->channels); -- 2.43.0