dmaengine: imx-dma: convert tasklets to use new tasklet_setup() API

In preparation for unconditionally passing the
struct tasklet_struct pointer to all tasklet
callbacks, switch to using the new tasklet_setup()
and from_tasklet() to pass the tasklet pointer explicitly.

Signed-off-by: Romain Perier <[e-mail]>
Signed-off-by: Allen Pais <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/imx-dma.c

···
 	return 0;
 }
 
-static void imxdma_tasklet(unsigned long data)
+static void imxdma_tasklet(struct tasklet_struct *t)
 {
-	struct imxdma_channel *imxdmac = (void *)data;
+	struct imxdma_channel *imxdmac = from_tasklet(imxdmac, t, dma_tasklet);
 	struct imxdma_engine *imxdma = imxdmac->imxdma;
 	struct imxdma_desc *desc, *next_desc;
 	unsigned long flags;
···
 		INIT_LIST_HEAD(&imxdmac->ld_free);
 		INIT_LIST_HEAD(&imxdmac->ld_active);
 
-		tasklet_init(&imxdmac->dma_tasklet, imxdma_tasklet,
-			     (unsigned long)imxdmac);
+		tasklet_setup(&imxdmac->dma_tasklet, imxdma_tasklet);
 		imxdmac->chan.device = &imxdma->dma_device;
 		dma_cookie_init(&imxdmac->chan);
 		imxdmac->channel = i;