dmaengine: pch_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/pch_dma.c

···
 	return 0;
 }
 
-static void pdc_tasklet(unsigned long data)
+static void pdc_tasklet(struct tasklet_struct *t)
 {
-	struct pch_dma_chan *pd_chan = (struct pch_dma_chan *)data;
+	struct pch_dma_chan *pd_chan = from_tasklet(pd_chan, t, tasklet);
 	unsigned long flags;
 
 	if (!pdc_is_idle(pd_chan)) {
···
 		INIT_LIST_HEAD(&pd_chan->queue);
 		INIT_LIST_HEAD(&pd_chan->free_list);
 
-		tasklet_init(&pd_chan->tasklet, pdc_tasklet,
-			     (unsigned long)pd_chan);
+		tasklet_setup(&pd_chan->tasklet, pdc_tasklet);
 		list_add_tail(&pd_chan->chan.device_node, &pd->dma.channels);
 	}