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

drivers/dma/plx_dma.c

···
 	rcu_read_unlock();
 }
 
-static void plx_dma_desc_task(unsigned long data)
+static void plx_dma_desc_task(struct tasklet_struct *t)
 {
-	struct plx_dma_dev *plxdev = (void *)data;
+	struct plx_dma_dev *plxdev = from_tasklet(plxdev, t, desc_task);
 
 	plx_dma_process_desc(plxdev);
 }
···
 	}
 
 	spin_lock_init(&plxdev->ring_lock);
-	tasklet_init(&plxdev->desc_task, plx_dma_desc_task,
-		     (unsigned long)plxdev);
+	tasklet_setup(&plxdev->desc_task, plx_dma_desc_task);
 
 	RCU_INIT_POINTER(plxdev->pdev, pdev);
 	plxdev->bar = pcim_iomap_table(pdev)[0];