dmaengine: fsl-edma: refactor chan_name setup and safety

Relocated the setup of chan_name from setup_irq() to fsl_chan init. This
change anticipates its future use in various locations.

For increased safety, sprintf has been replaced with snprintf. In addition,
The size of the fsl_chan->name[] array was expanded from 16 to 32.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20230821161617.2142561-10-Frank.Li@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/fsl-edma-common.h

@@ -116,7 +116,7 @@ struct fsl_edma_chan {
 	dma_addr_t			dma_dev_addr;
 	u32				dma_dev_size;
 	enum dma_data_direction		dma_dir;
-	char				chan_name[16];
+	char				chan_name[32];
 };
 
 struct fsl_edma_desc {

drivers/dma/fsl-edma-main.c

@@ -175,8 +175,6 @@ fsl_edma2_irq_init(struct platform_device *pdev,
 		if (irq < 0)
 			return -ENXIO;
 
-		sprintf(fsl_edma->chans[i].chan_name, "eDMA2-CH%02d", i);
-
 		/* The last IRQ is for eDMA err */
 		if (i == count - 1)
 			ret = devm_request_irq(&pdev->dev, irq,
@@ -313,6 +311,9 @@ static int fsl_edma_probe(struct platform_device *pdev)
 	for (i = 0; i < fsl_edma->n_chans; i++) {
 		struct fsl_edma_chan *fsl_chan = &fsl_edma->chans[i];
 
+		snprintf(fsl_chan->chan_name, sizeof(fsl_chan->chan_name), "%s-CH%02d",
+							   dev_name(&pdev->dev), i);
+
 		fsl_chan->edma = fsl_edma;
 		fsl_chan->pm_state = RUNNING;
 		fsl_chan->slave_id = 0;