spi: dw: Make debugfs use bus num and make irq name unique

Instead of using device name it was suggested that bus number was more
appropriate to differentiate debugfs names. Also reduce buffer size to
more realistic 32 bytes instead of 128.

When request_irq is called the bus number may not be assigned. Therefore
the irq name was not unique when dynamic bus number was being used.
As per most of the spi drivers use the device name instead. No other
use of dws->name could be found so it was removed.
Signed-off-by: NPhil Reid <preid@electromag.com.au>
Signed-off-by: NMark Brown <broonie@kernel.org>

drivers/spi/spi-dw.c

@@ -107,9 +107,9 @@ static const struct file_operations dw_spi_regs_ops = {
 
 static int dw_spi_debugfs_init(struct dw_spi *dws)
 {
-	char name[128];
+	char name[32];
 
-	snprintf(name, 128, "dw_spi-%s", dev_name(&dws->master->dev));
+	snprintf(name, 32, "dw_spi%d", dws->master->bus_num);
 	dws->debugfs = debugfs_create_dir(name, NULL);
 	if (!dws->debugfs)
 		return -ENOMEM;
@@ -486,9 +486,9 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
 	dws->type = SSI_MOTO_SPI;
 	dws->dma_inited = 0;
 	dws->dma_addr = (dma_addr_t)(dws->paddr + DW_SPI_DR);
-	snprintf(dws->name, sizeof(dws->name), "dw_spi%d", dws->bus_num);
 
-	ret = request_irq(dws->irq, dw_spi_irq, IRQF_SHARED, dws->name, master);
+	ret = request_irq(dws->irq, dw_spi_irq, IRQF_SHARED, dev_name(dev),
+			  master);
 	if (ret < 0) {
 		dev_err(dev, "can not get IRQ\n");
 		goto err_free_master;

drivers/spi/spi-dw.h

@@ -101,7 +101,6 @@ struct dw_spi_dma_ops {
 struct dw_spi {
 	struct spi_master	*master;
 	enum dw_ssi_type	type;
-	char			name[16];
 
 	void __iomem		*regs;
 	unsigned long		paddr;