spi: bcm2835: Remove shared interrupt support

This reverts commit ecfbd3cf since Lukas Wunner noticed that we
start operating on the hardware before we check to see if this is a
spurious interrupt.
Reported-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-bcm2835.c

@@ -379,10 +379,6 @@ static irqreturn_t bcm2835_spi_interrupt(int irq, void *dev_id)
 	if (bs->tx_len && cs & BCM2835_SPI_CS_DONE)
 		bcm2835_wr_fifo_blind(bs, BCM2835_SPI_FIFO_SIZE);
 
-	/* check if we got interrupt enabled */
-	if (!(bcm2835_rd(bs, BCM2835_SPI_CS) & BCM2835_SPI_CS_INTR))
-		return IRQ_NONE;
-
 	/* Read as many bytes as possible from FIFO */
 	bcm2835_rd_fifo(bs);
 	/* Write as many bytes as possible to FIFO */
@@ -1348,8 +1344,8 @@ static int bcm2835_spi_probe(struct platform_device *pdev)
 	bcm2835_wr(bs, BCM2835_SPI_CS,
 		   BCM2835_SPI_CS_CLEAR_RX | BCM2835_SPI_CS_CLEAR_TX);
 
-	err = devm_request_irq(&pdev->dev, bs->irq, bcm2835_spi_interrupt,
-			       IRQF_SHARED, dev_name(&pdev->dev), ctlr);
+	err = devm_request_irq(&pdev->dev, bs->irq, bcm2835_spi_interrupt, 0,
+			       dev_name(&pdev->dev), ctlr);
 	if (err) {
 		dev_err(&pdev->dev, "could not request IRQ: %d\n", err);
 		goto out_dma_release;