[PATCH 2/2] pdc202xx_old: ignore "FIFO empty" bit in test_irq() method

[Sergei Shtylyov <sshtylyov@ru.mvista.com>]

The driver takes into account not only the interrupt status bit but also "FIFO
empty" bit in its test_irq() method. This actually is a superfluous check since
for the DMA commands calling the dma_test_irq() method further in the interrupt
handler makes sure FIFO is emptied.

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>

---
The patch is atop of ide-2.6.git tree...

Russell, would you mind giving this patch a test?

 drivers/ide/pdc202xx_old.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: ide-2.6/drivers/ide/pdc202xx_old.c
===================================================================
--- ide-2.6.orig/drivers/ide/pdc202xx_old.c
+++ ide-2.6/drivers/ide/pdc202xx_old.c
@@ -93,13 +93,13 @@ static int pdc202xx_test_irq(ide_hwif_t 
 		 * bit 7: error, bit 6: interrupting,
 		 * bit 5: FIFO full, bit 4: FIFO empty
 		 */
-		return ((sc1d & 0x50) == 0x50) ? 1 : 0;
+		return (sc1d & 0x40) ? 1 : 0;
 	} else	{
 		/*
 		 * bit 3: error, bit 2: interrupting,
 		 * bit 1: FIFO full, bit 0: FIFO empty
 		 */
-		return ((sc1d & 0x05) == 0x05) ? 1 : 0;
+		return (sc1d & 0x04) ? 1 : 0;
 	}
 }