The read/write of the PLX_INTRCS_REG during the driver detach is not
necessary. The rtd_reset() function writes 0 to this register which
will disable all interrupts.
This also fixes a dereference after null check reported by coverity.
Reported-by: coverity (CID 751066)
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/drivers/rtd520.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/drivers/staging/comedi/drivers/rtd520.c b/drivers/staging/comedi/drivers/rtd520.c
index c94ad12..f9473f9 100644
--- a/drivers/staging/comedi/drivers/rtd520.c
+++ b/drivers/staging/comedi/drivers/rtd520.c
@@ -1299,12 +1299,8 @@ static void rtd_detach(struct comedi_device *dev)
/* Shut down any board ops by resetting it */
if (dev->mmio && devpriv->lcfg)
rtd_reset(dev);
- if (dev->irq) {
- writel(readl(devpriv->lcfg + PLX_INTRCS_REG) &
- ~(ICS_PLIE | ICS_DMA0_E | ICS_DMA1_E),
- devpriv->lcfg + PLX_INTRCS_REG);
+ if (dev->irq)
free_irq(dev->irq, dev);
- }
if (dev->mmio)
iounmap(dev->mmio);
if (devpriv->las1)
--
2.3.0
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