[PATCH 45/48] staging: comedi: s626: use comedi_timeout()

H Hartley Sweeten hsweeten at visionengravers.com
Thu Feb 6 23:49:20 UTC 2014


Use comedi_timeout() to wait for the analog input end-of-conversion.

This prevents a deadlock condition that could occur by providing a
timeout in case the end-of-conversion does not happen.

Signed-off-by: H Hartley Sweeten <hsweeten at visionengravers.com>
Cc: Ian Abbott <abbotti at mev.co.uk>
Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 drivers/staging/comedi/drivers/s626.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/comedi/drivers/s626.c b/drivers/staging/comedi/drivers/s626.c
index 9e711ee..5ba4b4a 100644
--- a/drivers/staging/comedi/drivers/s626.c
+++ b/drivers/staging/comedi/drivers/s626.c
@@ -1846,6 +1846,20 @@ static int s626_ai_rinsn(struct comedi_device *dev,
 }
 #endif
 
+static int s626_ai_eoc(struct comedi_device *dev,
+		       struct comedi_subdevice *s,
+		       struct comedi_insn *insn,
+		       unsigned long context)
+{
+	struct s626_private *devpriv = dev->private;
+	unsigned int status;
+
+	status = readl(devpriv->mmio + S626_P_PSR);
+	if (status & S626_PSR_GPIO2)
+		return 0;
+	return -EBUSY;
+}
+
 static int s626_ai_insn_read(struct comedi_device *dev,
 			     struct comedi_subdevice *s,
 			     struct comedi_insn *insn, unsigned int *data)
@@ -1856,6 +1870,7 @@ static int s626_ai_insn_read(struct comedi_device *dev,
 	uint16_t adc_spec = 0;
 	uint32_t gpio_image;
 	uint32_t tmp;
+	int ret;
 	int n;
 
 	/*
@@ -1897,8 +1912,9 @@ static int s626_ai_insn_read(struct comedi_device *dev,
 		 */
 
 		/* Wait for ADC done */
-		while (!(readl(devpriv->mmio + S626_P_PSR) & S626_PSR_GPIO2))
-			;
+		ret = comedi_timeout(dev, s, insn, s626_ai_eoc, 0);
+		if (ret)
+			return ret;
 
 		/* Fetch ADC data */
 		if (n != 0) {
-- 
1.8.5.2



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