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staging: comedi: s626: use comedi_timeout() 

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@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2014-02-10 11:49:37 -07:00 committed by Greg Kroah-Hartman
parent 051448c525
commit 45b281e457
1 changed files with 18 additions and 2 deletions
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20
drivers/staging/comedi/drivers/s626.c
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@ -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) {