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staging: comedi: amplc_dio200_common: remove 'spinlock' from struct dio200_subdev_8254 

Currently this driver uses a spinlock in the 8254 subdevice (*insn_read), (*insn_write),
and (*insn_config) functions. The comedi core checks if the subdevice is 'busy', in
parse_insn(), before any of the subdevice functions are attempted.

Remove the unnecessary spinlock.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2015-02-23 14:58:00 -07:00 committed by Greg Kroah-Hartman
parent ed023d529c
commit 99ca4e4613
1 changed files with 5 additions and 18 deletions
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23
drivers/staging/comedi/drivers/amplc_dio200_common.c
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@ -101,7 +101,6 @@ struct dio200_subdev_8254 {
unsigned int ofs; /* Counter base offset */
unsigned int clock_src[3]; /* Current clock sources */
unsigned int gate_src[3]; /* Current gate sources */
spinlock_t spinlock;
};
struct dio200_subdev_8255 {
@ -535,16 +534,12 @@ static int dio200_subdev_8254_read(struct comedi_device *dev,
struct comedi_insn *insn,
unsigned int *data)
{
struct dio200_subdev_8254 *subpriv = s->private;
int chan = CR_CHAN(insn->chanspec);
unsigned int n;
unsigned long flags;
for (n = 0; n < insn->n; n++) {
spin_lock_irqsave(&subpriv->spinlock, flags);
for (n = 0; n < insn->n; n++)
data[n] = dio200_subdev_8254_read_chan(dev, s, chan);
spin_unlock_irqrestore(&subpriv->spinlock, flags);
}
return insn->n;
}
@ -553,16 +548,12 @@ static int dio200_subdev_8254_write(struct comedi_device *dev,
struct comedi_insn *insn,
unsigned int *data)
{
struct dio200_subdev_8254 *subpriv = s->private;
int chan = CR_CHAN(insn->chanspec);
unsigned int n;
unsigned long flags;
for (n = 0; n < insn->n; n++) {
spin_lock_irqsave(&subpriv->spinlock, flags);
for (n = 0; n < insn->n; n++)
dio200_subdev_8254_write_chan(dev, s, chan, data[n]);
spin_unlock_irqrestore(&subpriv->spinlock, flags);
}
return insn->n;
}
@ -643,12 +634,9 @@ static int dio200_subdev_8254_config(struct comedi_device *dev,
struct comedi_insn *insn,
unsigned int *data)
{
struct dio200_subdev_8254 *subpriv = s->private;
int ret = 0;
int chan = CR_CHAN(insn->chanspec);
unsigned long flags;
spin_lock_irqsave(&subpriv->spinlock, flags);
switch (data[0]) {
case INSN_CONFIG_SET_COUNTER_MODE:
if (data[1] > (I8254_MODE5 | I8254_BCD))
@ -689,7 +677,7 @@ static int dio200_subdev_8254_config(struct comedi_device *dev,
ret = -EINVAL;
break;
}
spin_unlock_irqrestore(&subpriv->spinlock, flags);
return ret < 0 ? ret : insn->n;
}
@ -713,7 +701,6 @@ static int dio200_subdev_8254_init(struct comedi_device *dev,
s->insn_write = dio200_subdev_8254_write;
s->insn_config = dio200_subdev_8254_config;
spin_lock_init(&subpriv->spinlock);
subpriv->ofs = offset;
/* Initialize channels. */