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staging: comedi: ni_mio_common: fix interrupt handler for dev->read_subdev 

There may not be a dev->read_subdev, i.e. an analog input subdevice, that
supports async commands. If it doesn't exist the interrupt/dma will never
be enabled.  Fix ni_E_interrupt() so that the analog input subdevice is
only handled if it exists.

This also fixes minor NULL dereference issue in handle_a_interrupt().
If the dev->read_subdev is NULL the comedi_async pointer (s->async) will
not be allocated by the device postconfig so there is no way to get a
valid comedi_cmd (&s->async->cmd).

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 2016-04-21 12:04:41 -07:00 committed by Greg Kroah-Hartman
parent 4b2d73898f
commit ba5c0da886
1 changed files with 9 additions and 13 deletions
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22
drivers/staging/comedi/drivers/ni_mio_common.c
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@ -1288,19 +1288,13 @@ static void ack_a_interrupt(struct comedi_device *dev, unsigned short a_status)
ni_stc_writew(dev, ack, NISTC_INTA_ACK_REG);
}
static void handle_a_interrupt(struct comedi_device *dev, unsigned short status,
static void handle_a_interrupt(struct comedi_device *dev,
struct comedi_subdevice *s,
unsigned short status,
unsigned int ai_mite_status)
{
struct comedi_subdevice *s = dev->read_subdev;
struct comedi_cmd *cmd = &s->async->cmd;
/*
* 67xx boards don't have ai subdevice, but their gpct0 might
* generate an a interrupt.
*/
if (s->type == COMEDI_SUBD_UNUSED)
return;
#ifdef PCIDMA
if (ai_mite_status & CHSR_LINKC)
ni_sync_ai_dma(dev);
@ -5148,6 +5142,7 @@ static int ni_gpct_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
static irqreturn_t ni_E_interrupt(int irq, void *d)
{
struct comedi_device *dev = d;
struct comedi_subdevice *s_ai = dev->read_subdev;
struct comedi_subdevice *s_ao = dev->write_subdev;
unsigned short a_status;
unsigned short b_status;
@ -5171,9 +5166,9 @@ static irqreturn_t ni_E_interrupt(int irq, void *d)
unsigned int m_status;
spin_lock_irqsave(&devpriv->mite_channel_lock, flags_too);
if (devpriv->ai_mite_chan)
if (s_ai && devpriv->ai_mite_chan)
ai_mite_status = mite_ack_linkc(devpriv->ai_mite_chan,
dev->read_subdev);
s_ai);
if (s_ao && devpriv->ao_mite_chan) {
m_status = mite_ack_linkc(devpriv->ao_mite_chan, s_ao);
@ -5186,8 +5181,9 @@ static irqreturn_t ni_E_interrupt(int irq, void *d)
#endif
ack_a_interrupt(dev, a_status);
ack_b_interrupt(dev, b_status);
if ((a_status & NISTC_AI_STATUS1_INTA) || (ai_mite_status & CHSR_INT))
handle_a_interrupt(dev, a_status, ai_mite_status);
if (s_ai &&
((a_status & NISTC_AI_STATUS1_INTA) || (ai_mite_status & CHSR_INT)))
handle_a_interrupt(dev, s_ai, a_status, ai_mite_status);
if (s_ao) {
if (b_status & NISTC_AO_STATUS1_INTB)
handle_b_interrupt(dev, s_ao, b_status);