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authorIan Abbott <abbotti@mev.co.uk>2021-02-23 14:30:55 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-03-10 09:23:30 +0100
commitfd3ce6557da0e7557a451ee56fc8f5700d3bd08f (patch)
tree9a44327ed825360b002b29d6c43b5726194c79b8 /drivers
parent5ff1c08c28c331eee1ac6a02e8e3eabb329fa953 (diff)
staging: comedi: pcl726: Use 16-bit 0 for interrupt data
The pcl726 driver has an "interrupt" subdevice that supports Comedi asynchronous commands, placing a value in the Comedi buffer for each interrupt. The subdevice uses Comedi's 16-bit sample format but the interrupt handler is calling `comedi_buf_write_samples()` with the address of a 32-bit integer `&s->state`. On bigendian machines, this will copy 2 bytes from the wrong end of the 32-bit integer. This isn't really a problem since `s->state` will always be 0 for this subdevice, but clean it up by using a 16-bit variable initialized to 0 to pass the value. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Link: https://lore.kernel.org/r/20210223143055.257402-15-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/staging/comedi/drivers/pcl726.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/staging/comedi/drivers/pcl726.c b/drivers/staging/comedi/drivers/pcl726.c
index 64eb649c9813..88f25d7e76f7 100644
--- a/drivers/staging/comedi/drivers/pcl726.c
+++ b/drivers/staging/comedi/drivers/pcl726.c
@@ -220,9 +220,11 @@ static irqreturn_t pcl726_interrupt(int irq, void *d)
struct pcl726_private *devpriv = dev->private;
if (devpriv->cmd_running) {
+ unsigned short val = 0;
+
pcl726_intr_cancel(dev, s);
- comedi_buf_write_samples(s, &s->state, 1);
+ comedi_buf_write_samples(s, &val, 1);
comedi_handle_events(dev, s);
}