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staging: comedi: addi_apci_1500: Fix endian problem for command sample 

The digital input subdevice supports Comedi asynchronous commands that
read interrupt status information.  This uses 16-bit Comedi samples (of
which only the bottom 8 bits contain status information).  However, the
interrupt handler is calling `comedi_buf_write_samples()` with the
address of a 32-bit variable `unsigned int status`.  On a bigendian
machine, this will copy 2 bytes from the wrong end of the variable.  Fix
it by changing the type of the variable to `unsigned short`.

Fixes: a8c66b684e ("staging: comedi: addi_apci_1500: rewrite the subdevice support functions")
Cc: <stable@vger.kernel.org> #4.0+
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://lore.kernel.org/r/20210223143055.257402-3-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2021-02-23 14:30:43 +00:00 committed by Greg Kroah-Hartman
parent 25317f428a
commit ac0bbf55ed
1 changed files with 9 additions and 9 deletions
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18
drivers/staging/comedi/drivers/addi_apci_1500.c
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@ -208,7 +208,7 @@ static irqreturn_t apci1500_interrupt(int irq, void *d)
struct comedi_device *dev = d;
struct apci1500_private *devpriv = dev->private;
struct comedi_subdevice *s = dev->read_subdev;
unsigned int status = 0;
unsigned short status = 0;
unsigned int val;
val = inl(devpriv->amcc + AMCC_OP_REG_INTCSR);
@ -238,14 +238,14 @@ static irqreturn_t apci1500_interrupt(int irq, void *d)
*
* Mask Meaning
* ---------- ------------------------------------------
* 0x00000001 Event 1 has occurred
* 0x00000010 Event 2 has occurred
* 0x00000100 Counter/timer 1 has run down (not implemented)
* 0x00001000 Counter/timer 2 has run down (not implemented)
* 0x00010000 Counter 3 has run down (not implemented)
* 0x00100000 Watchdog has run down (not implemented)
* 0x01000000 Voltage error
* 0x10000000 Short-circuit error
* 0b00000001 Event 1 has occurred
* 0b00000010 Event 2 has occurred
* 0b00000100 Counter/timer 1 has run down (not implemented)
* 0b00001000 Counter/timer 2 has run down (not implemented)
* 0b00010000 Counter 3 has run down (not implemented)
* 0b00100000 Watchdog has run down (not implemented)
* 0b01000000 Voltage error
* 0b10000000 Short-circuit error
*/
comedi_buf_write_samples(s, &status, 1);
comedi_handle_events(dev, s);