openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

staging: comedi: me4000: Fix endian problem for AI command data 

The analog input subdevice supports Comedi asynchronous commands that
use Comedi's 16-bit sample format.  However, the calls to
`comedi_buf_write_samples()` are passing the address of a 32-bit integer
variable.  On bigendian machines, this will copy 2 bytes from the wrong
end of the 32-bit value.  Fix it by changing the type of the variable
holding the sample value to `unsigned short`.

Fixes: de88924f67 ("staging: comedi: me4000: use comedi_buf_write_samples()")
Cc: <stable@vger.kernel.org> # 3.19+
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://lore.kernel.org/r/20210223143055.257402-8-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2021-02-23 14:30:48 +00:00 committed by Greg Kroah-Hartman
parent 54999c0d94
commit b39dfcced3
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/staging/comedi/drivers/me4000.c
View File

@ -924,7 +924,7 @@ static irqreturn_t me4000_ai_isr(int irq, void *dev_id)
struct comedi_subdevice *s = dev->read_subdev;
int i;
int c = 0;
unsigned int lval;
unsigned short lval;
if (!dev->attached)
return IRQ_NONE;