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| author |   Ian Abbott <abbotti@mev.co.uk> | 2021-02-23 14:30:53 +0000 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-10 09:23:29 +0100 |
| commit | 33444638ae54fa2eb8e9269d70ce2d5bc8b52751 (patch) | |
| tree | 35951031ab215259936b97e961fcac8a0412e33e /drivers/staging/comedi/drivers/ni_6527.c | |
| parent | staging: comedi: comedi_parport: Use 16-bit 0 for interrupt data (diff) | |
| download | linux-dev-33444638ae54fa2eb8e9269d70ce2d5bc8b52751.tar.xz linux-dev-33444638ae54fa2eb8e9269d70ce2d5bc8b52751.zip | |
staging: comedi: ni_6527: Use 16-bit 0 for interrupt data
The ni_6527 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/20210223143055.257402-13-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/comedi/drivers/ni_6527.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/ni_6527.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/staging/comedi/drivers/ni_6527.c b/drivers/staging/comedi/drivers/ni_6527.c index 99e744172f4d..f1a45cf7342a 100644 --- a/drivers/staging/comedi/drivers/ni_6527.c +++ b/drivers/staging/comedi/drivers/ni_6527.c @@ -195,7 +195,9 @@ static irqreturn_t ni6527_interrupt(int irq, void *d) return IRQ_NONE; if (status & NI6527_STATUS_EDGE) { - comedi_buf_write_samples(s, &s->state, 1); + unsigned short val = 0; + + comedi_buf_write_samples(s, &val, 1); comedi_handle_events(dev, s); } |