Jerry Hoemann <jerry.hoemann@xxxxxxx> writes:
> On Tue, Nov 10, 2015 at 11:24:47AM -0500, Jeff Moyer wrote:
>> Jerry Hoemann <jerry.hoemann@xxxxxxx> writes:
>>
>> > @@ -633,10 +718,11 @@ static int match_dimm(struct device *dev, void *data)
>> >
>> > static long nvdimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
>> > {
>> > - int rc = -ENXIO, read_only;
>> > + int rc = -ENXIO, ro;
>> > struct nvdimm_bus *nvdimm_bus;
>> > + unsigned int type = _IOC_TYPE(cmd);
>> >
>> > - read_only = (O_RDWR != (file->f_flags & O_ACCMODE));
>> > + ro = (O_RDWR != (file->f_flags & O_ACCMODE));
>>
>> I'm still reviewing the rest of this, but this is bugging me. The
>> existing check for read_only looks pretty fishy to me. O_WRONLY is a
>> thing (even though it's probably not a supportable mode for this ioctl).
>> Why not just check for O_RDONLY?
>
>
> Good question. I'll look into changing for version 2.
> I suspect you would like something more like:
>
> ro = ((file->f_flags & O_ACCMODE) == O_RDONLY);
Yeah. I'd make that a separate patch, and put it first in the series
since it's a cleanup than can be applied to older kernels if necessary.
Thanks,
Jeff
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