[lkml]   [2011]   [Jun]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] FE_GET_PROPERTY should be _IOW, because the associated structure is transferred from userspace to kernelspace. Keep the old ioctl around for compatibility so that existing code is not broken.
On 06/01/2011 11:15 PM, Mauro Carvalho Chehab wrote:
> The dvb_usercopy will do the right thing, if we use _IOR or _IORW.

It only works, because _IOC_READ triggers a copy_from_user, as a
workaround for wrongly marked ioctls like this, according to a code
comment. It does not really do the right thing, because in this special
case the later call to copy_to_user isn't required. But it doesn't do
any real harm either.

> I prefer to not apply this patch, as it won't fix anything. Adding an _OLD means
> that we'll need later to remove it, causing a regression. Ok, we may do like we did
> with V4L _OLD ioctl's that were marked as _OLD at 2.6.5 and were removed on a late
> 2.6.3x.

Either way is fine for me.


 \ /
  Last update: 2011-06-03 14:47    [W:0.094 / U:50.348 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site