media: dvb_frontend: fix return values for FE_SET_PROPERTY

There are several problems with regards to the return of
FE_SET_PROPERTY. The original idea were to return per-property
return codes via tvp->result field, and to return an updated
set of values.

However, that never worked. What's actually implemented is:

- the FE_SET_PROPERTY implementation doesn't call .get_frontend
  callback in order to get the actual parameters after return;

- the tvp->result field is only filled if there's no error.
  So, it is always filled with zero;

- FE_SET_PROPERTY doesn't call memdup_user() nor any other
  copy_to_user() function. So, any changes to the properties
  will be lost;

- FE_SET_PROPERTY is declared as a write-only ioctl (IOW).

While we could fix the above, it could cause regressions.

So, let's just assume what the code really does, updating
the documentation accordingly and removing the logic that
would update the discarded tvp->result.

Reviewed-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2017-09-18 08:21:37 -04:00
Родитель da5516b5e8
Коммит 259a41d9ae
3 изменённых файлов: 6 добавлений и 5 удалений

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@ -48,8 +48,11 @@ depends on the delivery system and on the device:
- This call requires read/write access to the device.
- At return, the values are updated to reflect the actual parameters
used.
.. note::
At return, the values aren't updated to reflect the actual
parameters used. If the actual parameters are needed, an explicit
call to ``FE_GET_PROPERTY`` is needed.
- ``FE_GET_PROPERTY:``

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@ -2125,7 +2125,6 @@ static int dvb_frontend_handle_ioctl(struct file *file,
kfree(tvp);
return err;
}
(tvp + i)->result = err;
}
kfree(tvp);
break;
@ -2170,7 +2169,6 @@ static int dvb_frontend_handle_ioctl(struct file *file,
kfree(tvp);
return err;
}
(tvp + i)->result = err;
}
if (copy_to_user((void __user *)tvps->props, tvp,

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@ -830,7 +830,7 @@ struct dtv_fe_stats {
* @cmd: Digital TV command.
* @reserved: Not used.
* @u: Union with the values for the command.
* @result: Result of the command set (currently unused).
* @result: Unused
*
* The @u union may have either one of the values below:
*