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| author | Al Viro <viro@zeniv.linux.org.uk> | 2018-09-14 05:12:15 +0300 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2018-10-13 07:50:53 +0300 |
| commit | f0193d3ea73b966b5dbfa272c8228d743b8856ef (patch) | |
| tree | c882a171c8706f274a7e09d8f7297c36ed750e34 /drivers/input | |
| parent | 7ee329655189f32f0c17e0bad60c23a69b003e9e (diff) | |
| download | linux-f0193d3ea73b966b5dbfa272c8228d743b8856ef.tar.xz | |
change semantics of ldisc ->compat_ioctl()
First of all, make it return int. Returning long when native method
had never allowed that is ridiculous and inconvenient.
More importantly, change the caller; if ldisc ->compat_ioctl() is NULL
or returns -ENOIOCTLCMD, tty_compat_ioctl() will try to feed cmd and
compat_ptr(arg) to ldisc's native ->ioctl().
That simplifies ->compat_ioctl() instances quite a bit - they only
need to deal with ioctls that are neither generic tty ones (those
would get shunted off to tty_ioctl()) nor simple compat pointer ones.
Note that something like TCFLSH won't reach ->compat_ioctl(),
even if ldisc ->ioctl() does handle it - it will be recognized
earlier and passed to tty_ioctl() (and ultimately - ldisc ->ioctl()).
For many ldiscs it means that NULL ->compat_ioctl() does the
right thing. Those where it won't serve (see e.g. n_r3964.c) are
also easily dealt with - we need to handle the numeric-argument
ioctls (calling the native instance) and, if such would exist,
the ioctls that need layout conversion, etc.
All in-tree ldiscs dealt with.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'drivers/input')
| -rw-r--r-- | drivers/input/serio/serport.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/input/serio/serport.c b/drivers/input/serio/serport.c index f8ead9f9c77e..5977b8a34ebe 100644 --- a/drivers/input/serio/serport.c +++ b/drivers/input/serio/serport.c @@ -226,7 +226,7 @@ static int serport_ldisc_ioctl(struct tty_struct *tty, struct file *file, #ifdef CONFIG_COMPAT #define COMPAT_SPIOCSTYPE _IOW('q', 0x01, compat_ulong_t) -static long serport_ldisc_compat_ioctl(struct tty_struct *tty, +static int serport_ldisc_compat_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) { |