diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2018-09-13 22:12:15 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2018-10-13 00:50:53 -0400 |
| commit | f0193d3ea73b966b5dbfa272c8228d743b8856ef (patch) | |
| tree | c882a171c8706f274a7e09d8f7297c36ed750e34 /net/nfc | |
| parent | 7ee329655189f32f0c17e0bad60c23a69b003e9e (diff) | |
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 'net/nfc')
| -rw-r--r-- | net/nfc/nci/uart.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/nfc/nci/uart.c b/net/nfc/nci/uart.c index a66f102c6c01..d1fa0f22c10c 100644 --- a/net/nfc/nci/uart.c +++ b/net/nfc/nci/uart.c @@ -465,6 +465,7 @@ static struct tty_ldisc_ops nci_uart_ldisc = { .receive_buf = nci_uart_tty_receive, .write_wakeup = nci_uart_tty_wakeup, .ioctl = nci_uart_tty_ioctl, + .compat_ioctl = nci_uart_tty_ioctl, }; static int __init nci_uart_init(void) |