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| author | Johan Hovold <johan@kernel.org> | 2021-04-07 13:23:24 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-14 11:52:27 +0300 |
| commit | 9acb52e70c182c0ff1355c63de60b20e6e750348 (patch) | |
| tree | 6480d696d36bebc0763a73e26808dccbc3fa1da6 | |
| parent | 15ee91744b237129623afb798d9b9a585c06daa4 (diff) | |
| download | linux-9acb52e70c182c0ff1355c63de60b20e6e750348.tar.xz | |
staging: greybus: uart: fix unprivileged TIOCCSERIAL
[ Upstream commit 60c6b305c11b5fd167ce5e2ce42f3a9098c388f0 ]
TIOCSSERIAL is a horrid, underspecified, legacy interface which for most
serial devices is only useful for setting the close_delay and
closing_wait parameters.
A non-privileged user has only ever been able to set the since long
deprecated ASYNC_SPD flags and trying to change any other *supported*
feature should result in -EPERM being returned. Setting the current
values for any supported features should return success.
Fix the greybus implementation which instead indicated that the
TIOCSSERIAL ioctl was not even implemented when a non-privileged user
set the current values.
Fixes: e68453ed28c5 ("greybus: uart-gb: now builds, more framework added")
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210407102334.32361-7-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/staging/greybus/uart.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/staging/greybus/uart.c b/drivers/staging/greybus/uart.c index 29846dc1e1bf..a520f7f213db 100644 --- a/drivers/staging/greybus/uart.c +++ b/drivers/staging/greybus/uart.c @@ -641,8 +641,6 @@ static int set_serial_info(struct tty_struct *tty, if ((close_delay != gb_tty->port.close_delay) || (closing_wait != gb_tty->port.closing_wait)) retval = -EPERM; - else - retval = -EOPNOTSUPP; } else { gb_tty->port.close_delay = close_delay; gb_tty->port.closing_wait = closing_wait; |