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staging: greybus: uart: fix unprivileged TIOCCSERIAL 

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: e68453ed28 ("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>
This commit is contained in:
Johan Hovold 2021-04-07 12:23:24 +02:00 committed by Greg Kroah-Hartman
parent b71e571ada
commit 60c6b305c1
1 changed files with 0 additions and 2 deletions
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2
drivers/staging/greybus/uart.c
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@ -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;