linux-kernel - [PATCH 03/16] staging: fwserial: fix TIOCSSERIAL implementation

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Message-Id: <20210407102334.32361-4-johan@kernel.org>
Date:   Wed,  7 Apr 2021 12:23:21 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Jiri Slaby <jirislaby@...nel.org>, linux-staging@...ts.linux.dev,
        greybus-dev@...ts.linaro.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan@...nel.org>
Subject: [PATCH 03/16] staging: fwserial: fix TIOCSSERIAL implementation

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 fwserial implementation which was returning -EPERM also for a
privileged user when trying to change certain unsupported parameters,
and instead return success consistently.

Fixes: 7355ba3445f2 ("staging: fwserial: Add TTY-over-Firewire serial driver")
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/staging/fwserial/fwserial.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/staging/fwserial/fwserial.c b/drivers/staging/fwserial/fwserial.c
index 440d11423812..2888b80a2c1a 100644
--- a/drivers/staging/fwserial/fwserial.c
+++ b/drivers/staging/fwserial/fwserial.c
@@ -1234,10 +1234,6 @@ static int set_serial_info(struct tty_struct *tty,
 	struct fwtty_port *port = tty->driver_data;
 	unsigned int cdelay;

-	if (ss->irq != 0 || ss->port != 0 || ss->custom_divisor != 0 ||
-	    ss->baud_base != 400000000)
-		return -EPERM;
-
 	cdelay = msecs_to_jiffies(ss->close_delay * 10);

 	mutex_lock(&port->port.mutex);
-- 
2.26.3