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USB: serial: ftdi_sio: clean up receive processing

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[ Upstream commit ce054039ba5e47b75a3be02a00274e52b06a6456 ]

Clean up receive processing by dropping the character pointer and
keeping the length argument unchanged throughout the function.

Also make it more apparent that sysrq processing can consume a
characters by adding an explicit continue.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Johan Hovold 2020-07-08 14:49:52 +02:00 committed by Greg Kroah-Hartman
parent aeefe7d15c
commit 9705f53eb0
1 changed files with 9 additions and 10 deletions
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19
drivers/usb/serial/ftdi_sio.c
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@ -2483,7 +2483,6 @@ static int ftdi_process_packet(struct usb_serial_port *port,
struct ftdi_private *priv, unsigned char *buf, int len)
{
unsigned char status;
unsigned char *ch;
int i;
char flag;
@ -2526,8 +2525,7 @@ static int ftdi_process_packet(struct usb_serial_port *port,
else
priv->transmit_empty = 0;
len -= 2;
if (!len)
if (len == 2)
return 0; /* status only */
/*
@ -2556,19 +2554,20 @@ static int ftdi_process_packet(struct usb_serial_port *port,
}
}
port->icount.rx += len;
ch = buf + 2;
port->icount.rx += len - 2;
if (port->port.console && port->sysrq) {
for (i = 0; i < len; i++, ch++) {
if (!usb_serial_handle_sysrq_char(port, *ch))
tty_insert_flip_char(&port->port, *ch, flag);
for (i = 2; i < len; i++) {
if (usb_serial_handle_sysrq_char(port, buf[i]))
continue;
tty_insert_flip_char(&port->port, buf[i], flag);
}
} else {
tty_insert_flip_string_fixed_flag(&port->port, ch, flag, len);
tty_insert_flip_string_fixed_flag(&port->port, buf + 2, flag,
len - 2);
}
return len;
return len - 2;
}
static void ftdi_process_read_urb(struct urb *urb)