usb: acm: fix the computation of the number of data bits

commit 301a29da6e891e7eb95c843af0ecdbe86d01f723 upstream.

The current code assumes that CSIZE is 0000060, which appears to be
wrong on some arches (such as powerpc).

Signed-off-by: Nicolas Boullis <nboullis@debian.org>
Acked-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 3b70aade056946ad48481b50acd2a78539b59e20..c5f7eae429e8b527006354188bf86beeb8353302 100644 (file)
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -818,10 +818,6 @@ static const __u32 acm_tty_speed[] = {
        2500000, 3000000, 3500000, 4000000
 };
 
-static const __u8 acm_tty_size[] = {
-       5, 6, 7, 8
-};
-
 static void acm_tty_set_termios(struct tty_struct *tty,
                                                struct ktermios *termios_old)
 {
@@ -835,7 +831,21 @@ static void acm_tty_set_termios(struct tty_struct *tty,
        newline.bParityType = termios->c_cflag & PARENB ?
                                (termios->c_cflag & PARODD ? 1 : 2) +
                                (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
-       newline.bDataBits = acm_tty_size[(termios->c_cflag & CSIZE) >> 4];
+       switch (termios->c_cflag & CSIZE) {
+       case CS5:
+               newline.bDataBits = 5;
+               break;
+       case CS6:
+               newline.bDataBits = 6;
+               break;
+       case CS7:
+               newline.bDataBits = 7;
+               break;
+       case CS8:
+       default:
+               newline.bDataBits = 8;
+               break;
+       }
        /* FIXME: Needs to clear unsupported bits in the termios */
        acm->clocal = ((termios->c_cflag & CLOCAL) != 0);