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

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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>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nicolas Boullis 2012-10-16 00:06:23 +02:00 committed by Greg Kroah-Hartman
parent 6e1babb3ff
commit 301a29da6e
1 changed files with 15 additions and 5 deletions
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20
drivers/usb/class/cdc-acm.c
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@ -817,10 +817,6 @@ 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)
{
@ -834,7 +830,21 @@ 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);