diff options
| author | Ian Campbell <ian.campbell@citrix.com> | 2013-08-22 17:01:59 +0100 |
|---|---|---|
| committer | Ian Campbell <ian.campbell@citrix.com> | 2013-08-27 14:35:44 +0100 |
| commit | 2050ad703c65ed997f1328af702054d1960fb168 (patch) | |
| tree | ecd146974f5ded6a323422dc9e1536586be4e107 /xen/drivers | |
| parent | ceb93c72d2046bffecd57fcbebd04aa0801414a2 (diff) | |
| download | xen-2050ad703c65ed997f1328af702054d1960fb168.tar.gz xen-2050ad703c65ed997f1328af702054d1960fb168.tar.bz2 xen-2050ad703c65ed997f1328af702054d1960fb168.zip | |
pl011: early_panic if baud rate not set in hardware
Now that the driver defaults to BAUD_AUTO this can happen if the early uart !=
console or if early printk isn't in use.
The following division by zero causes a trap but that uses regular printk and
not early_printk, so it is never seen.
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Julien Grall <julien.grall@linaro.org>
Diffstat (limited to 'xen/drivers')
| -rw-r--r-- | xen/drivers/char/pl011.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/xen/drivers/char/pl011.c b/xen/drivers/char/pl011.c index e4bd702f3f..3ea0d41f8c 100644 --- a/xen/drivers/char/pl011.c +++ b/xen/drivers/char/pl011.c @@ -104,6 +104,8 @@ static void __init pl011_init_preirq(struct serial_port *port) { /* Baud rate already set: read it out from the divisor latch. */ divisor = (pl011_read(uart, IBRD) << 6) | (pl011_read(uart, FBRD)); + if (!divisor) + early_panic("pl011: No Baud rate configured\n"); uart->baud = (uart->clock_hz << 2) / divisor; } /* This write must follow FBRD and IBRD writes. */ |