From 61a9346f60fe32143c007bb27bac6e1d83e4aee8 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Tue, 11 Sep 2018 15:16:58 +0200 Subject: [PATCH] serial: fix DLL writes Commit 0147883450fe84bb8de2d4a58381881f4262ce9b tries to handle word-sized writes to DLL/DLH, but due to a typo, this patch is causing tracebacks in all Linux kernels running the PXA serial driver, due to an unexpected DLL register value. Here is the surrounding code from drivers/tty/serial/pxa.c: serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */ /* * work around Errata #75 according to Intel(R) PXA27x * Processor Family Specification Update (Nov 2005) */ dll = serial_in(up, UART_DLL); WARN_ON(dll != (quot & 0xff)); // <-- warning Reported-by: Guenter Roeck Tested-by: Guenter Roeck Fixes: 0147883450fe84bb8de2d4a58381881f4262ce9b Signed-off-by: Paolo Bonzini --- hw/char/serial.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/hw/char/serial.c b/hw/char/serial.c index 251f40fdac..02463e3388 100644 --- a/hw/char/serial.c +++ b/hw/char/serial.c @@ -345,9 +345,9 @@ static void serial_ioport_write(void *opaque, hwaddr addr, uint64_t val, default: case 0: if (s->lcr & UART_LCR_DLAB) { - if (size == 2) { + if (size == 1) { s->divider = (s->divider & 0xff00) | val; - } else if (size == 4) { + } else { s->divider = val; } serial_update_parameters(s);