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i.MX: Fix UART driver to work with unitialized "chardev" device

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The "chardev" property initialization might have failed (for example because
there are not enough chardevs provided by QEMU).

The serial device emulator needs to be able to work with an uninitialized
(NULL) chardev device pointer.

This patch adds some missing tests on the chr pointer value before
using it.

Signed-off-by: Jean-Christophe Dubois <jcd@tribudubois.net>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: 1438342461-18967-1-git-send-email-jcd@tribudubois.net
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Jean-Christophe Dubois 2015-08-13 11:26:22 +01:00 committed by Peter Maydell
parent 5dfaa75b4d
commit f7a6785e12
1 changed files with 6 additions and 2 deletions
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4
hw/char/imx_serial.c
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@ -125,8 +125,10 @@ static uint64_t imx_serial_read(void *opaque, hwaddr offset,
s->usr2 &= ~USR2_RDR;
s->uts1 |= UTS1_RXEMPTY;
imx_update(s);
if (s->chr) {
qemu_chr_accept_input(s->chr);
}
}
return c;
case 0x20: /* UCR1 */
@ -212,9 +214,11 @@ static void imx_serial_write(void *opaque, hwaddr offset,
}
if (value & UCR2_RXEN) {
if (!(s->ucr2 & UCR2_RXEN)) {
if (s->chr) {
qemu_chr_accept_input(s->chr);
}
}
}
s->ucr2 = value & 0xffff;
break;