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char: make some qemu_chr_fe skip if no driver

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In most cases, front ends do not care about the side effect of
CharBackend, so we can simply skip the checks and call the qemu_chr_fe
functions even without associated CharDriver.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20161022095318.17775-20-marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Marc-André Lureau 2016-10-22 12:52:59 +03:00 • committed by Paolo Bonzini
parent c39860e6dc
commit fa394ed625
22 changed files with 156 additions and 190 deletions
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26
hw/char/imx_serial.c
View file

@ -121,9 +121,7 @@ static uint64_t imx_serial_read(void *opaque, hwaddr offset,
s->usr2 &= ~USR2_RDR;
s->uts1 |= UTS1_RXEMPTY;
imx_update(s);
if (s->chr.chr) {
qemu_chr_fe_accept_input(&s->chr);
}
qemu_chr_fe_accept_input(&s->chr);
}
return c;
@ -182,11 +180,9 @@ static void imx_serial_write(void *opaque, hwaddr offset,
case 0x10: /* UTXD */
ch = value;
if (s->ucr2 & UCR2_TXEN) {
if (s->chr.chr) {
/* XXX this blocks entire thread. Rewrite to use
* qemu_chr_fe_write and background I/O callbacks */
qemu_chr_fe_write_all(&s->chr, &ch, 1);
}
/* XXX this blocks entire thread. Rewrite to use
* qemu_chr_fe_write and background I/O callbacks */
qemu_chr_fe_write_all(&s->chr, &ch, 1);
s->usr1 &= ~USR1_TRDY;
imx_update(s);
s->usr1 |= USR1_TRDY;
@ -215,9 +211,7 @@ static void imx_serial_write(void *opaque, hwaddr offset,
}
if (value & UCR2_RXEN) {
if (!(s->ucr2 & UCR2_RXEN)) {
if (s->chr.chr) {
qemu_chr_fe_accept_input(&s->chr);
}
qemu_chr_fe_accept_input(&s->chr);
}
}
s->ucr2 = value & 0xffff;
@ -319,12 +313,10 @@ static void imx_serial_realize(DeviceState *dev, Error **errp)
{
IMXSerialState *s = IMX_SERIAL(dev);
if (s->chr.chr) {
qemu_chr_fe_set_handlers(&s->chr, imx_can_receive, imx_receive,
imx_event, s, NULL);
} else {
DPRINTF("No char dev for uart\n");
}
DPRINTF("char dev for uart: %p\n", qemu_chr_fe_get_driver(&s->chr));
qemu_chr_fe_set_handlers(&s->chr, imx_can_receive, imx_receive,
imx_event, s, NULL);
}
static void imx_serial_init(Object *obj)