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char: Allow devices to use a single multiplexed chardev. 

This fixes regression caused by commit
2d6c1ef40f
("char: Prevent multiple devices opening same chardev"):

-nodefaults -nographic -chardev stdio,id=stdio,mux=on,signal=off \
 -mon stdio -device virtio-serial-pci \
 -device virtconsole,chardev=stdio -device isa-serial,chardev=stdio

fails with:

qemu-system-x86_64: -device isa-serial,chardev=stdio: Property 'isa-serial.chardev' can't take value 'stdio', it's in use

Signed-off-by: Kusanagi Kouichi <slash@ac.auone-net.jp>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
This commit is contained in:
Kusanagi Kouichi 2011-04-26 19:19:26 +09:00 committed by Amit Shah
parent cd8f7df289
commit d5b27167e1
3 changed files with 7 additions and 4 deletions
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4
hw/qdev-properties.c
View File

@ -354,10 +354,10 @@ static int parse_chr(DeviceState *dev, Property *prop, const char *str)
if (*ptr == NULL) { if (*ptr == NULL) {
return -ENOENT; return -ENOENT;
} }
if ((*ptr)->assigned) { if ((*ptr)->avail_connections < 1) {
return -EEXIST; return -EEXIST;
} }
(*ptr)->assigned = 1; --(*ptr)->avail_connections;
return 0; return 0;
} }

5
qemu-char.c
View File

@ -199,7 +199,7 @@ void qemu_chr_add_handlers(CharDriverState *s,
{ {
if (!opaque) { if (!opaque) {
/* chr driver being released. */ /* chr driver being released. */
s->assigned = 0; ++s->avail_connections;
} }
s->chr_can_read = fd_can_read; s->chr_can_read = fd_can_read;
s->chr_read = fd_read; s->chr_read = fd_read;
@ -2547,7 +2547,10 @@ CharDriverState *qemu_chr_open_opts(QemuOpts *opts,
snprintf(base->label, len, "%s-base", qemu_opts_id(opts)); snprintf(base->label, len, "%s-base", qemu_opts_id(opts));
chr = qemu_chr_open_mux(base); chr = qemu_chr_open_mux(base);
chr->filename = base->filename; chr->filename = base->filename;
chr->avail_connections = MAX_MUX;
QTAILQ_INSERT_TAIL(&chardevs, chr, next); QTAILQ_INSERT_TAIL(&chardevs, chr, next);
} else {
chr->avail_connections = 1;
} }
chr->label = qemu_strdup(qemu_opts_id(opts)); chr->label = qemu_strdup(qemu_opts_id(opts));
return chr; return chr;

2
qemu-char.h
View File

@ -72,7 +72,7 @@ struct CharDriverState {
char *label; char *label;
char *filename; char *filename;
int opened; int opened;
int assigned; /* chardev assigned to a device */ int avail_connections;
QTAILQ_ENTRY(CharDriverState) next; QTAILQ_ENTRY(CharDriverState) next;
}; };