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serial: Open non-block 

On a real serial device, the open can block if the handshake
lines are in a particular state.  If a QEMU is passing the serial
device to the guest, the QEMU startup is blocked opening the device
(with a symptom seen as a timeout from libvirt).

Open the serial port with O_NONBLOCK.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2018-02-26 13:04:52 +00:00 committed by Paolo Bonzini
parent 66d26ddb23
commit 76b004d10d
1 changed files with 2 additions and 1 deletions
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3
chardev/char-serial.c
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@ -265,7 +265,8 @@ static void qmp_chardev_open_serial(Chardev *chr,
ChardevHostdev *serial = backend->u.serial.data;
int fd;
fd = qmp_chardev_open_file_source(serial->device, O_RDWR, errp);
fd = qmp_chardev_open_file_source(serial->device, O_RDWR | O_NONBLOCK,
errp);
if (fd < 0) {
return;
}