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[Qemu-devel] [PATCH 1/1] serial: Open non-block
From: |
Dr. David Alan Gilbert (git) |
Subject: |
[Qemu-devel] [PATCH 1/1] serial: Open non-block |
Date: |
Mon, 26 Feb 2018 13:04:52 +0000 |
From: "Dr. David Alan Gilbert" <address@hidden>
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 <address@hidden>
---
chardev/char-serial.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/chardev/char-serial.c b/chardev/char-serial.c
index feb52e559d..97be5d4a63 100644
--- a/chardev/char-serial.c
+++ b/chardev/char-serial.c
@@ -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;
}
--
2.14.3
- [Qemu-devel] [PATCH 1/1] serial: Open non-block,
Dr. David Alan Gilbert (git) <=