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[Qemu-devel] [RFC 3/3] s390x: Avoid hanging SCLP ASCII console
From: |
Heinz Graalfs |
Subject: |
[Qemu-devel] [RFC 3/3] s390x: Avoid hanging SCLP ASCII console |
Date: |
Fri, 24 Oct 2014 10:13:47 +0200 |
Exploit the new can_read timeout infrastructure in order to avoid
hangs when no further activity happens on the main thread.
Signed-off-by: Heinz Graalfs <address@hidden>
---
hw/char/sclpconsole.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/hw/char/sclpconsole.c b/hw/char/sclpconsole.c
index fca105d..a33aaa2 100644
--- a/hw/char/sclpconsole.c
+++ b/hw/char/sclpconsole.c
@@ -44,8 +44,13 @@ typedef struct SCLPConsole {
static int chr_can_read(void *opaque)
{
SCLPConsole *scon = opaque;
+ int avail = SIZE_BUFFER_VT220 - scon->iov_data_len;
- return SIZE_BUFFER_VT220 - scon->iov_data_len;
+ if (avail > 0) {
+ return avail;
+ }
+
+ return -EAGAIN;
}
/* Send data from a char device over to the guest */
--
1.8.3.1