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[PULL,5/5] s390x/sclpconsole: Avoid hanging SCLP ASCII console

Message ID 1415202496-27190-6-git-send-email-cornelia.huck@de.ibm.com
State New
Headers show

Commit Message

Cornelia Huck Nov. 5, 2014, 3:48 p.m. UTC 
From: Heinz Graalfs <graalfs@linux.vnet.ibm.com>

Force recalculation of file descriptor sets for main loop's poll(),
in order to be able to readd a possibly removed input file descriptor
after can_read() returned 0 (zero).

Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
---
 hw/char/sclpconsole.c |   12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)
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Patch

diff --git a/hw/char/sclpconsole.c b/hw/char/sclpconsole.c
index fca105d..79891df 100644
--- a/hw/char/sclpconsole.c
+++ b/hw/char/sclpconsole.c
@@ -36,6 +36,7 @@  typedef struct SCLPConsole {
     uint32_t iov_bs;        /* offset in buf for char layer read operation */
     uint32_t iov_data_len;  /* length of byte stream in buffer             */
     uint32_t iov_sclp_rest; /* length of byte stream not read via SCLP     */
+    bool notify;            /* qemu_notify_event() req'd if true           */
 } SCLPConsole;
 
 /* character layer call-back functions */
@@ -44,8 +45,12 @@  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) {
+        scon->notify = true;
+    }
+    return avail;
 }
 
 /* Send data from a char device over to the guest */
@@ -113,6 +118,10 @@  static void get_console_data(SCLPEvent *event, uint8_t *buf, size_t *size,
         cons->iov_sclp += avail;
         /* more data pending */
     }
+    if (cons->notify) {
+        cons->notify = false;
+        qemu_notify_event();
+    }
 }
 
 static int read_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr,
@@ -229,6 +238,7 @@  static void console_reset(DeviceState *dev)
    scon->iov_bs = 0;
    scon->iov_data_len = 0;
    scon->iov_sclp_rest = 0;
+   scon->notify = false;
 }
 
 static int console_exit(SCLPEvent *event)