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s390/sclpconsole: prevent char layer callback during initialization

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Starting a qemu with an sclp console and pressing a key very early
can result in
"qemu-system-s390x: hw/s390x/sclpconsole.c:60: receive_from_chr_layer:
Assertion `scon->iov' failed."

Lets make sure that the init process is finished, since the iov is
allocated after CHR_EVENT_OPENED by also checking for scon->iov.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Christian Borntraeger 2013-02-04 22:53:24 +00:00 committed by Anthony Liguori
parent 7ce4106c21
commit 760794f784
1 changed files with 1 additions and 4 deletions
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5
hw/s390x/sclpconsole.c
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@ -44,12 +44,9 @@ typedef struct SCLPConsole {
/* Return number of bytes that fit into iov buffer */
static int chr_can_read(void *opaque)
{
int can_read;
SCLPConsole *scon = opaque;
can_read = SIZE_BUFFER_VT220 - scon->iov_data_len;
return can_read;
return scon->iov ? SIZE_BUFFER_VT220 - scon->iov_data_len : 0;
}
/* Receive n bytes from character layer, save in iov buffer,