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s390/sclp: reduce dependency on event type masks 

The event type masks can change asynchronously. These changes are reported
by SCLP to the OS by state-change events which are retrieved with the read
event data command. The SCLP driver has a request queue, there is a window
where the read event data request has not completed yet but the SCLP console
drivers are trying to queue output requests. As the masks are not updated
yet the requests are discarded.

The simplest fix is to queue the console requests independent of the
event type masks and rely on SCLP to return with an error code if a
specific event type is not available.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2014-09-09 12:53:12 +02:00
parent 170387a887
commit ea61a579ab
3 changed files with 5 additions and 14 deletions
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2
drivers/s390/char/sclp_early.c
View File

@ -281,7 +281,7 @@ out:
static unsigned int __init sclp_con_check_linemode(struct init_sccb *sccb)
{
if (!(sccb->sclp_send_mask & (EVTYP_OPCMD_MASK | EVTYP_PMSGCMD_MASK)))
if (!(sccb->sclp_send_mask & EVTYP_OPCMD_MASK))
return 0;
if (!(sccb->sclp_receive_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK)))
return 0;

13
drivers/s390/char/sclp_rw.c
View File

@ -33,7 +33,7 @@ static void sclp_rw_pm_event(struct sclp_register *reg,
/* Event type structure for write message and write priority message */
static struct sclp_register sclp_rw_event = {
.send_mask = EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK,
.send_mask = EVTYP_MSG_MASK,
.pm_event_fn = sclp_rw_pm_event,
};
@ -456,14 +456,9 @@ sclp_emit_buffer(struct sclp_buffer *buffer,
return -EIO;
sccb = buffer->sccb;
if (sclp_rw_event.sclp_receive_mask & EVTYP_MSG_MASK)
/* Use normal write message */
sccb->msg_buf.header.type = EVTYP_MSG;
else if (sclp_rw_event.sclp_receive_mask & EVTYP_PMSGCMD_MASK)
/* Use write priority message */
sccb->msg_buf.header.type = EVTYP_PMSGCMD;
else
return -EOPNOTSUPP;
/* Use normal write message */
sccb->msg_buf.header.type = EVTYP_MSG;
buffer->request.command = SCLP_CMDW_WRITE_EVENT_DATA;
buffer->request.status = SCLP_REQ_FILLED;
buffer->request.callback = sclp_writedata_callback;

4
drivers/s390/char/sclp_vt220.c
View File

@ -206,10 +206,6 @@ sclp_vt220_callback(struct sclp_req *request, void *data)
static int
__sclp_vt220_emit(struct sclp_vt220_request *request)
{
if (!(sclp_vt220_register.sclp_receive_mask & EVTYP_VT220MSG_MASK)) {
request->sclp_req.status = SCLP_REQ_FAILED;
return -EIO;
}
request->sclp_req.command = SCLP_CMDW_WRITE_EVENT_DATA;
request->sclp_req.status = SCLP_REQ_FILLED;
request->sclp_req.callback = sclp_vt220_callback;