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[S390] sclp: clean up send/receive naming scheme

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Make state change events adjust the correct mask by cleaning up
naming inconsistencies. Also remove chance for lockup by removing
unnecessary mask related check before reading events.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Peter Oberparleiter 2008-02-19 15:29:32 +01:00 committed by Martin Schwidefsky
parent 06cb92ffe4
commit d082d3ce32
6 changed files with 15 additions and 13 deletions
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12
drivers/s390/char/sclp.c
View file

@ -29,10 +29,10 @@ static ext_int_info_t ext_int_info_hwc;
/* Lock to protect internal data consistency. */
static DEFINE_SPINLOCK(sclp_lock);
/* Mask of events that we can receive from the sclp interface. */
/* Mask of events that we can send to the sclp interface. */
static sccb_mask_t sclp_receive_mask;
/* Mask of events that we can send to the sclp interface. */
/* Mask of events that we can receive from the sclp interface. */
static sccb_mask_t sclp_send_mask;
/* List of registered event listeners and senders. */
@ -380,7 +380,7 @@ sclp_interrupt_handler(__u16 code)
}
sclp_running_state = sclp_running_state_idle;
}
if (evbuf_pending && sclp_receive_mask != 0 &&
if (evbuf_pending &&
sclp_activation_state == sclp_activation_state_active)
__sclp_queue_read_req();
spin_unlock(&sclp_lock);
@ -459,8 +459,8 @@ sclp_dispatch_state_change(void)
reg = NULL;
list_for_each(l, &sclp_reg_list) {
reg = list_entry(l, struct sclp_register, list);
receive_mask = reg->receive_mask & sclp_receive_mask;
send_mask = reg->send_mask & sclp_send_mask;
receive_mask = reg->send_mask & sclp_receive_mask;
send_mask = reg->receive_mask & sclp_send_mask;
if (reg->sclp_receive_mask != receive_mask ||
reg->sclp_send_mask != send_mask) {
reg->sclp_receive_mask = receive_mask;
@ -615,8 +615,8 @@ struct init_sccb {
u16 mask_length;
sccb_mask_t receive_mask;
sccb_mask_t send_mask;
sccb_mask_t sclp_send_mask;
sccb_mask_t sclp_receive_mask;
sccb_mask_t sclp_send_mask;
} __attribute__((packed));
/* Prepare init mask request. Called while sclp_lock is locked. */

6
drivers/s390/char/sclp.h
View file

@ -122,11 +122,13 @@ struct sclp_req {
/* of some routines it wants to be called from the low level driver */
struct sclp_register {
struct list_head list;
/* event masks this user is registered for */
/* User wants to receive: */
sccb_mask_t receive_mask;
/* User wants to send: */
sccb_mask_t send_mask;
/* actually present events */
/* H/W can receive: */
sccb_mask_t sclp_receive_mask;
/* H/W can send: */
sccb_mask_t sclp_send_mask;
/* called if event type availability changes */
void (*state_change_fn)(struct sclp_register *);

2
drivers/s390/char/sclp_config.c
View file

@ -64,7 +64,7 @@ static int __init sclp_conf_init(void)
return rc;
}
if (!(sclp_conf_register.sclp_receive_mask & EVTYP_CONFMGMDATA_MASK)) {
if (!(sclp_conf_register.sclp_send_mask & EVTYP_CONFMGMDATA_MASK)) {
printk(KERN_WARNING TAG "no configuration management.\n");
sclp_unregister(&sclp_conf_register);
rc = -ENOSYS;

2
drivers/s390/char/sclp_cpi_sys.c
View file

@ -129,7 +129,7 @@ static int cpi_req(void)
"to hardware console.\n");
goto out;
}
if (!(sclp_cpi_event.sclp_send_mask & EVTYP_CTLPROGIDENT_MASK)) {
if (!(sclp_cpi_event.sclp_receive_mask & EVTYP_CTLPROGIDENT_MASK)) {
printk(KERN_WARNING "cpi: no control program "
"identification support\n");
rc = -EOPNOTSUPP;

4
drivers/s390/char/sclp_rw.c
View file

@ -452,10 +452,10 @@ sclp_emit_buffer(struct sclp_buffer *buffer,
return -EIO;
sccb = buffer->sccb;
if (sclp_rw_event.sclp_send_mask & EVTYP_MSG_MASK)
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_send_mask & EVTYP_PMSGCMD_MASK)
else if (sclp_rw_event.sclp_receive_mask & EVTYP_PMSGCMD_MASK)
/* Use write priority message */
sccb->msg_buf.header.type = EVTYP_PMSGCMD;
else

2
drivers/s390/char/sclp_vt220.c
View file

@ -202,7 +202,7 @@ sclp_vt220_callback(struct sclp_req *request, void *data)
static int
__sclp_vt220_emit(struct sclp_vt220_request *request)
{
if (!(sclp_vt220_register.sclp_send_mask & EVTYP_VT220MSG_MASK)) {
if (!(sclp_vt220_register.sclp_receive_mask & EVTYP_VT220MSG_MASK)) {
request->sclp_req.status = SCLP_REQ_FAILED;
return -EIO;
}