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CAPI: Rework capi_ctr_ready/down 

This step prepares the application of proper controller locking: Push
all state changing work into the notify handler that are called by
capi_ctr_ready and capi_ctr_down, switch detach_capi_ctr to issue a
synchronous ctr_down. Also ensure that we do not go through any action
if the state did not change.

Signed-off-by: Jan Kiszka <jan.kiszka@web.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jan Kiszka 2010-02-08 10:12:12 +00:00 committed by David S. Miller
parent 9717fb8b64
commit 3efecf7a49
1 changed files with 50 additions and 45 deletions
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95
drivers/isdn/capi/kcapi.c
View File

@ -169,44 +169,74 @@ static void release_appl(struct capi_ctr *ctr, u16 applid)
static void notify_up(u32 contr)
{
struct capi_ctr *ctr = get_capi_ctr_by_nr(contr);
struct capi20_appl *ap;
struct capi_ctr *ctr;
u16 applid;
if (showcapimsgs & 1) {
if (showcapimsgs & 1)
printk(KERN_DEBUG "kcapi: notify up contr %d\n", contr);
}
if (!ctr) {
ctr = get_capi_ctr_by_nr(contr);
if (ctr) {
if (ctr->state == CAPI_CTR_RUNNING)
return;
ctr->state = CAPI_CTR_RUNNING;
for (applid = 1; applid <= CAPI_MAXAPPL; applid++) {
ap = get_capi_appl_by_nr(applid);
if (!ap || ap->release_in_progress)
continue;
register_appl(ctr, applid, &ap->rparam);
if (ap->callback && !ap->release_in_progress)
ap->callback(KCI_CONTRUP, contr,
&ctr->profile);
}
} else
printk(KERN_WARNING "%s: invalid contr %d\n", __func__, contr);
return;
}
for (applid = 1; applid <= CAPI_MAXAPPL; applid++) {
ap = get_capi_appl_by_nr(applid);
if (!ap || ap->release_in_progress) continue;
register_appl(ctr, applid, &ap->rparam);
if (ap->callback && !ap->release_in_progress)
ap->callback(KCI_CONTRUP, contr, &ctr->profile);
}
}
/* -------- KCI_CONTRDOWN ------------------------------------- */
static void notify_down(u32 contr)
static void ctr_down(struct capi_ctr *ctr)
{
struct capi20_appl *ap;
u16 applid;
if (showcapimsgs & 1) {
printk(KERN_DEBUG "kcapi: notify down contr %d\n", contr);
}
if (ctr->state == CAPI_CTR_DETECTED)
return;
ctr->state = CAPI_CTR_DETECTED;
memset(ctr->manu, 0, sizeof(ctr->manu));
memset(&ctr->version, 0, sizeof(ctr->version));
memset(&ctr->profile, 0, sizeof(ctr->profile));
memset(ctr->serial, 0, sizeof(ctr->serial));
for (applid = 1; applid <= CAPI_MAXAPPL; applid++) {
ap = get_capi_appl_by_nr(applid);
if (ap && ap->callback && !ap->release_in_progress)
ap->callback(KCI_CONTRDOWN, contr, NULL);
if (ap && !ap->release_in_progress) {
if (ap->callback)
ap->callback(KCI_CONTRDOWN, ctr->cnr, NULL);
capi_ctr_put(ctr);
}
}
}
static void notify_down(u32 contr)
{
struct capi_ctr *ctr;
if (showcapimsgs & 1)
printk(KERN_DEBUG "kcapi: notify down contr %d\n", contr);
ctr = get_capi_ctr_by_nr(contr);
if (ctr)
ctr_down(ctr);
else
printk(KERN_WARNING "%s: invalid contr %d\n", __func__, contr);
}
static void notify_handler(struct work_struct *work)
{
struct capi_notifier *np =
@ -368,8 +398,6 @@ EXPORT_SYMBOL(capi_ctr_handle_message);
void capi_ctr_ready(struct capi_ctr *ctr)
{
ctr->state = CAPI_CTR_RUNNING;
printk(KERN_NOTICE "kcapi: controller [%03d] \"%s\" ready.\n",
ctr->cnr, ctr->name);
@ -388,28 +416,6 @@ EXPORT_SYMBOL(capi_ctr_ready);
void capi_ctr_down(struct capi_ctr *ctr)
{
u16 appl;
DBG("");
if (ctr->state == CAPI_CTR_DETECTED)
return;
ctr->state = CAPI_CTR_DETECTED;
memset(ctr->manu, 0, sizeof(ctr->manu));
memset(&ctr->version, 0, sizeof(ctr->version));
memset(&ctr->profile, 0, sizeof(ctr->profile));
memset(ctr->serial, 0, sizeof(ctr->serial));
for (appl = 1; appl <= CAPI_MAXAPPL; appl++) {
struct capi20_appl *ap = get_capi_appl_by_nr(appl);
if (!ap || ap->release_in_progress)
continue;
capi_ctr_put(ctr);
}
printk(KERN_NOTICE "kcapi: controller [%03d] down.\n", ctr->cnr);
notify_push(KCI_CONTRDOWN, ctr->cnr, 0, 0);
@ -513,8 +519,7 @@ EXPORT_SYMBOL(attach_capi_ctr);
int detach_capi_ctr(struct capi_ctr *ctr)
{
if (ctr->state != CAPI_CTR_DETECTED)
capi_ctr_down(ctr);
ctr_down(ctr);
ncontrollers--;