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Subject[PATCH 08/31] 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>
---
drivers/isdn/capi/kcapi.c | 95 +++++++++++++++++++++++---------------------
1 files changed, 50 insertions(+), 45 deletions(-)
diff --git a/drivers/isdn/capi/kcapi.c b/drivers/isdn/capi/kcapi.c
index 476239f..3fcc95b 100644
--- a/drivers/isdn/capi/kcapi.c
+++ b/drivers/isdn/capi/kcapi.c
@@ -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 %dn", 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 %dn", __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 %dn", 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 %dn", contr);
+
+ ctr = get_capi_ctr_by_nr(contr);
+ if (ctr)
+ ctr_down(ctr);
+ else
+ printk(KERN_WARNING "%s: invalid contr %dn", __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);
@@ -517,8 +523,7 @@ 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--;

--
1.6.0.2


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