diff options
Diffstat (limited to 'sys/kern/kern_intr.c')
-rw-r--r-- | sys/kern/kern_intr.c | 59 |
1 files changed, 57 insertions, 2 deletions
diff --git a/sys/kern/kern_intr.c b/sys/kern/kern_intr.c index 3eb2c6ca3f88..42d5f167bd42 100644 --- a/sys/kern/kern_intr.c +++ b/sys/kern/kern_intr.c @@ -524,7 +524,7 @@ intr_event_add_handler(struct intr_event *ie, const char *name, ih->ih_filter = filter; ih->ih_handler = handler; ih->ih_argument = arg; - ih->ih_name = name; + strlcpy(ih->ih_name, name, sizeof(ih->ih_name)); ih->ih_event = ie; ih->ih_pri = pri; if (flags & INTR_EXCL) @@ -597,7 +597,7 @@ intr_event_add_handler(struct intr_event *ie, const char *name, ih->ih_filter = filter; ih->ih_handler = handler; ih->ih_argument = arg; - ih->ih_name = name; + strlcpy(ih->ih_name, name, sizeof(ih->ih_name)); ih->ih_event = ie; ih->ih_pri = pri; if (flags & INTR_EXCL) @@ -665,6 +665,61 @@ intr_event_add_handler(struct intr_event *ie, const char *name, #endif /* + * Append a description preceded by a ':' to the name of the specified + * interrupt handler. + */ +int +intr_event_describe_handler(struct intr_event *ie, void *cookie, + const char *descr) +{ + struct intr_handler *ih; + size_t space; + char *start; + + mtx_lock(&ie->ie_lock); +#ifdef INVARIANTS + TAILQ_FOREACH(ih, &ie->ie_handlers, ih_next) { + if (ih == cookie) + break; + } + if (ih == NULL) { + mtx_unlock(&ie->ie_lock); + panic("handler %p not find in interrupt event %p", cookie, ie); + } +#endif + ih = cookie; + + /* + * Look for an existing description by checking for an + * existing ":". This assumes device names do not include + * colons. If one is found, prepare to insert the new + * description at that point. If one is not found, find the + * end of the name to use as the insertion point. + */ + start = index(ih->ih_name, ':'); + if (start == NULL) + start = index(ih->ih_name, 0); + + /* + * See if there is enough remaining room in the string for the + * description + ":". The "- 1" leaves room for the trailing + * '\0'. The "+ 1" accounts for the colon. + */ + space = sizeof(ih->ih_name) - (start - ih->ih_name) - 1; + if (strlen(descr) + 1 > space) { + mtx_unlock(&ie->ie_lock); + return (ENOSPC); + } + + /* Append a colon followed by the description. */ + *start = ':'; + strcpy(start + 1, descr); + intr_event_update(ie); + mtx_unlock(&ie->ie_lock); + return (0); +} + +/* * Return the ie_source field from the intr_event an intr_handler is * associated with. */ |