diff options
Diffstat (limited to 'sys/x86')
| -rw-r--r-- | sys/x86/x86/intr_machdep.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/sys/x86/x86/intr_machdep.c b/sys/x86/x86/intr_machdep.c index 9a5e463..cc50321 100644 --- a/sys/x86/x86/intr_machdep.c +++ b/sys/x86/x86/intr_machdep.c @@ -197,19 +197,28 @@ int intr_remove_handler(void *cookie) { struct intsrc *isrc; - int error; + int error, mtx_owned; isrc = intr_handler_source(cookie); error = intr_event_remove_handler(cookie); if (error == 0) { - mtx_lock(&intr_table_lock); + /* + * Recursion is needed here so PICs can remove interrupts + * while resuming. It was previously not possible due to + * intr_resume holding the intr_table_lock and + * intr_remove_handler recursing on it. + */ + mtx_owned = mtx_owned(&intr_table_lock); + if (mtx_owned == 0) + mtx_lock(&intr_table_lock); isrc->is_handlers--; if (isrc->is_handlers == 0) { isrc->is_pic->pic_disable_source(isrc, PIC_NO_EOI); isrc->is_pic->pic_disable_intr(isrc); } intrcnt_updatename(isrc); - mtx_unlock(&intr_table_lock); + if (mtx_owned == 0) + mtx_unlock(&intr_table_lock); } return (error); } |
