diff options
Diffstat (limited to 'kernel/gsp_sema_service.c')
| -rw-r--r-- | kernel/gsp_sema_service.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/kernel/gsp_sema_service.c b/kernel/gsp_sema_service.c index 020023a..ba26b3d 100644 --- a/kernel/gsp_sema_service.c +++ b/kernel/gsp_sema_service.c @@ -3486,9 +3486,14 @@ static void svc_handle_map_add(void) if (!ch->valid || !ch->gpfifo_entries) continue; + /* + * Clamp the rewind at 0: wrapping below zero (get=0 -> entries + * - N) makes the pump read ring slots past the producer that + * hold stale entries, so replay only recently consumed slots + * or from the start of the ring, never around the wrap. + */ get = ch->last_get; - ch->last_get = (get >= SVC_PIN_REWIND) ? get - SVC_PIN_REWIND : - ch->gpfifo_entries - (SVC_PIN_REWIND - get); + ch->last_get = (get >= SVC_PIN_REWIND) ? get - SVC_PIN_REWIND : 0; } spin_unlock_irqrestore(&svc.chan_lock, flags); |