staging: vchiq_core: Remove stackhog in process_free_queue

This removes the stackhog in process_free_queue by allocating the
necessary memory within the recycle thread main function instead
of the stack.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
index 80f6168..cc5b72f 100644 (file)
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
@@ -620,10 +620,9 @@ reserve_space(VCHIQ_STATE_T *state, size_t space, int is_blocking)
 
 /* Called by the recycle thread. */
 static void
-process_free_queue(VCHIQ_STATE_T *state)
+process_free_queue(VCHIQ_STATE_T *state, BITSET_T *service_found, size_t length)
 {
        VCHIQ_SHARED_STATE_T *local = state->local;
-       BITSET_T service_found[BITSET_SIZE(VCHIQ_MAX_SERVICES)];
        int slot_queue_available;
 
        /* Find slots which have been freed by the other side, and return them
@@ -656,7 +655,7 @@ process_free_queue(VCHIQ_STATE_T *state)
 
                /* Initialise the bitmask for services which have used this
                ** slot */
-               BITSET_ZERO(service_found);
+               memset(service_found, 0, length);
 
                pos = 0;
 
@@ -2183,11 +2182,20 @@ recycle_func(void *v)
 {
        VCHIQ_STATE_T *state = (VCHIQ_STATE_T *) v;
        VCHIQ_SHARED_STATE_T *local = state->local;
+       BITSET_T *found;
+       size_t length;
+
+       length = sizeof(*found) * BITSET_SIZE(VCHIQ_MAX_SERVICES);
+
+       found = kmalloc_array(BITSET_SIZE(VCHIQ_MAX_SERVICES), sizeof(*found),
+                             GFP_KERNEL);
+       if (!found)
+               return -ENOMEM;
 
        while (1) {
                remote_event_wait(state, &local->recycle);
 
-               process_free_queue(state);
+               process_free_queue(state, found, length);
        }
        return 0;
 }