diff options
| -rw-r--r-- | firmware/buflib.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/firmware/buflib.c b/firmware/buflib.c index 3b4f522..d82acd7 100644 --- a/firmware/buflib.c +++ b/firmware/buflib.c @@ -206,16 +206,26 @@ move_block(struct buflib_context* ctx, union buflib_data* block, int shift) handle, shift, shift*sizeof(union buflib_data)); new_block = block + shift; new_start = tmp->alloc + shift*sizeof(union buflib_data); + + /* disable IRQs to make accessing the buffer from interrupt context safe. */ + /* protect the move callback, as a cached global pointer might be updated + * in it. and protect "tmp->alloc = new_start" for buflib_get_data() */ + disable_irq(); /* call the callback before moving */ if (ops) { if (ops->move_callback(handle, tmp->alloc, new_start) == BUFLIB_CB_CANNOT_MOVE) + { + enable_irq(); return false; + } } + tmp->alloc = new_start; /* update handle table */ memmove(new_block, block, block->val * sizeof(union buflib_data)); + enable_irq(); return true; } |