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background callbacks: Clear any callbacks that were queued 

Before this, a background callback that was on the list when
background_callback_reset was called could have ended up in a state
that made it "un-queueable": its "prev" pointer could have been non-NULL.
This commit is contained in:
Jeff Epler 2020-07-20 08:44:39 -05:00
parent 8f928340c6
commit db43c56f79
1 changed files with 8 additions and 0 deletions
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8
supervisor/shared/background_callback.c
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@ -24,6 +24,8 @@
* THE SOFTWARE.
*/
#include <string.h>
#include "py/gc.h"
#include "py/mpconfig.h"
#include "supervisor/background_callback.h"
@ -101,6 +103,12 @@ void background_callback_end_critical_section() {
void background_callback_reset() {
CALLBACK_CRITICAL_BEGIN;
background_callback_t *cb = (background_callback_t*)callback_head;
while(cb) {
background_callback_t *next = cb->next;
memset(cb, 0, sizeof(*cb));
cb = next;
}
callback_head = NULL;
callback_tail = NULL;
in_background_callback = false;