scottk/OpenCellular
1
0
Fork 0
mirror of https://github.com/Telecominfraproject/OpenCellular.git synced 2026-01-12 19:04:59 +00:00
Code Issues Packages Projects Releases Wiki Activity

ensure the re-scheduling is not interrupted

Browse Source 
The re-scheduling is protected by increasing our priority to -1,
according to ARMv-M architecture manual, we need an ISB after setting
the faultmask register to ensure that the new priority is visible.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BUG=chrome-os-partner:8492
TEST=run on proto-0.5 and see that the temperature sensor and battery
tasks are longer hanging (see the bug for details how to check it)

Change-Id: Ia55859cf5c9101a09c61be7647a920126fc0a3b9
This commit is contained in:
Vincent Palatin
2012-03-14 22:23:52 +00:00
parent ce60b937cb
commit 0cde4cfec3
1 changed files with 2 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
core/cortex-m/task.c
View File

@@ -164,12 +164,11 @@ uint32_t *task_get_event_bitmap(task_id_t tskid)
void svc_handler(int desched, task_id_t resched)
{
task_ *current, *next;
uint32_t reg;
/* push the priority to -1 until the return, to avoid being
* interrupted */
asm volatile("mov %0, #1\n"
"msr faultmask, %0" :"=r"(reg));
asm volatile("cpsid f\n"
"isb\n");
current = __get_task_scheduled();
if (desched && !current->events) {
/* Remove our own ready bit */