mg/qmk_sweep_skeletyl
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

ChibiOS USB driver: prevent deadlock with CONSOLE_ENABLE = yes (#12472)

Browse source 
Before this commit, attaching an ARM-based (i.e. ChibiOS-based) keyboard that
uses CONSOLE_ENABLE = yes and produces debug messages would deadlock the
keyboard unless one was running hid_listen.

With this commit, dead-locking writes to the queue are detected and prevented.

fixes #5631
This commit is contained in:
Michael Stapelberg 2021-04-10 17:03:38 +02:00 committed by GitHub
parent 03685309fd
commit 7d953332e0
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 13 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
tmk_core/protocol/chibios/usb_driver.c
View file

@ -80,7 +80,19 @@ static bool qmkusb_start_receive(QMKUSBDriver *qmkusbp) {
* Interface implementation.
*/
static size_t _write(void *ip, const uint8_t *bp, size_t n) { return obqWriteTimeout(&((QMKUSBDriver *)ip)->obqueue, bp, n, TIME_INFINITE); }
static size_t _write(void *ip, const uint8_t *bp, size_t n) {
output_buffers_queue_t *obqueue = &((QMKUSBDriver *)ip)->obqueue;
chSysLock();
const bool full = obqIsFullI(obqueue);
chSysUnlock();
if (full || bqIsSuspendedX(obqueue)) {
/* Discard any writes while the queue is suspended or full, i.e. the hidraw
interface is not open. If we tried to send with an infinite timeout, we
would deadlock the keyboard otherwise. */
return -1;
}
return obqWriteTimeout(obqueue, bp, n, TIME_INFINITE);
}
static size_t _read(void *ip, uint8_t *bp, size_t n) { return ibqReadTimeout(&((QMKUSBDriver *)ip)->ibqueue, bp, n, TIME_INFINITE); }