On 5/11/2023 9:18 PM, Dan Carpenter wrote:
Hi Elson,
kernel test robot noticed the following build warnings:
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Elson-Roy-Serrao/usb-function-u_ether-Handle-rx-requests-during-suspend-resume/20230512-015036
base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
patch link: https://lore.kernel.org/r/1683827311-1462-3-git-send-email-quic_eserrao%40quicinc.com
patch subject: [PATCH 2/2] usb: dwc3: Modify runtime pm ops to handle bus suspend
config: x86_64-randconfig-m001 (https://download.01.org/0day-ci/archive/20230512/202305120709.tCFYCtsd-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Reported-by: Dan Carpenter <error27@xxxxxxxxx>
| Link: https://lore.kernel.org/r/202305120709.tCFYCtsd-lkp@xxxxxxxxx/
New smatch warnings:
drivers/usb/dwc3/gadget.c:2409 dwc3_gadget_wakeup() warn: pm_runtime_get_sync() also returns 1 on success
drivers/usb/dwc3/gadget.c:2437 dwc3_gadget_func_wakeup() warn: pm_runtime_get_sync() also returns 1 on success
Old smatch warnings:
drivers/usb/dwc3/gadget.c:1648 __dwc3_gadget_kick_transfer() warn: missing error code? 'ret'
drivers/usb/dwc3/gadget.c:2744 dwc3_gadget_pullup() warn: pm_runtime_get_sync() also returns 1 on success
vim +2409 drivers/usb/dwc3/gadget.c
218ef7b647e336 Felipe Balbi 2016-04-04 2392 static int dwc3_gadget_wakeup(struct usb_gadget *g)
218ef7b647e336 Felipe Balbi 2016-04-04 2393 {
218ef7b647e336 Felipe Balbi 2016-04-04 2394 struct dwc3 *dwc = gadget_to_dwc(g);
218ef7b647e336 Felipe Balbi 2016-04-04 2395 unsigned long flags;
218ef7b647e336 Felipe Balbi 2016-04-04 2396 int ret;
218ef7b647e336 Felipe Balbi 2016-04-04 2397
047161686b813a Elson Roy Serrao 2023-03-24 2398 if (!dwc->wakeup_configured) {
047161686b813a Elson Roy Serrao 2023-03-24 2399 dev_err(dwc->dev, "remote wakeup not configured\n");
047161686b813a Elson Roy Serrao 2023-03-24 2400 return -EINVAL;
047161686b813a Elson Roy Serrao 2023-03-24 2401 }
047161686b813a Elson Roy Serrao 2023-03-24 2402
047161686b813a Elson Roy Serrao 2023-03-24 2403 if (!dwc->gadget->wakeup_armed) {
047161686b813a Elson Roy Serrao 2023-03-24 2404 dev_err(dwc->dev, "not armed for remote wakeup\n");
047161686b813a Elson Roy Serrao 2023-03-24 2405 return -EINVAL;
047161686b813a Elson Roy Serrao 2023-03-24 2406 }
047161686b813a Elson Roy Serrao 2023-03-24 2407
0660b8a88d4d6a Elson Roy Serrao 2023-05-11 2408 ret = pm_runtime_get_sync(dwc->dev);
0660b8a88d4d6a Elson Roy Serrao 2023-05-11 @2409 if (ret) {
The checker is correct. These days it's better to use the
pm_runtime_resume_and_get() function instead of pm_runtime_get_sync().
Sure.Thanks!
0660b8a88d4d6a Elson Roy Serrao 2023-05-11 2410 pm_runtime_put(dwc->dev);
0660b8a88d4d6a Elson Roy Serrao 2023-05-11 2411 return ret;
0660b8a88d4d6a Elson Roy Serrao 2023-05-11 2412 }
0660b8a88d4d6a Elson Roy Serrao 2023-05-11 2413
0660b8a88d4d6a Elson Roy Serrao 2023-05-11 2414 spin_lock_irqsave(&dwc->lock, flags);
0660b8a88d4d6a Elson Roy Serrao 2023-05-11 2415 ret = __dwc3_gadget_wakeup(dwc, true);
72246da40f3719 Felipe Balbi 2011-08-19 2416 spin_unlock_irqrestore(&dwc->lock, flags);
0660b8a88d4d6a Elson Roy Serrao 2023-05-11 2417 pm_runtime_put_noidle(dwc->dev);
72246da40f3719 Felipe Balbi 2011-08-19 2418
72246da40f3719 Felipe Balbi 2011-08-19 2419 return ret;
72246da40f3719 Felipe Balbi 2011-08-19 2420 }
72246da40f3719 Felipe Balbi 2011-08-19 2421
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2422 static void dwc3_resume_gadget(struct dwc3 *dwc);
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2423
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2424 static int dwc3_gadget_func_wakeup(struct usb_gadget *g, int intf_id)
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2425 {
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2426 struct dwc3 *dwc = gadget_to_dwc(g);
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2427 unsigned long flags;
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2428 int ret;
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2429 int link_state;
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2430
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2431 if (!dwc->wakeup_configured) {
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2432 dev_err(dwc->dev, "remote wakeup not configured\n");
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2433 return -EINVAL;
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2434 }
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2435
0660b8a88d4d6a Elson Roy Serrao 2023-05-11 2436 ret = pm_runtime_get_sync(dwc->dev);
0660b8a88d4d6a Elson Roy Serrao 2023-05-11 @2437 if (ret) {
Same.
0660b8a88d4d6a Elson Roy Serrao 2023-05-11 2438 pm_runtime_put(dwc->dev);
0660b8a88d4d6a Elson Roy Serrao 2023-05-11 2439 return ret;
0660b8a88d4d6a Elson Roy Serrao 2023-05-11 2440 }
0660b8a88d4d6a Elson Roy Serrao 2023-05-11 2441
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2442 spin_lock_irqsave(&dwc->lock, flags);
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2443 /*
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2444 * If the link is in U3, signal for remote wakeup and wait for the
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2445 * link to transition to U0 before sending device notification.
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2446 */
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2447 link_state = dwc3_gadget_get_link_state(dwc);
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2448 if (link_state == DWC3_LINK_STATE_U3) {
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2449 ret = __dwc3_gadget_wakeup(dwc, false);
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2450 if (ret) {
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2451 spin_unlock_irqrestore(&dwc->lock, flags);
0660b8a88d4d6a Elson Roy Serrao 2023-05-11 2452 pm_runtime_put_noidle(dwc->dev);
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2453 return -EINVAL;
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2454 }
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2455 dwc3_resume_gadget(dwc);
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2456 dwc->link_state = DWC3_LINK_STATE_U0;
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2457 }
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2458
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2459 ret = dwc3_send_gadget_generic_command(dwc, DWC3_DGCMD_DEV_NOTIFICATION,
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2460 DWC3_DGCMDPAR_DN_FUNC_WAKE |
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2461 DWC3_DGCMDPAR_INTF_SEL(intf_id));
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2462 if (ret)
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2463 dev_err(dwc->dev, "function remote wakeup failed, ret:%d\n", ret);
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2464
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2465 spin_unlock_irqrestore(&dwc->lock, flags);
0660b8a88d4d6a Elson Roy Serrao 2023-05-11 2466 pm_runtime_put_noidle(dwc->dev);
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2467
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2468 return ret;
92c08a84b53e5d Elson Roy Serrao 2023-03-24 2469 }
