line6_write_data() is never called in atomic context.
The call chains ending up at line6_write_data() are: [1] line6_write_data() <- toneport_setup() <- toneport_init() <- line6_probe() [2] line6_write_data() <- toneport_setup() <- toneport_reset_resume()
line6_probe() is called in toneport_probe(), pod_probe(), podhd_probe() and variax_probe(), which are set as ".probe" in usb_driver structure. toneport_reset_resume() is set as ".reset_resume" in usb_driver structure. These functions are not called in atomic context.
Despite never getting called from atomic context, line6_write_data() calls mdelay for busy wait. That is not necessary and can be replaced with msleep to avoid busy waiting.
This is found by a static analysis tool named DCNS written by myself.
Signed-off-by: Jia-Ju Bai baijiaju1990@gmail.com --- sound/usb/line6/driver.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sound/usb/line6/driver.c b/sound/usb/line6/driver.c index 0ff5a7d..29acd86 100644 --- a/sound/usb/line6/driver.c +++ b/sound/usb/line6/driver.c @@ -426,7 +426,7 @@ int line6_write_data(struct usb_line6 *line6, unsigned address, void *data, }
for (count = 0; count < LINE6_READ_WRITE_MAX_RETRIES; count++) { - mdelay(LINE6_READ_WRITE_STATUS_DELAY); + msleep(LINE6_READ_WRITE_STATUS_DELAY);
ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,