Hi Jia-Ju, > download_firmware() is never called from atomic context. > > It is only called by ll_setup() that is called only via function pointer > "->setup" used in hci_uart_setup() in drivers/bluetooth/hci_serdev.c and > drivers/bluetooth/hci_ldisc.c. hci_uart_setup() is called only > via function pointer "->setup" used in hci_dev_do_open() > in net/bluetooth/hci_core.c. > All of the above functions do not enter atomic context. > > Besides, ll_setup() calls msleep() and hci_dev_do_open calls mutex_lock(). > So it indicates that all the above functions call functions that can sleep. > > Despite never getting called from atomic context, download_firmware() > calls mdelay() for busy wait. > That is not necessary and can be replaced with msleep to avoid busy wait. > > This is found by a static analysis tool named DCNS written by myself. > > Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxxxx> > --- > drivers/bluetooth/hci_ll.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) patch has been applied to bluetooth-next tree. Regards Marcel -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
