From 21f5a32e1f0a4ae086e4985d4a949e7289440c3a Mon Sep 17 00:00:00 2001 From: Antti Palosaari Date: Sun, 3 Jun 2012 15:49:45 -0300 Subject: [PATCH] [media] dvb_usb_v2: delay firmware download as it blocks module init Delay firmware download and whole driver initialization using workqueue. udev causes problems when blocking firmware download was done during module init. This will likely resolve all DVB USB firmware downloading issues we have had during recent years. Fixes bug in case of DVB USB driver: https://bugzilla.redhat.com/show_bug.cgi?id=827538 Signed-off-by: Antti Palosaari Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb/dvb-usb/dvb_usb_init.c | 77 +++++++++++++++++++++++- 1 file changed, 75 insertions(+), 2 deletions(-) diff --git a/drivers/media/dvb/dvb-usb/dvb_usb_init.c b/drivers/media/dvb/dvb-usb/dvb_usb_init.c index 61ec808dd6d9..561ceb69144f 100644 --- a/drivers/media/dvb/dvb-usb/dvb_usb_init.c +++ b/drivers/media/dvb/dvb-usb/dvb_usb_init.c @@ -217,7 +217,7 @@ int dvb_usb_device_power_ctrl(struct dvb_usb_device *d, int onoff) /* * USB */ -int dvb_usbv2_device_init(struct usb_interface *intf, +int dvb_usbv2_device_init_(struct usb_interface *intf, const struct usb_device_id *id) { struct usb_device *udev = interface_to_usbdev(intf); @@ -295,12 +295,85 @@ err_kfree: return ret; } + +/* + * udev, which is used for the firmware downloading, requires we cannot + * block during module_init(). module_init() calls USB probe() which + * is this routine. Due to that we delay actual operation using workqueue + * and return always success here. + */ + +struct dvb_usb_delayed_init { + struct usb_interface *intf; + const struct usb_device_id *id; + struct work_struct work; +}; + +static void dvb_usbv2_init_work(struct work_struct *work) +{ + int ret; + struct dvb_usb_delayed_init *delayed_init = + container_of(work, struct dvb_usb_delayed_init, work); + + ret = dvb_usbv2_device_init_(delayed_init->intf, delayed_init->id); + if (ret < 0) { + usb_driver_release_interface( + to_usb_driver(delayed_init->intf->dev.driver), + delayed_init->intf); + kfree(delayed_init); + goto err; + } + + kfree(delayed_init); + + return; +err: + pr_debug("%s: failed=%d\n", __func__, ret); + return; +} + +int dvb_usbv2_device_init(struct usb_interface *intf, + const struct usb_device_id *id) +{ + int ret; + struct dvb_usb_delayed_init *delayed_init; + + delayed_init = kzalloc(sizeof(struct dvb_usb_delayed_init), GFP_KERNEL); + if (!delayed_init) { + pr_err("%s: kzalloc() failed", DVB_USB_LOG_PREFIX); + ret = -ENOMEM; + goto err; + } + + delayed_init->intf = intf; + delayed_init->id = id; + INIT_WORK(&delayed_init->work, dvb_usbv2_init_work); + + ret = schedule_work(&delayed_init->work); + if (ret < 0) { + pr_err("%s: schedule_work() failed", DVB_USB_LOG_PREFIX); + goto err_kfree; + } + + return 0; +err_kfree: + kfree(delayed_init); +err: + pr_debug("%s: failed=%d\n", __func__, ret); + return ret; +} + EXPORT_SYMBOL(dvb_usbv2_device_init); void dvb_usbv2_device_exit(struct usb_interface *intf) { struct dvb_usb_device *d = usb_get_intfdata(intf); - const char *name = NULL; + const char *name = "generic DVB-USB module"; + + /* + * FIXME: we should ensure our device initialization work is finished + * until exit from this routine (cancel_work_sync?) + */ usb_set_intfdata(intf, NULL); if (d) { -- 2.20.1