From e4acba3c01ca8b275dda22664191c30ee352a38e Mon Sep 17 00:00:00 2001 From: Deti Fliegl Date: Mon, 9 Jan 2006 15:25:23 -0200 Subject: [PATCH] DVB (2401): USB hot unplug Oops fix. - USB hot unplug Oops fix. Signed-off-by: Deti Fliegl Signed-off-by: Johannes Stezenbach Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb/cinergyT2/cinergyT2.c | 71 ++++++++++++++++--------- 1 file changed, 47 insertions(+), 24 deletions(-) diff --git a/drivers/media/dvb/cinergyT2/cinergyT2.c b/drivers/media/dvb/cinergyT2/cinergyT2.c index e2598bbc2b..c4b4c5b6b7 100644 --- a/drivers/media/dvb/cinergyT2/cinergyT2.c +++ b/drivers/media/dvb/cinergyT2/cinergyT2.c @@ -131,6 +131,8 @@ struct cinergyt2 { wait_queue_head_t poll_wq; int pending_fe_events; + int disconnect_pending; + atomic_t inuse; void *streambuf; dma_addr_t streambuf_dmahandle; @@ -343,7 +345,7 @@ static int cinergyt2_start_feed(struct dvb_demux_feed *dvbdmxfeed) struct dvb_demux *demux = dvbdmxfeed->demux; struct cinergyt2 *cinergyt2 = demux->priv; - if (down_interruptible(&cinergyt2->sem)) + if (cinergyt2->disconnect_pending || down_interruptible(&cinergyt2->sem)) return -ERESTARTSYS; if (cinergyt2->streaming == 0) @@ -359,7 +361,7 @@ static int cinergyt2_stop_feed(struct dvb_demux_feed *dvbdmxfeed) struct dvb_demux *demux = dvbdmxfeed->demux; struct cinergyt2 *cinergyt2 = demux->priv; - if (down_interruptible(&cinergyt2->sem)) + if (cinergyt2->disconnect_pending || down_interruptible(&cinergyt2->sem)) return -ERESTARTSYS; if (--cinergyt2->streaming == 0) @@ -479,23 +481,37 @@ static int cinergyt2_open (struct inode *inode, struct file *file) { struct dvb_device *dvbdev = file->private_data; struct cinergyt2 *cinergyt2 = dvbdev->priv; - int err; + int err = -ERESTARTSYS; - if ((err = dvb_generic_open(inode, file))) + if (cinergyt2->disconnect_pending || down_interruptible(&cinergyt2->sem)) + return -ERESTARTSYS; + + if ((err = dvb_generic_open(inode, file))) { + up(&cinergyt2->sem); return err; + } - if (down_interruptible(&cinergyt2->sem)) - return -ERESTARTSYS; if ((file->f_flags & O_ACCMODE) != O_RDONLY) { cinergyt2_sleep(cinergyt2, 0); schedule_delayed_work(&cinergyt2->query_work, HZ/2); } + atomic_inc(&cinergyt2->inuse); + up(&cinergyt2->sem); return 0; } +static void cinergyt2_unregister(struct cinergyt2 *cinergyt2) +{ + dvb_unregister_device(cinergyt2->fedev); + dvb_unregister_adapter(&cinergyt2->adapter); + + cinergyt2_free_stream_urbs(cinergyt2); + kfree(cinergyt2); +} + static int cinergyt2_release (struct inode *inode, struct file *file) { struct dvb_device *dvbdev = file->private_data; @@ -504,7 +520,7 @@ static int cinergyt2_release (struct inode *inode, struct file *file) if (down_interruptible(&cinergyt2->sem)) return -ERESTARTSYS; - if ((file->f_flags & O_ACCMODE) != O_RDONLY) { + if (!cinergyt2->disconnect_pending && (file->f_flags & O_ACCMODE) != O_RDONLY) { cancel_delayed_work(&cinergyt2->query_work); flush_scheduled_work(); cinergyt2_sleep(cinergyt2, 1); @@ -512,6 +528,11 @@ static int cinergyt2_release (struct inode *inode, struct file *file) up(&cinergyt2->sem); + if (atomic_dec_and_test(&cinergyt2->inuse) && cinergyt2->disconnect_pending) { + warn("delayed unregister in release"); + cinergyt2_unregister(cinergyt2); + } + return dvb_generic_release(inode, file); } @@ -519,7 +540,14 @@ static unsigned int cinergyt2_poll (struct file *file, struct poll_table_struct { struct dvb_device *dvbdev = file->private_data; struct cinergyt2 *cinergyt2 = dvbdev->priv; + + if (cinergyt2->disconnect_pending || down_interruptible(&cinergyt2->sem)) + return -ERESTARTSYS; + poll_wait(file, &cinergyt2->poll_wq, wait); + + up(&cinergyt2->sem); + return (POLLIN | POLLRDNORM | POLLPRI); } @@ -585,7 +613,7 @@ static int cinergyt2_ioctl (struct inode *inode, struct file *file, if (copy_from_user(&p, (void __user*) arg, sizeof(p))) return -EFAULT; - if (down_interruptible(&cinergyt2->sem)) + if (cinergyt2->disconnect_pending || down_interruptible(&cinergyt2->sem)) return -ERESTARTSYS; param->cmd = CINERGYT2_EP1_SET_TUNER_PARAMETERS; @@ -696,7 +724,7 @@ static void cinergyt2_query_rc (void *data) struct cinergyt2_rc_event rc_events[12]; int n, len, i; - if (down_interruptible(&cinergyt2->sem)) + if (cinergyt2->disconnect_pending || down_interruptible(&cinergyt2->sem)) return; len = cinergyt2_command(cinergyt2, buf, sizeof(buf), @@ -791,7 +819,6 @@ static int cinergyt2_register_rc(struct cinergyt2 *cinergyt2) static void cinergyt2_unregister_rc(struct cinergyt2 *cinergyt2) { cancel_delayed_work(&cinergyt2->rc_query_work); - flush_scheduled_work(); input_unregister_device(cinergyt2->rc_input_dev); } @@ -822,7 +849,7 @@ static void cinergyt2_query (void *data) uint8_t lock_bits; uint32_t unc; - if (down_interruptible(&cinergyt2->sem)) + if (cinergyt2->disconnect_pending || down_interruptible(&cinergyt2->sem)) return; unc = s->uncorrected_block_count; @@ -922,28 +949,25 @@ static void cinergyt2_disconnect (struct usb_interface *intf) { struct cinergyt2 *cinergyt2 = usb_get_intfdata (intf); - if (down_interruptible(&cinergyt2->sem)) - return; + flush_scheduled_work(); cinergyt2_unregister_rc(cinergyt2); + cancel_delayed_work(&cinergyt2->query_work); + wake_up_interruptible(&cinergyt2->poll_wq); + cinergyt2->demux.dmx.close(&cinergyt2->demux.dmx); - dvb_net_release(&cinergyt2->dvbnet); - dvb_dmxdev_release(&cinergyt2->dmxdev); - dvb_dmx_release(&cinergyt2->demux); - dvb_unregister_device(cinergyt2->fedev); - dvb_unregister_adapter(&cinergyt2->adapter); + cinergyt2->disconnect_pending = 1; - cinergyt2_free_stream_urbs(cinergyt2); - up(&cinergyt2->sem); - kfree(cinergyt2); + if (!atomic_read(&cinergyt2->inuse)) + cinergyt2_unregister(cinergyt2); } static int cinergyt2_suspend (struct usb_interface *intf, pm_message_t state) { struct cinergyt2 *cinergyt2 = usb_get_intfdata (intf); - if (down_interruptible(&cinergyt2->sem)) + if (cinergyt2->disconnect_pending || down_interruptible(&cinergyt2->sem)) return -ERESTARTSYS; if (state.event > PM_EVENT_ON) { @@ -966,7 +990,7 @@ static int cinergyt2_resume (struct usb_interface *intf) struct cinergyt2 *cinergyt2 = usb_get_intfdata (intf); struct dvbt_set_parameters_msg *param = &cinergyt2->param; - if (down_interruptible(&cinergyt2->sem)) + if (cinergyt2->disconnect_pending || down_interruptible(&cinergyt2->sem)) return -ERESTARTSYS; if (!cinergyt2->sleeping) { @@ -1019,4 +1043,3 @@ module_exit (cinergyt2_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Holger Waechtler, Daniel Mack"); - -- 2.39.5