em28xx-dvb: stop URBs when stopping the streaming
Commit Message
Stop the URBs in em28xx_stop_streaming(), so that em28xx_irq_callback()
cannot be called after the streaming has stopped.
This should eliminate the crashes reported by Antti Palosaari and the warnings
reported by Andy Furniss.
Signed-off-by: Gianluca Gennari <gennarone@gmail.com>
---
drivers/media/video/em28xx/em28xx-core.c | 26 +++++++++++++++++++++++++-
drivers/media/video/em28xx/em28xx-dvb.c | 2 +-
drivers/media/video/em28xx/em28xx.h | 1 +
3 files changed, 27 insertions(+), 2 deletions(-)
@@ -666,7 +666,6 @@ int em28xx_capture_start(struct em28xx *dev, int start)
return rc;
}
-EXPORT_SYMBOL_GPL(em28xx_capture_start);
int em28xx_vbi_supported(struct em28xx *dev)
{
@@ -1008,6 +1007,31 @@ void em28xx_uninit_isoc(struct em28xx *dev, enum em28xx_mode mode)
EXPORT_SYMBOL_GPL(em28xx_uninit_isoc);
/*
+ * Stop URBs
+ */
+void em28xx_stop_urbs(struct em28xx *dev)
+{
+ int i;
+ struct urb *urb;
+ struct em28xx_usb_isoc_bufs *isoc_bufs = &dev->isoc_ctl.digital_bufs;
+
+ em28xx_isocdbg("em28xx: called em28xx_stop_urbs\n");
+
+ for (i = 0; i < isoc_bufs->num_bufs; i++) {
+ urb = isoc_bufs->urb[i];
+ if (urb) {
+ if (!irqs_disabled())
+ usb_kill_urb(urb);
+ else
+ usb_unlink_urb(urb);
+ }
+ }
+
+ em28xx_capture_start(dev, 0);
+}
+EXPORT_SYMBOL_GPL(em28xx_stop_urbs);
+
+/*
* Allocate URBs
*/
int em28xx_alloc_isoc(struct em28xx *dev, enum em28xx_mode mode,
@@ -183,7 +183,7 @@ static int em28xx_stop_streaming(struct em28xx_dvb *dvb)
{
struct em28xx *dev = dvb->adapter.priv;
- em28xx_capture_start(dev, 0);
+ em28xx_stop_urbs(dev);
em28xx_set_mode(dev, EM28XX_SUSPEND);
@@ -695,6 +695,7 @@ int em28xx_init_isoc(struct em28xx *dev, enum em28xx_mode mode,
int max_packets, int num_bufs, int max_pkt_size,
int (*isoc_copy) (struct em28xx *dev, struct urb *urb));
void em28xx_uninit_isoc(struct em28xx *dev, enum em28xx_mode mode);
+void em28xx_stop_urbs(struct em28xx *dev);
int em28xx_isoc_dvb_max_packetsize(struct em28xx *dev);
int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode);
int em28xx_gpio_set(struct em28xx *dev, struct em28xx_reg_seq *gpio);