diff options
| author | Patrick Boettcher <patrick.boettcher@desy.de> | 2005-08-27 19:30:30 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-08-27 11:03:45 -0700 |
| commit | 8126fdbc76351bdf99c6737ef4fecf88a22fa538 (patch) | |
| tree | c810f8f13be0e2eeec2f0bf9d92b21d746d3f15f /drivers/media/dvb/dvb-usb/dibusb-common.c | |
| parent | 820d220de400cfaaf846a2d8b5de93f9ea5a9b80 (diff) | |
[PATCH] fix for race problem in DVB USB drivers (dibusb)
Fixed race between submitting streaming URBs in the driver and starting
the actual transfer in hardware (demodulator and USB controller) which
sometimes lead to garbled data transfers. URBs are now submitted first,
then the transfer is enabled. Dibusb devices and clones are now fully
functional again.
Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/media/dvb/dvb-usb/dibusb-common.c')
| -rw-r--r-- | drivers/media/dvb/dvb-usb/dibusb-common.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/media/dvb/dvb-usb/dibusb-common.c b/drivers/media/dvb/dvb-usb/dibusb-common.c index 63b626f70c8..9b9d6f8ee74 100644 --- a/drivers/media/dvb/dvb-usb/dibusb-common.c +++ b/drivers/media/dvb/dvb-usb/dibusb-common.c @@ -70,13 +70,22 @@ EXPORT_SYMBOL(dibusb_power_ctrl); int dibusb2_0_streaming_ctrl(struct dvb_usb_device *d, int onoff) { - u8 b[2]; - b[0] = DIBUSB_REQ_SET_IOCTL; - b[1] = onoff ? DIBUSB_IOCTL_CMD_ENABLE_STREAM : DIBUSB_IOCTL_CMD_DISABLE_STREAM; + u8 b[3] = { 0 }; + int ret; + + if ((ret = dibusb_streaming_ctrl(d,onoff)) < 0) + return ret; - dvb_usb_generic_write(d,b,3); + if (onoff) { + b[0] = DIBUSB_REQ_SET_STREAMING_MODE; + b[1] = 0x00; + if ((ret = dvb_usb_generic_write(d,b,2)) < 0) + return ret; + } - return dibusb_streaming_ctrl(d,onoff); + b[0] = DIBUSB_REQ_SET_IOCTL; + b[1] = onoff ? DIBUSB_IOCTL_CMD_ENABLE_STREAM : DIBUSB_IOCTL_CMD_DISABLE_STREAM; + return dvb_usb_generic_write(d,b,3); } EXPORT_SYMBOL(dibusb2_0_streaming_ctrl); |