On 04/07/2014 01:20 PM, Divneil Wadhawan wrote: > Hi Hans, >> Two more questions: >> >> Which kernel version are you using? > 3.4.58 That should be new enough, I see no important differences between 3.4 and 3.14 in this respect. But really, 3.4? That's over two years old! If you have control over what kernel you use then I recommend you upgrade. >> Which capture driver are you using? > It's a TSMUX driver, written locally. I have not seen any reports of problems with vmalloc with arm in a long time. I know the uvc driver uses vmalloc, and that's used frequently. Question: if you use MEMORY_MMAP instead of USERPTR, does that work? Have you tried to stream with v4l2-ctl? It's available here: http://git.linuxtv.org/cgit.cgi/v4l-utils.git/. It's the reference implementation of how to stream, so if that fails as well, then at least its not your application. Testing whether you see the same when capturing from a usb uvc webcam (most webcams are uvc these days) would be useful as well. If it works with a uvc webcam, but not with your driver, then I suspect the driver. Regards, Hans -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
