Re: [linux-usb-devel] large buffers allocation and bulk tansfer

2006-10-03 Thread David Brownell
On Tuesday 03 October 2006 6:10 am, Rumjantsev Egor wrote: > Is it possible to allocate large buffers for bulk transfer with > vmalloc_32 function? Read the first section of Documentation/DMA-mapping.txt where it describes what memory is DMA-able. All buffers you pass to the USB subsystem (bulk

[linux-usb-devel] large buffers allocation and bulk tansfer

2006-10-03 Thread Rumjantsev Egor
Hello. Is it possible to allocate large buffers for bulk transfer with vmalloc_32 function? I need buffer about 4 Mb. I allocated it with vmalloc_32 function. After that usb_submit_urb() returned success but instead data which i wanted to receive in buffer was nothing. I've read the mailing list