lkml.org 
[lkml]   [2010]   [May]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [alsa-devel] USB transfer_buffer allocations on 64bit systems
On Tue, May 11, 2010 at 10:57:07AM -0400, Alan Stern wrote:
> There are no calls to any dma_sync_* routines. Daniel will have to
> check me on this, but I believe that urb->transfer_buffer is filled
> before dma_map_single() is called and it isn't touched again until
> after dma_unmap_single() (which occurs before urb's completion handler
> is called).

Yes, that's correct. Sorry fot the misleading information I gave. The
code doesn't to any weird tricks as it currently stands. It fills the
buffer, submits the URB and doesn't touch the buffer contents
afterwards.

Daniel



\
 
 \ /
  Last update: 2010-05-12 10:17    [W:0.515 / U:0.104 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site