On Wed, Dec 9, 2009 at 6:36 AM, <[email protected]> wrote: > From: Muralidharan Karicheri <[email protected]> > > If a USERPTR address that is not aligned to page boundary is passed to the > videobuf_dma_contig_user_get() function, it saves a page aligned address to > the dma_handle. This is not correct. This issue is observed when using USERPTR > IO machism for buffer exchange. > > Updates from last version:- > > Adding offset for size calculation as per comment from Magnus Damm. This > ensures the last page is also included for checking if memory is > contiguous. > > Signed-off-by: Muralidharan Karicheri <[email protected]>
Hi Murali, I've spent some time testing this patch with the SuperH CEU driver in USERPTR mode. My test case is based on capture.c with places a bunch of QVGA frames directly after each other. The size of each QVGA frame is not an even multiple of 4k page size, so some of the frames will use a non-aligned start addresses. Currently the CEU driver page aligns the size of each frame, but I'll fix that in an upcoming patch. Thank you! Acked-by: Magnus Damm <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
