Author: hselasky Date: Tue Nov 24 12:23:15 2015 New Revision: 291252 URL: https://svnweb.freebsd.org/changeset/base/291252
Log: MFC r290326: Relax the BUS_DMA_KEEP_PG_OFFSET requirement to allow optimising allocation of DMA bounce buffers. Discussed with: ian @ Modified: stable/8/sys/dev/usb/usb_busdma.c Directory Properties: stable/8/sys/ (props changed) stable/8/sys/dev/ (props changed) stable/8/sys/dev/usb/ (props changed) Modified: stable/8/sys/dev/usb/usb_busdma.c ============================================================================== --- stable/8/sys/dev/usb/usb_busdma.c Tue Nov 24 12:19:20 2015 (r291251) +++ stable/8/sys/dev/usb/usb_busdma.c Tue Nov 24 12:23:15 2015 (r291252) @@ -439,9 +439,13 @@ usb_pc_common_mem_cb(void *arg, bus_dma_ pc->page_offset_buf = rem; pc->page_offset_end += rem; #ifdef USB_DEBUG - if (rem != (USB_P2U(pc->buffer) & (USB_PAGE_SIZE - 1))) { + if (nseg > 1 && + ((segs->ds_addr + segs->ds_len) & (USB_PAGE_SIZE - 1)) != + ((segs + 1)->ds_addr & (USB_PAGE_SIZE - 1))) { /* - * This check verifies that the physical address is correct: + * This check verifies there is no page offset hole + * between the first and second segment. See the + * BUS_DMA_KEEP_PG_OFFSET flag. */ DPRINTFN(0, "Page offset was not preserved\n"); error = 1; _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"