Author: marius
Date: Tue Sep 14 20:41:06 2010
New Revision: 212621
URL: http://svn.freebsd.org/changeset/base/212621
Log:
Use saner nsegments and maxsegsz parameters when creating certain DMA tags;
tags for 1-byte allocations cannot possibly be split across 2 segments and
maxsegsz must not exceed maxsize.
Modified:
head/sys/dev/usb/usb_busdma.c
Modified: head/sys/dev/usb/usb_busdma.c
==============================================================================
--- head/sys/dev/usb/usb_busdma.c Tue Sep 14 20:31:09 2010
(r212620)
+++ head/sys/dev/usb/usb_busdma.c Tue Sep 14 20:41:06 2010
(r212621)
@@ -366,9 +366,9 @@ usb_dma_tag_create(struct usb_dma_tag *u
/* filter */ NULL,
/* filterarg */ NULL,
/* maxsize */ size,
- /* nsegments */ (align == 1) ?
+ /* nsegments */ (align == 1 && size > 1) ?
(2 + (size / USB_PAGE_SIZE)) : 1,
- /* maxsegsz */ (align == 1) ?
+ /* maxsegsz */ (align == 1 && size > USB_PAGE_SIZE) ?
USB_PAGE_SIZE : size,
/* flags */ BUS_DMA_KEEP_PG_OFFSET,
/* lockfn */ &usb_dma_lock_cb,
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