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Commit 36abb3b1 authored by Kristian Høgsberg, Stefan Richter's avatar Kristian Høgsberg, Stefan Richter Committed by Stefan Richter
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firewire: Add a comment to describe why we split the sg list. 



Signed-off-by: default avatarKristian Hoegsberg <krh@redhat.com>
Signed-off-by: default avatarStefan Richter <stefanr@s5r6.in-berlin.de>
parent e1b68c4d

drivers/firewire/fw-sbp2.c

+4 −1
Original line number Diff line number Diff line
@@ -926,7 +926,10 @@ static int sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb) 


	/*

	 * Convert the scatterlist to an sbp2 page table.  If any

	 * scatterlist entries are too big for sbp2 we split the as we go.

	 * scatterlist entries are too big for sbp2, we split them as we

	 * go.  Even if we ask the block I/O layer to not give us sg

	 * elements larger than 65535 bytes, some IOMMUs may merge sg elements

	 * during DMA mapping, and Linux currently doesn't prevent this.

	 */

	for (i = 0, j = 0; i < count; i++) {

		sg_len = sg_dma_len(sg + i);