Commit 22e05b45 authored Oct 05, 2008 by Sergei Shtylylov Committed by Bartlomiej Zolnierkiewicz Oct 05, 2008

ide-dma: fix ide_build_dmatable() for TRM290

Apparently, 'xcount' being 0 does not mean 0 bytes for TRM290; it means 4 bytes,
judging from the code immediately preceding this check. So, we must never try
to "split" the PRD for TRM290.

This is probably never hit anyway -- with the DMA buffers aligned to at least
512 bytes and ATAPI DMA not being used for non block I/O commands...

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

parent f20f2586

drivers/ide/ide-dma.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -211,7 +211,7 @@ int ide_build_dmatable (ide_drive_t drive, struct request rq)
		xcount = bcount & 0xffff;
		if (is_trm290)
		xcount = ((xcount >> 2) - 1) << 16;
		if (xcount == 0x0000) {
		else if (xcount == 0x0000) {
		/*
		* Most chipsets correctly interpret a length of 0x0000 as 64KB,
		* but at least one (e.g. CS5530) misinterprets it as zero (!).