From b15b3ebae102f89c25ccbcae0b2099af312f2e82 Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Fri, 1 Aug 2008 09:18:34 +0100 Subject: libata: Fix a large collection of DMA mode mismatches MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Dave Müller sent a diff for the pata_oldpiix that highlighted a problem where a lot of the ATA drivers assume dma_mode == 0 means "no DMA" while the core code uses 0xFF. This turns out to have other consequences such as code doing >= XFER_UDMA_0 also catching 0xFF as UDMAlots. Fortunately it doesn't generally affect set_dma_mode, although some drivers call back into their own set mode code from other points. Having been through the drivers I've added helpers for using_udma/using_mwdma dma_enabled so that people don't open code ranges that may change (eg if UDMA8 appears somewhere) Thanks to David for the initial bits [and added fix for pata_oldpiix from and signed-off-by Dave Mueller -jg] Signed-off-by: Alan Cox Signed-off-by: Jeff Garzik --- drivers/ata/libata-core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/ata/libata-core.c') diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 5f8f57a818fb..79e3a8e7a84a 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -3288,7 +3288,7 @@ int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev) dev->dma_mode = ata_xfer_mask2mode(dma_mask); found = 1; - if (dev->dma_mode != 0xff) + if (ata_dma_enabled(dev)) used_dma = 1; } if (!found) @@ -3313,7 +3313,7 @@ int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev) /* step 3: set host DMA timings */ ata_link_for_each_dev(dev, link) { - if (!ata_dev_enabled(dev) || dev->dma_mode == 0xff) + if (!ata_dev_enabled(dev) || !ata_dma_enabled(dev)) continue; dev->xfer_mode = dev->dma_mode; -- cgit v1.2.3-58-ga151