From: Bartlomiej Zolnierkiewicz Date: Wed, 17 Feb 2010 13:17:31 +0000 (+0000) Subject: [libata] pata_atiixp: add locking for parallel scanning X-Git-Tag: upstream/snapshot3+hdmi~15538^2~4 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e99846f18f03badd1bbd4fda79e6ec325e3b9058;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git [libata] pata_atiixp: add locking for parallel scanning This is similar change as commit 60c3be3 for ata_piix host driver and while pata_atiixp doesn't enable parallel scan yet the race could probably also be triggered by requesting re-scanning of both ports at the same time using SCSI sysfs interface. [Ported to current tree without other patch dependancies by Alan Cox] Original is Signed-off-by: Bartlomiej Zolnierkiewicz This one is Signed-off-by: Alan Cox Signed-off-by: Jeff Garzik --- diff --git a/drivers/ata/pata_atiixp.c b/drivers/ata/pata_atiixp.c index f697b5b..9ad3b4c 100644 --- a/drivers/ata/pata_atiixp.c +++ b/drivers/ata/pata_atiixp.c @@ -1,7 +1,7 @@ /* * pata_atiixp.c - ATI PATA for new ATA layer * (C) 2005 Red Hat Inc - * (C) 2009 Bartlomiej Zolnierkiewicz + * (C) 2009-2010 Bartlomiej Zolnierkiewicz * * Based on * @@ -46,6 +46,8 @@ static int atiixp_cable_detect(struct ata_port *ap) return ATA_CBL_PATA40; } +static DEFINE_SPINLOCK(atiixp_lock); + /** * atiixp_set_pio_timing - set initial PIO mode data * @ap: ATA interface @@ -88,7 +90,10 @@ static void atiixp_set_pio_timing(struct ata_port *ap, struct ata_device *adev, static void atiixp_set_piomode(struct ata_port *ap, struct ata_device *adev) { + unsigned long flags; + spin_lock_irqsave(&atiixp_lock, flags); atiixp_set_pio_timing(ap, adev, adev->pio_mode - XFER_PIO_0); + spin_unlock_irqrestore(&atiixp_lock, flags); } /** @@ -108,6 +113,9 @@ static void atiixp_set_dmamode(struct ata_port *ap, struct ata_device *adev) int dma = adev->dma_mode; int dn = 2 * ap->port_no + adev->devno; int wanted_pio; + unsigned long flags; + + spin_lock_irqsave(&atiixp_lock, flags); if (adev->dma_mode >= XFER_UDMA_0) { u16 udma_mode_data; @@ -145,6 +153,7 @@ static void atiixp_set_dmamode(struct ata_port *ap, struct ata_device *adev) if (adev->pio_mode != wanted_pio) atiixp_set_pio_timing(ap, adev, wanted_pio); + spin_unlock_irqrestore(&atiixp_lock, flags); } /**