From: Shane Huang Date: Tue, 16 Mar 2010 10:08:55 +0000 (+0800) Subject: ahci: pp->active_link is not reliable when FBS is enabled X-Git-Tag: upstream/snapshot3+hdmi~15047^2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5db5b0215af94a36d4bf10900ff9707b6d5c1610;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git ahci: pp->active_link is not reliable when FBS is enabled pp->active_link is not reliable when FBS is enabled. Both PORT_SCR_ACT and PORT_CMD_ISSUE should be checked because mixed NCQ and non-NCQ commands may be in flight. Signed-off-by: Shane Huang Signed-off-by: Jeff Garzik --- diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c index e7e2c7a..fdc9bcb 100644 --- a/drivers/ata/ahci.c +++ b/drivers/ata/ahci.c @@ -2278,7 +2278,7 @@ static void ahci_port_intr(struct ata_port *ap) struct ahci_port_priv *pp = ap->private_data; struct ahci_host_priv *hpriv = ap->host->private_data; int resetting = !!(ap->pflags & ATA_PFLAG_RESETTING); - u32 status, qc_active; + u32 status, qc_active = 0; int rc; status = readl(port_mmio + PORT_IRQ_STAT); @@ -2336,11 +2336,22 @@ static void ahci_port_intr(struct ata_port *ap) } } - /* pp->active_link is valid iff any command is in flight */ - if (ap->qc_active && pp->active_link->sactive) - qc_active = readl(port_mmio + PORT_SCR_ACT); - else - qc_active = readl(port_mmio + PORT_CMD_ISSUE); + /* pp->active_link is not reliable once FBS is enabled, both + * PORT_SCR_ACT and PORT_CMD_ISSUE should be checked because + * NCQ and non-NCQ commands may be in flight at the same time. + */ + if (pp->fbs_enabled) { + if (ap->qc_active) { + qc_active = readl(port_mmio + PORT_SCR_ACT); + qc_active |= readl(port_mmio + PORT_CMD_ISSUE); + } + } else { + /* pp->active_link is valid iff any command is in flight */ + if (ap->qc_active && pp->active_link->sactive) + qc_active = readl(port_mmio + PORT_SCR_ACT); + else + qc_active = readl(port_mmio + PORT_CMD_ISSUE); + } rc = ata_qc_complete_multiple(ap, qc_active);