From 9d51af7bd2f1d730cb6eeeb9ff837e3441ad4e07 Mon Sep 17 00:00:00 2001 From: Mark Lord Date: Tue, 10 Mar 2009 16:28:51 -0400 Subject: sata_mv: fix MSI irq race condition Fix a (rare) race condition in mv_interrupt() when using MSI. The value of hpriv->main_irq_mask_addr can change on on the fly, and without this patch we could end up writing back a stale copy to the hardware. Signed-off-by: Mark Lord Signed-off-by: Jeff Garzik --- drivers/ata/sata_mv.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/ata') diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c index 7007edd2d451..74b1080d116d 100644 --- a/drivers/ata/sata_mv.c +++ b/drivers/ata/sata_mv.c @@ -2218,12 +2218,13 @@ static irqreturn_t mv_interrupt(int irq, void *dev_instance) else handled = mv_host_intr(host, pending_irqs); } - spin_unlock(&host->lock); /* for MSI: unmask; interrupt cause bits will retrigger now */ if (using_msi) writel(hpriv->main_irq_mask, hpriv->main_irq_mask_addr); + spin_unlock(&host->lock); + return IRQ_RETVAL(handled); } -- cgit v1.2.1 From e3e4385f6181f434c0d786998ad1d0eef4e21c9b Mon Sep 17 00:00:00 2001 From: Stuart MENEFY Date: Tue, 10 Mar 2009 11:38:13 +0000 Subject: libata: Keep shadow last_ctl up to date during resets libata keeps a shadow copy of the ATA CTL register (which is write only), and only writes to the hardware when the required value doesn't match the shadow. However this copy wasn't being maintained when performing reset functions. This could cause problems for the first operation after a reset when the correct value might not be written to the CTL register. This problem was observed when hotplugging a drive: the identify command was being issued with interrupts enabled, when they should have been disabled. Signed-off-by: Stuart Menefy Signed-off-by: Jeff Garzik --- drivers/ata/libata-sff.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'drivers/ata') diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c index 714cb046b594..f93dc029dfde 100644 --- a/drivers/ata/libata-sff.c +++ b/drivers/ata/libata-sff.c @@ -2066,6 +2066,7 @@ static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask, iowrite8(ap->ctl | ATA_SRST, ioaddr->ctl_addr); udelay(20); /* FIXME: flush */ iowrite8(ap->ctl, ioaddr->ctl_addr); + ap->last_ctl = ap->ctl; /* wait the port to become ready */ return ata_sff_wait_after_reset(&ap->link, devmask, deadline); @@ -2190,8 +2191,10 @@ void ata_sff_postreset(struct ata_link *link, unsigned int *classes) } /* set up device control */ - if (ap->ioaddr.ctl_addr) + if (ap->ioaddr.ctl_addr) { iowrite8(ap->ctl, ap->ioaddr.ctl_addr); + ap->last_ctl = ap->ctl; + } } EXPORT_SYMBOL_GPL(ata_sff_postreset); @@ -2534,6 +2537,7 @@ void ata_bus_reset(struct ata_port *ap) if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) { /* set up device control for ATA_FLAG_SATA_RESET */ iowrite8(ap->ctl, ioaddr->ctl_addr); + ap->last_ctl = ap->ctl; } DPRINTK("EXIT\n"); -- cgit v1.2.1 From e9c1670c2a14ef9cc20d86b24b829f3947aad34e Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Tue, 3 Mar 2009 13:52:16 +0900 Subject: ata_piix: add workaround for Samsung DB-P70 Samsung DB-P70 somehow botched the first ICH9 SATA port. The board doesn't expose the first port but somehow SStatus reports link online while failing SRST protocol leading to repeated probe failures and thus long boot delay. Because the BIOS doesn't carry any identifying DMI information, the port can't be blacklisted safely. Fortunately, the controller does have subsystem vendor and ID set. It's unclear whether the subsystem IDs are used only for the board but it can be safely worked around by disabling SIDPR access and just using SRST works around the problem. Even when the workaround is triggered on an unaffected board the only side effect will be missing SCR access. Signed-off-by: Tejun Heo Reported-by: Joseph Jang Reported-by: Jonghyon Sohn Signed-off-by: Jeff Garzik --- drivers/ata/ata_piix.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) (limited to 'drivers/ata') diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c index 54961c0b2c73..ef8b30d577bd 100644 --- a/drivers/ata/ata_piix.c +++ b/drivers/ata/ata_piix.c @@ -1289,6 +1289,39 @@ static const int *__devinit piix_init_sata_map(struct pci_dev *pdev, return map; } +static bool piix_no_sidpr(struct ata_host *host) +{ + struct pci_dev *pdev = to_pci_dev(host->dev); + + /* + * Samsung DB-P70 only has three ATA ports exposed and + * curiously the unconnected first port reports link online + * while not responding to SRST protocol causing excessive + * detection delay. + * + * Unfortunately, the system doesn't carry enough DMI + * information to identify the machine but does have subsystem + * vendor and device set. As it's unclear whether the + * subsystem vendor/device is used only for this specific + * board, the port can't be disabled solely with the + * information; however, turning off SIDPR access works around + * the problem. Turn it off. + * + * This problem is reported in bnc#441240. + * + * https://bugzilla.novell.com/show_bug.cgi?id=441420 + */ + if (pdev->vendor == PCI_VENDOR_ID_INTEL && pdev->device == 0x2920 && + pdev->subsystem_vendor == PCI_VENDOR_ID_SAMSUNG && + pdev->subsystem_device == 0xb049) { + dev_printk(KERN_WARNING, host->dev, + "Samsung DB-P70 detected, disabling SIDPR\n"); + return true; + } + + return false; +} + static int __devinit piix_init_sidpr(struct ata_host *host) { struct pci_dev *pdev = to_pci_dev(host->dev); @@ -1302,6 +1335,10 @@ static int __devinit piix_init_sidpr(struct ata_host *host) if (hpriv->map[i] == IDE) return 0; + /* is it blacklisted? */ + if (piix_no_sidpr(host)) + return 0; + if (!(host->ports[0]->flags & PIIX_FLAG_SIDPR)) return 0; -- cgit v1.2.1