sata_promise: fix hardreset lockdep error

commit 3100d49d3cd236443faae9d81137c81b22d36003 upstream.

sata_promise's pdc_hard_reset_port() needs to serialize because it
flips a port-specific bit in controller register that's shared by
all ports. The code takes the ata host lock for this, but that's
broken because an interrupt may arrive on our irq during the hard
reset sequence, and that too will take the ata host lock. With
lockdep enabled a big nasty warning is seen.

Fixed by adding private state to the ata host structure, containing
a second lock used only for serializing the hard reset sequences.
This eliminated the lockdep warnings both on my test rig and on
the original reporter's machine.

Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>
Tested-by: Adko Branil <adkobranil@yahoo.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/ata/sata_promise.c b/drivers/ata/sata_promise.c
index a004b1e0ea6d6d8b4d1dc12249d9fe477905d961..ca4646aa0d6bd2b8c0432a71539a6cd813a0913b 100644 (file)
--- a/drivers/ata/sata_promise.c
+++ b/drivers/ata/sata_promise.c
@@ -147,6 +147,10 @@ struct pdc_port_priv {
        dma_addr_t              pkt_dma;
 };
 
+struct pdc_host_priv {
+       spinlock_t hard_reset_lock;
+};
+
 static int pdc_sata_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
 static int pdc_sata_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
 static int pdc_ata_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
@@ -801,9 +805,10 @@ static void pdc_hard_reset_port(struct ata_port *ap)
        void __iomem *host_mmio = ap->host->iomap[PDC_MMIO_BAR];
        void __iomem *pcictl_b1_mmio = host_mmio + PDC_PCI_CTL + 1;
        unsigned int ata_no = pdc_ata_port_to_ata_no(ap);
+       struct pdc_host_priv *hpriv = ap->host->private_data;
        u8 tmp;
 
-       spin_lock(&ap->host->lock);
+       spin_lock(&hpriv->hard_reset_lock);
 
        tmp = readb(pcictl_b1_mmio);
        tmp &= ~(0x10 << ata_no);
@@ -814,7 +819,7 @@ static void pdc_hard_reset_port(struct ata_port *ap)
        writeb(tmp, pcictl_b1_mmio);
        readb(pcictl_b1_mmio); /* flush */
 
-       spin_unlock(&ap->host->lock);
+       spin_unlock(&hpriv->hard_reset_lock);
 }
 
 static int pdc_sata_hardreset(struct ata_link *link, unsigned int *class,
@@ -1183,6 +1188,7 @@ static int pdc_ata_init_one(struct pci_dev *pdev,
        const struct ata_port_info *pi = &pdc_port_info[ent->driver_data];
        const struct ata_port_info *ppi[PDC_MAX_PORTS];
        struct ata_host *host;
+       struct pdc_host_priv *hpriv;
        void __iomem *host_mmio;
        int n_ports, i, rc;
        int is_sataii_tx4;
@@ -1220,6 +1226,11 @@ static int pdc_ata_init_one(struct pci_dev *pdev,
                dev_printk(KERN_ERR, &pdev->dev, "failed to allocate host\n");
                return -ENOMEM;
        }
+       hpriv = devm_kzalloc(&pdev->dev, sizeof *hpriv, GFP_KERNEL);
+       if (!hpriv)
+               return -ENOMEM;
+       spin_lock_init(&hpriv->hard_reset_lock);
+       host->private_data = hpriv;
        host->iomap = pcim_iomap_table(pdev);
 
        is_sataii_tx4 = pdc_is_sataii_tx4(pi->flags);