sata_promise: fix hardreset lockdep error
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>
Cc: stable@vger.kernel.org
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/ata/sata_promise.c b/drivers/ata/sata_promise.c
index 489c817..fb0dd87 100644
--- a/drivers/ata/sata_promise.c
+++ b/drivers/ata/sata_promise.c
@@ -147,6 +147,10 @@
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 @@
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 @@
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,
@@ -1182,6 +1187,7 @@
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;
@@ -1218,6 +1224,11 @@
dev_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);