Commit bb612cba authored by Bartlomiej Zolnierkiewicz's avatar Bartlomiej Zolnierkiewicz Committed by Jeff Garzik

pata_rdc: parallel scanning needs an extra locking

This is similar change as commit 60c3be38 ("ata_piix: parallel scanning
on PATA needs an extra locking") for ata_piix host driver.
Signed-off-by: Bartlomiej Zolnierkiewicz's avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
parent d9d57984
......@@ -86,6 +86,8 @@ static int rdc_pata_prereset(struct ata_link *link, unsigned long deadline)
return ata_sff_prereset(link, deadline);
}
static DEFINE_SPINLOCK(rdc_lock);
/**
* rdc_set_piomode - Initialize host controller PATA PIO timings
* @ap: Port whose timings we are configuring
......@@ -101,6 +103,7 @@ static void rdc_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
unsigned int pio = adev->pio_mode - XFER_PIO_0;
struct pci_dev *dev = to_pci_dev(ap->host->dev);
unsigned long flags;
unsigned int is_slave = (adev->devno != 0);
unsigned int master_port= ap->port_no ? 0x42 : 0x40;
unsigned int slave_port = 0x44;
......@@ -124,6 +127,8 @@ static void rdc_set_piomode(struct ata_port *ap, struct ata_device *adev)
if (adev->class == ATA_DEV_ATA)
control |= 4; /* PPE enable */
spin_lock_irqsave(&rdc_lock, flags);
/* PIO configuration clears DTE unconditionally. It will be
* programmed in set_dmamode which is guaranteed to be called
* after set_piomode if any DMA mode is available.
......@@ -161,6 +166,8 @@ static void rdc_set_piomode(struct ata_port *ap, struct ata_device *adev)
pci_read_config_byte(dev, 0x48, &udma_enable);
udma_enable &= ~(1 << (2 * ap->port_no + adev->devno));
pci_write_config_byte(dev, 0x48, udma_enable);
spin_unlock_irqrestore(&rdc_lock, flags);
}
/**
......@@ -177,6 +184,7 @@ static void rdc_set_piomode(struct ata_port *ap, struct ata_device *adev)
static void rdc_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *dev = to_pci_dev(ap->host->dev);
unsigned long flags;
u8 master_port = ap->port_no ? 0x42 : 0x40;
u16 master_data;
u8 speed = adev->dma_mode;
......@@ -190,6 +198,8 @@ static void rdc_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{ 2, 1 },
{ 2, 3 }, };
spin_lock_irqsave(&rdc_lock, flags);
pci_read_config_word(dev, master_port, &master_data);
pci_read_config_byte(dev, 0x48, &udma_enable);
......@@ -271,6 +281,8 @@ static void rdc_set_dmamode(struct ata_port *ap, struct ata_device *adev)
pci_write_config_word(dev, master_port, master_data);
}
pci_write_config_byte(dev, 0x48, udma_enable);
spin_unlock_irqrestore(&rdc_lock, flags);
}
static struct ata_port_operations rdc_pata_ops = {
......
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