pata_rdc: parallel scanning needs an extra locking

This is similar change as commit 60c3be3 ("ata_piix: parallel scanning
on PATA needs an extra locking") for ata_piix host driver.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/ata/pata_rdc.c b/drivers/ata/pata_rdc.c
index 4d318f86ae86..f52831f904cf 100644
--- a/drivers/ata/pata_rdc.c
+++ b/drivers/ata/pata_rdc.c
@@ -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 = {