[libata] pata_atiixp: add locking for parallel scanning
This is similar change as commit 60c3be3 for ata_piix host driver
and while pata_atiixp doesn't enable parallel scan yet the race
could probably also be triggered by requesting re-scanning of both
ports at the same time using SCSI sysfs interface.
[Ported to current tree without other patch dependancies by Alan Cox]
Original is
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This one is
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/ata/pata_atiixp.c b/drivers/ata/pata_atiixp.c
index f697b5b..9ad3b4c 100644
--- a/drivers/ata/pata_atiixp.c
+++ b/drivers/ata/pata_atiixp.c
@@ -1,7 +1,7 @@
/*
* pata_atiixp.c - ATI PATA for new ATA layer
* (C) 2005 Red Hat Inc
- * (C) 2009 Bartlomiej Zolnierkiewicz
+ * (C) 2009-2010 Bartlomiej Zolnierkiewicz
*
* Based on
*
@@ -46,6 +46,8 @@
return ATA_CBL_PATA40;
}
+static DEFINE_SPINLOCK(atiixp_lock);
+
/**
* atiixp_set_pio_timing - set initial PIO mode data
* @ap: ATA interface
@@ -88,7 +90,10 @@
static void atiixp_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
+ unsigned long flags;
+ spin_lock_irqsave(&atiixp_lock, flags);
atiixp_set_pio_timing(ap, adev, adev->pio_mode - XFER_PIO_0);
+ spin_unlock_irqrestore(&atiixp_lock, flags);
}
/**
@@ -108,6 +113,9 @@
int dma = adev->dma_mode;
int dn = 2 * ap->port_no + adev->devno;
int wanted_pio;
+ unsigned long flags;
+
+ spin_lock_irqsave(&atiixp_lock, flags);
if (adev->dma_mode >= XFER_UDMA_0) {
u16 udma_mode_data;
@@ -145,6 +153,7 @@
if (adev->pio_mode != wanted_pio)
atiixp_set_pio_timing(ap, adev, wanted_pio);
+ spin_unlock_irqrestore(&atiixp_lock, flags);
}
/**