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path: root/drivers/net/can/cc770/cc770_isa.c
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Diffstat (limited to 'drivers/net/can/cc770/cc770_isa.c')
-rw-r--r--drivers/net/can/cc770/cc770_isa.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/net/can/cc770/cc770_isa.c b/drivers/net/can/cc770/cc770_isa.c
index 4be5fe2..9f3a25c 100644
--- a/drivers/net/can/cc770/cc770_isa.c
+++ b/drivers/net/can/cc770/cc770_isa.c
@@ -110,6 +110,11 @@ MODULE_PARM_DESC(bcr, "Bus configuration register (default=0x40 [CBY])");
#define CC770_IOSIZE 0x20
#define CC770_IOSIZE_INDIRECT 0x02
+/* Spinlock for cc770_isa_port_write_reg_indirect
+ * and cc770_isa_port_read_reg_indirect
+ */
+static DEFINE_SPINLOCK(cc770_isa_port_lock);
+
static struct platform_device *cc770_isa_devs[MAXDEV];
static u8 cc770_isa_mem_read_reg(const struct cc770_priv *priv, int reg)
@@ -138,18 +143,27 @@ static u8 cc770_isa_port_read_reg_indirect(const struct cc770_priv *priv,
int reg)
{
unsigned long base = (unsigned long)priv->reg_base;
+ unsigned long flags;
+ u8 val;
+ spin_lock_irqsave(&cc770_isa_port_lock, flags);
outb(reg, base);
- return inb(base + 1);
+ val = inb(base + 1);
+ spin_unlock_irqrestore(&cc770_isa_port_lock, flags);
+
+ return val;
}
static void cc770_isa_port_write_reg_indirect(const struct cc770_priv *priv,
int reg, u8 val)
{
unsigned long base = (unsigned long)priv->reg_base;
+ unsigned long flags;
+ spin_lock_irqsave(&cc770_isa_port_lock, flags);
outb(reg, base);
outb(val, base + 1);
+ spin_unlock_irqrestore(&cc770_isa_port_lock, flags);
}
static int __devinit cc770_isa_probe(struct platform_device *pdev)
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