Subject: ACPI: Avoid twice read access to EC data I/O port
>From : Zhao Yakui <yakui.zhao@xxxxxxxxx>
In current kernel when OS reads the data returned by the EC controller, the
EC data I/O port is accessed twice. In fact is is meaningless.
Only once access to EC data I/O port is enough to get data returned by EC
controller.
Signed-off-by : Zhao Yakui <yakui.zhao@xxxxxxxxx>
Acked-by : Alexey Starikovskiy <astarikovskiy@xxxxxxx>
---
drivers/acpi/ec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Index: linux-2.6/drivers/acpi/ec.c
===================================================================
--- linux-2.6.orig/drivers/acpi/ec.c
+++ linux-2.6/drivers/acpi/ec.c
@@ -150,7 +150,7 @@ static inline u8 acpi_ec_read_data(struc
{
u8 x = inb(ec->data_addr);
pr_debug(PREFIX "---> data = 0x%2.2x\n", x);
- return inb(ec->data_addr);
+ return x;
}
static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)
--
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