From: Zhao Yakui <yakui.zhao@intel.com>
Date: Thu, 15 Nov 2007 09:01:06 +0000 (+0800)
Subject: ACPI: Handle I/O access width requestst that are not a multiple of 8 bits.
X-Git-Tag: v2.6.24-rc4~107^2~4^2~5
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=49fbabf56dc715bbb51e59742e82ba762790aac0;p=linux-2.6

ACPI: Handle I/O access width requestst that are not a multiple of 8 bits.

We've run into BIOS that hand us 4-bit access width requests
for T-state control when the code expected only multipls of 8-bits.
Round up.

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Li Shaohua <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index aabc6ca4a8..e3a673a008 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -387,17 +387,14 @@ acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 	if (!value)
 		value = &dummy;
 
-	switch (width) {
-	case 8:
+	*value = 0;
+	if (width <= 8) {
 		*(u8 *) value = inb(port);
-		break;
-	case 16:
+	} else if (width <= 16) {
 		*(u16 *) value = inw(port);
-		break;
-	case 32:
+	} else if (width <= 32) {
 		*(u32 *) value = inl(port);
-		break;
-	default:
+	} else {
 		BUG();
 	}
 
@@ -408,17 +405,13 @@ EXPORT_SYMBOL(acpi_os_read_port);
 
 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 {
-	switch (width) {
-	case 8:
+	if (width <= 8) {
 		outb(value, port);
-		break;
-	case 16:
+	} else if (width <= 16) {
 		outw(value, port);
-		break;
-	case 32:
+	} else if (width <= 32) {
 		outl(value, port);
-		break;
-	default:
+	} else {
 		BUG();
 	}