From: Zhang Rui <rui.zhang@intel.com>
Date: Thu, 20 Mar 2008 08:40:32 +0000 (+0800)
Subject: ACPI: fix a regression of ACPI device driver autoloading
X-Git-Tag: v2.6.25-rc8~75^2~1^5
X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=5c9fcb5deef4d3a49798d76c48b726d2e3c7df72;p=linux-2.6-omap-h63xx.git

ACPI: fix a regression of ACPI device driver autoloading

commit 3620f2f2f39e7870cf1a4fb2e34063a142f28716 sets the cid of
ACPI video/dock/bay device and leaves the hid empty.
As a result, "modalias" should export the cid for
devices which don't have a hid.

ACPI Video driver is not autoloaded with
commit 3620f2f2f39e7870cf1a4fb2e34063a142f28716 applied.
"cat /sys/.../device:03(acpi video bus)/modalias" shows nothing.

ACPI Video driver is autoloaded after revert that commit.
"cat /sys/.../LNXVIDEO:0x/modalias" shows "acpi:LNXVIDEO:"

ACPI Video driver is autoloaded with commit
3620f2f2f39e7870cf1a4fb2e34063a142f28716 and this patch applied.
"cat /sys/.../device:03(acpi video bus)/modalias"
shows "acpi:LNXVIDEO:"

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
---

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 57570ac4780..e6ce262b5d4 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -39,20 +39,26 @@ static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
 			   int size)
 {
 	int len;
+	int count;
 
-	if (!acpi_dev->flags.hardware_id)
+	if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
 		return -ENODEV;
 
-	len = snprintf(modalias, size, "acpi:%s:",
-		       acpi_dev->pnp.hardware_id);
-	if (len < 0 || len >= size)
-		return -EINVAL;
+	len = snprintf(modalias, size, "acpi:");
 	size -= len;
 
+	if (acpi_dev->flags.hardware_id) {
+		count = snprintf(&modalias[len], size, "%s:",
+				 acpi_dev->pnp.hardware_id);
+		if (count < 0 || count >= size)
+			return -EINVAL;
+		len += count;
+		size -= count;
+	}
+
 	if (acpi_dev->flags.compatible_ids) {
 		struct acpi_compatible_id_list *cid_list;
 		int i;
-		int count;
 
 		cid_list = acpi_dev->pnp.cid_list;
 		for (i = 0; i < cid_list->count; i++) {