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ACPI: fix a regression of ACPI device driver autoloading 

commit 3620f2f2f3 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 3620f2f2f3 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
3620f2f2f3 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>
This commit is contained in:
Zhang Rui 2008-03-20 16:40:32 +08:00 committed by Len Brown
parent a4083c9271
commit 5c9fcb5dee
1 changed files with 12 additions and 6 deletions
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18
drivers/acpi/scan.c
View File

@ -39,20 +39,26 @@ static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
int size) int size)
{ {
int len; int len;
int count;
if (!acpi_dev->flags.hardware_id) if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
return -ENODEV; return -ENODEV;
len = snprintf(modalias, size, "acpi:%s:", len = snprintf(modalias, size, "acpi:");
acpi_dev->pnp.hardware_id);
if (len < 0 || len >= size)
return -EINVAL;
size -= len; 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) { if (acpi_dev->flags.compatible_ids) {
struct acpi_compatible_id_list *cid_list; struct acpi_compatible_id_list *cid_list;
int i; int i;
int count;
cid_list = acpi_dev->pnp.cid_list; cid_list = acpi_dev->pnp.cid_list;
for (i = 0; i < cid_list->count; i++) { for (i = 0; i < cid_list->count; i++) {