From b697b5372ecfe0c57ee26e0c3787fc2306109228 Mon Sep 17 00:00:00 2001 From: Karol Kozimor Date: Thu, 22 Dec 2005 12:42:00 -0500 Subject: [PATCH] [ASUS_ACPI] work around Samsung P30s oops The code used to rely on a certain method to return a NULL buffer, which is now hardly possible with the implicit return code on by default. This sort of fixes bugs #5067 and #5092 for now. Note: this patch makes the driver unusable on said machines (and on said machines only) iff acpi=strict is specified, but it seems noone really uses that. Signed-off-by: Karol Kozimor Signed-off-by: Len Brown --- drivers/acpi/asus_acpi.c | 27 ++++++++++++++++++--------- 1 file changed, 18 insertions(+), 9 deletions(-) diff --git a/drivers/acpi/asus_acpi.c b/drivers/acpi/asus_acpi.c index fec895af6ae..582995ef9f3 100644 --- a/drivers/acpi/asus_acpi.c +++ b/drivers/acpi/asus_acpi.c @@ -987,9 +987,21 @@ static int __init asus_hotk_get_info(void) printk(KERN_NOTICE " BSTS called, 0x%02x returned\n", bsts_result); - /* Samsung P30 has a device with a valid _HID whose INIT does not - * return anything. Catch this one and any similar here */ - if (buffer.pointer == NULL) { + /* This is unlikely with implicit return */ + if (buffer.pointer == NULL) + return -EINVAL; + + model = (union acpi_object *) buffer.pointer; + /* + * Samsung P30 has a device with a valid _HID whose INIT does not + * return anything. It used to be possible to catch this exception, + * but the implicit return code will now happily confuse the + * driver. We assume that every ACPI_TYPE_STRING is a valid model + * identifier but it's still possible to get completely bogus data. + */ + if (model->type == ACPI_TYPE_STRING) { + printk(KERN_NOTICE " %s model detected, ", model->string.pointer); + } else { if (asus_info && /* Samsung P30 */ strncmp(asus_info->oem_table_id, "ODEM", 4) == 0) { hotk->model = P30; @@ -1002,13 +1014,10 @@ static int __init asus_hotk_get_info(void) "the developers with your DSDT\n"); } hotk->methods = &model_conf[hotk->model]; - return AE_OK; - } + + acpi_os_free(model); - model = (union acpi_object *)buffer.pointer; - if (model->type == ACPI_TYPE_STRING) { - printk(KERN_NOTICE " %s model detected, ", - model->string.pointer); + return AE_OK; } hotk->model = END_MODEL; -- 2.39.5