[PATCH 1/7] hp-wmi: check query return value in hp_wmi_perform_query

[Anssi Hannula]

---
 drivers/platform/x86/hp-wmi.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/drivers/platform/x86/hp-wmi.c b/drivers/platform/x86/hp-wmi.c
index 9e05af9..87dfb24 100644
--- a/drivers/platform/x86/hp-wmi.c
+++ b/drivers/platform/x86/hp-wmi.c
@@ -89,6 +89,13 @@ struct bios_return {
        u32 value;
 };
 
+enum hp_return_value {
+       HPWMI_RET_WRONG_SIGNATURE       = 0x02,
+       HPWMI_RET_UNKNOWN_COMMAND       = 0x03,
+       HPWMI_RET_UNKNOWN_CMDTYPE       = 0x04,
+       HPWMI_RET_INVALID_PARAMETERS    = 0x05,
+};
+
 static const struct key_entry hp_wmi_keymap[] = {
        { KE_KEY, 0x02,   { KEY_BRIGHTNESSUP } },
        { KE_KEY, 0x03,   { KEY_BRIGHTNESSDOWN } },
@@ -171,6 +178,15 @@ static int hp_wmi_perform_query(int query, int write, u32 
*buffer,
 
        bios_return = *((struct bios_return *)obj->buffer.pointer);
 
+       if (bios_return.return_code) {
+               if (bios_return.return_code != HPWMI_RET_UNKNOWN_CMDTYPE)
+                       printk(KERN_WARNING PREFIX "query 0x%x returned "
+                                                  "error 0x%x\n",
+                              query, bios_return.return_code);
+               kfree(obj);
+               return bios_return.return_code;
+       }
+
        memcpy(buffer, &bios_return.value, sizeof(bios_return.value));
 
        kfree(obj);
-- 
1.7.3

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