[PATCH v4 4/4] platform/x86: hp-bioscfg: warn on element type mismatch instead of failing

[Muhammad Bilal]

hp_populate_enumeration_elements_from_package() returns -EIO and aborts
enumeration of the entire attribute when any single element has an
unexpected ACPI type. This is observed on HP EliteBook 840 G2 when the
BIOS returns malformed ACPI data following a failed WMI query:

  ACPI BIOS Error (bug): AE_AML_BUFFER_LIMIT, Index (0x000000032)
    is beyond end of object (length 0x32)
  ACPI Error: Aborting method \_SB.WMID.WQBE due to previous error
  Error expected type 2 for elem 13, but got type 1 instead
  hp_bioscfg: Returned error 0x3,
    "Invalid command value/Feature not supported"

Aborting immediately discards the attribute entirely.

Warn about the unexpected element type, free the temporary string, skip
the offending element, and continue parsing the remaining package
instead of failing the whole attribute.

Fixes: a34fc329b189 ("platform/x86: hp-bioscfg: bioscfg")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Muhammad Bilal <meatuni001@xxxxxxxxx>
---
 drivers/platform/x86/hp/hp-bioscfg/enum-attributes.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/hp/hp-bioscfg/enum-attributes.c b/drivers/platform/x86/hp/hp-bioscfg/enum-attributes.c
index 3aa2c440e0528..b834303e5bc79 100644
--- a/drivers/platform/x86/hp/hp-bioscfg/enum-attributes.c
+++ b/drivers/platform/x86/hp/hp-bioscfg/enum-attributes.c
@@ -163,10 +163,11 @@ static int hp_populate_enumeration_elements_from_package(union acpi_object *enum
 
 		/* Check that both expected and read object type match */
 		if (expected_enum_types[eloc] != enum_obj[elem].type) {
-			pr_err("Error expected type %d for elem %d, but got type %d instead\n",
-			       expected_enum_types[eloc], elem, enum_obj[elem].type);
+			pr_warn("Unexpected element type at elem %d: expected %d, got %d, skipping\n",
+				elem, expected_enum_types[eloc], enum_obj[elem].type);
 			kfree(str_value);
-			return -EIO;
+			str_value = NULL;
+			continue;
 		}
 
 		/* Assign appropriate element value to corresponding field */
-- 
2.55.0