[PATCH 5.18 720/879] iwlwifi: fw: init SAR GEO table only if data is present

[Greg Kroah-Hartman]

From: Johannes Berg <johannes.berg@xxxxxxxxx>

commit d1f6530c3e373ddd7c76b05646052a27eead14ad upstream.

When no table data was read from ACPI, then filling the data
and returning success here will fill zero values, which means
transmit power will be limited to 0 dBm. This is clearly not
intended.

Return an error from iwl_sar_geo_init() if there's no data to
fill into the command structure.

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Fixes: 78a19d5285d9 ("iwlwifi: mvm: Read the PPAG and SAR tables at INIT stage")
Signed-off-by: Gregory Greenman <gregory.greenman@xxxxxxxxx>
Link: https://lore.kernel.org/r/20220517120044.bc45923b74e9.Id2b4362234b7f8ced82c591b95d4075dd2ec12f4@changeid
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/wireless/intel/iwlwifi/fw/acpi.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/wireless/intel/iwlwifi/fw/acpi.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/acpi.c
@@ -937,6 +937,9 @@ int iwl_sar_geo_init(struct iwl_fw_runti
 {
 	int i, j;
 
+	if (!fwrt->geo_enabled)
+		return -ENODATA;
+
 	if (!iwl_sar_geo_support(fwrt))
 		return -EOPNOTSUPP;