linux-kernel - Re: PROBLEM: 5.3.0-rc* causes iwlwifi failure

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Message-ID: <20190820233734.GA1406@chirva-slack.chirva-slack>
Date:   Tue, 20 Aug 2019 19:37:34 -0400
From:   Stuart Little <achirvasub@...il.com>
To:     Luciano Coelho <luciano.coelho@...el.com>
Cc:     Serge Belyshev <belyshev@...ni.sinp.msu.ru>,
        Johannes Berg <johannes.berg@...el.com>,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        kernel list <linux-kernel@...r.kernel.org>,
        Intel Linux Wireless <linuxwifi@...el.com>,
        linux-wireless@...r.kernel.org,
        Haim Dreyfuss <haim.dreyfuss@...el.com>
Subject: Re: PROBLEM: 5.3.0-rc* causes iwlwifi failure

On Tue, Aug 20, 2019 at 01:45:37PM +0300, Luciano Coelho wrote:
> I'll have to look into all NIC/FW-version combinations that we have and
> update the iwl_mvm_sar_geo_support() function accordingly, which is,
> BTW, the easier place for you to change if you want to workaround the
> issue.

Thanks!

I didn't quite know how to interpret this suggestion (i.e. what the change should be), so I was poking around in there out of curiosity. One simple-minded thing that worked was to just pretend that that function always returns false:

--- cut here ---

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
index 5de54d1559dd..8c0160e5588f 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
@@ -925,7 +925,7 @@ int iwl_mvm_get_sar_geo_profile(struct iwl_mvm *mvm)
                .data = { data },
        };
 
-       if (!iwl_mvm_sar_geo_support(mvm))
+       /*if (!iwl_mvm_sar_geo_support(mvm))*/
                return -EOPNOTSUPP;
 
        ret = iwl_mvm_send_cmd(mvm, &cmd);
@@ -953,7 +953,7 @@ static int iwl_mvm_sar_geo_init(struct iwl_mvm *mvm)
        int ret, i, j;
        u16 cmd_wide_id =  WIDE_ID(PHY_OPS_GROUP, GEO_TX_POWER_LIMIT);
 
-       if (!iwl_mvm_sar_geo_support(mvm))
+       /*if (!iwl_mvm_sar_geo_support(mvm))*/
                return 0;
 
        ret = iwl_mvm_sar_get_wgds_table(mvm);

--- cut here ---