diff mbox series

[for,-next] iwlwifi: pcie: don't enable BHs with IRQs disabled

Message ID iwlwifi.20210415164821.d0f2edda1651.I75f762e0bed38914d1300ea198b86dd449b4b206@changeid
State New
Headers show
Series [for,-next] iwlwifi: pcie: don't enable BHs with IRQs disabled | expand

Commit Message

Luca Coelho April 15, 2021, 1:48 p.m. UTC
From: Johannes Berg <johannes.berg@intel.com>

After the fix from Jiri that disabled local IRQs instead of
just BHs (necessary to fix an issue with submitting a command
with IRQs already disabled), there was still a situation in
which we could deep in there enable BHs, if the device config
sets the apmg_wake_up_wa configuration, which is true on all
7000 series devices.

To fix that, but not require reverting commit 1ed08f6fb5ae
("iwlwifi: remove flags argument for nic_access"), split up
nic access into a version with BH manipulation to use most
of the time, and without it for this specific case where the
local IRQs are already disabled.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 .../wireless/intel/iwlwifi/pcie/internal.h    |  5 ++++
 .../net/wireless/intel/iwlwifi/pcie/trans.c   | 24 ++++++++++++++++---
 drivers/net/wireless/intel/iwlwifi/pcie/tx.c  |  4 ++--
 3 files changed, 28 insertions(+), 5 deletions(-)

Comments

Kalle Valo April 15, 2021, 4:04 p.m. UTC | #1
Luca Coelho <luca@coelho.fi> writes:

> On Thu, 2021-04-15 at 16:48 +0300, Luca Coelho wrote:
>> From: Johannes Berg <johannes.berg@intel.com>
>> 
>> After the fix from Jiri that disabled local IRQs instead of
>> just BHs (necessary to fix an issue with submitting a command
>> with IRQs already disabled), there was still a situation in
>> which we could deep in there enable BHs, if the device config
>> sets the apmg_wake_up_wa configuration, which is true on all
>> 7000 series devices.
>> 
>> To fix that, but not require reverting commit 1ed08f6fb5ae
>> ("iwlwifi: remove flags argument for nic_access"), split up
>> nic access into a version with BH manipulation to use most
>> of the time, and without it for this specific case where the
>> local IRQs are already disabled.
>> 
>> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
>> Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
>> ---
>
> Kalle, I'm going to assign this one to you too, but this time for -next
> and not for -fixes.
>
> This is related to the fix Jiri made, but to avoid some conflicts and a
> broken v5.13-rc, we want to get it into v5.13 if still possible.
>
> So can you please take this on top of my latest pull request?
> Additionally, can you tag it for stable?

Will do.
Kalle Valo April 18, 2021, 6:38 a.m. UTC | #2
Luca Coelho <luca@coelho.fi> wrote:

> From: Johannes Berg <johannes.berg@intel.com>

> 

> After the fix from Jiri that disabled local IRQs instead of

> just BHs (necessary to fix an issue with submitting a command

> with IRQs already disabled), there was still a situation in

> which we could deep in there enable BHs, if the device config

> sets the apmg_wake_up_wa configuration, which is true on all

> 7000 series devices.

> 

> To fix that, but not require reverting commit 1ed08f6fb5ae

> ("iwlwifi: remove flags argument for nic_access"), split up

> nic access into a version with BH manipulation to use most

> of the time, and without it for this specific case where the

> local IRQs are already disabled.

> 

> Signed-off-by: Johannes Berg <johannes.berg@intel.com>

> Signed-off-by: Luca Coelho <luciano.coelho@intel.com>


Patch applied to wireless-drivers-next.git, thanks.

c544d89b0d67 iwlwifi: pcie: don't enable BHs with IRQs disabled

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/iwlwifi.20210415164821.d0f2edda1651.I75f762e0bed38914d1300ea198b86dd449b4b206@changeid/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
diff mbox series

Patch

diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/internal.h b/drivers/net/wireless/intel/iwlwifi/pcie/internal.h
index d9688c7bed07..76a512cd2e5c 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/internal.h
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/internal.h
@@ -447,6 +447,11 @@  struct iwl_trans
 		      const struct iwl_cfg_trans_params *cfg_trans);
 void iwl_trans_pcie_free(struct iwl_trans *trans);
 
+bool __iwl_trans_pcie_grab_nic_access(struct iwl_trans *trans);
+#define _iwl_trans_pcie_grab_nic_access(trans)			\
+	__cond_lock(nic_access_nobh,				\
+		    likely(__iwl_trans_pcie_grab_nic_access(trans)))
+
 /*****************************************************
 * RX
 ******************************************************/
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
index 861dbc03d183..239bc177a3e5 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
@@ -1978,12 +1978,16 @@  static void iwl_trans_pcie_removal_wk(struct work_struct *wk)
 	module_put(THIS_MODULE);
 }
 
-static bool iwl_trans_pcie_grab_nic_access(struct iwl_trans *trans)
+/*
+ * This version doesn't disable BHs but rather assumes they're
+ * already disabled.
+ */
+bool __iwl_trans_pcie_grab_nic_access(struct iwl_trans *trans)
 {
 	int ret;
 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 
-	spin_lock_bh(&trans_pcie->reg_lock);
+	spin_lock(&trans_pcie->reg_lock);
 
 	if (trans_pcie->cmd_hold_nic_awake)
 		goto out;
@@ -2068,7 +2072,7 @@  static bool iwl_trans_pcie_grab_nic_access(struct iwl_trans *trans)
 		}
 
 err:
-		spin_unlock_bh(&trans_pcie->reg_lock);
+		spin_unlock(&trans_pcie->reg_lock);
 		return false;
 	}
 
@@ -2081,6 +2085,20 @@  static bool iwl_trans_pcie_grab_nic_access(struct iwl_trans *trans)
 	return true;
 }
 
+static bool iwl_trans_pcie_grab_nic_access(struct iwl_trans *trans)
+{
+	bool ret;
+
+	local_bh_disable();
+	ret = __iwl_trans_pcie_grab_nic_access(trans);
+	if (ret) {
+		/* keep BHs disabled until iwl_trans_pcie_release_nic_access */
+		return ret;
+	}
+	local_bh_enable();
+	return false;
+}
+
 static void iwl_trans_pcie_release_nic_access(struct iwl_trans *trans)
 {
 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/tx.c b/drivers/net/wireless/intel/iwlwifi/pcie/tx.c
index 0346505351f5..4f6c187eed69 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/tx.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/tx.c
@@ -643,7 +643,7 @@  static int iwl_pcie_set_cmd_in_flight(struct iwl_trans *trans,
 	 * returned. This needs to be done only on NICs that have
 	 * apmg_wake_up_wa set (see above.)
 	 */
-	if (!iwl_trans_grab_nic_access(trans))
+	if (!_iwl_trans_pcie_grab_nic_access(trans))
 		return -EIO;
 
 	/*
@@ -652,7 +652,7 @@  static int iwl_pcie_set_cmd_in_flight(struct iwl_trans *trans,
 	 * already true, so it's OK to unconditionally set it to true.
 	 */
 	trans_pcie->cmd_hold_nic_awake = true;
-	spin_unlock_bh(&trans_pcie->reg_lock);
+	spin_unlock(&trans_pcie->reg_lock);
 
 	return 0;
 }