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From: Luca Coelho <luca@coelho.fi>
To: torvalds@linux-foundation.org, johannes@sipsolutions.net,
	kuba@kernel.org
Cc: kvalo@codeaurora.org, davem@davemloft.net,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	gregkh@linuxfoundation.org, miriam.rachel.korenblitz@intel.com
Subject: [PATCH] iwlwifi: mvm: add rtnl_lock() in iwl_mvm_start_get_nvm()
Date: Thu,  2 Sep 2021 13:11:01 +0300	[thread overview]
Message-ID: <20210902101101.383243-1-luca@coelho.fi> (raw)
In-Reply-To: <635201a071bb6940ac9c1f381efef6abeed13f70.camel@intel.com>

From: Luca Coelho <luciano.coelho@intel.com>

Due to a rebase damage, we lost the rtnl_lock() when the patch was
sent out.  This causes an RTNL imbalance and failed assertions, due to
missing RTNL protection, for instance:

  RTNL: assertion failed at net/wireless/reg.c (4025)
  WARNING: CPU: 60 PID: 1720 at net/wireless/reg.c:4025 regulatory_set_wiphy_regd_sync+0x7f/0x90 [cfg80211]
  Call Trace:
   iwl_mvm_init_mcc+0x170/0x190 [iwlmvm]
   iwl_op_mode_mvm_start+0x824/0xa60 [iwlmvm]
   iwl_opmode_register+0xd0/0x130 [iwlwifi]
   init_module+0x23/0x1000 [iwlmvm]

Fix this by adding the missing rtnl_lock() back to the code.

Fixes: eb09ae93dabf ("iwlwifi: mvm: load regdomain at INIT stage")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/ops.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
index 6f60018feed1..77ea2d0a3091 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
@@ -686,6 +686,7 @@ static int iwl_mvm_start_get_nvm(struct iwl_mvm *mvm)
 {
 	int ret;
 
+	rtnl_lock();
 	mutex_lock(&mvm->mutex);
 
 	ret = iwl_run_init_mvm_ucode(mvm);
-- 
2.33.0


  reply	other threads:[~2021-09-02 10:49 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-31 20:37 [GIT PULL] Networking for v5.15 Jakub Kicinski
2021-08-31 23:56 ` pr-tracker-bot
2021-09-01 19:00 ` Linus Torvalds
2021-09-01 19:41   ` Jakub Kicinski
2021-09-01 19:49     ` Johannes Berg
2021-09-01 21:48       ` Larry Finger
2021-09-02  9:33       ` Coelho, Luciano
2021-09-02 10:11         ` Luca Coelho [this message]
2021-09-02 10:39           ` [PATCH] iwlwifi: mvm: add rtnl_lock() in iwl_mvm_start_get_nvm() David Miller
2021-09-02 15:55             ` Linus Torvalds
     [not found]         ` <CAP71bdV1eBm3f1qY0rfigK4VaW5icZ+hU0pw7g6fVM=hGbn7Xw@mail.gmail.com>
2021-09-02 17:16           ` [GIT PULL] Networking for v5.15 Linus Torvalds
2021-09-02  5:55     ` Larry Finger
2021-09-02  7:07       ` Johannes Berg
2021-09-02  0:02 ` John Stultz
2021-09-02  9:25   ` Dan Carpenter
2021-09-02  9:28     ` Srinivas Kandagatla
2021-09-02 10:08       ` [PATCH net] net: qrtr: revert check in qrtr_endpoint_post() Dan Carpenter
2021-09-02 10:40         ` patchwork-bot+netdevbpf
2021-09-04  3:08     ` [GIT PULL] Networking for v5.15 John Stultz

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