This is a note to let you know that I've just added the patch titled
iwlwifi: mvm: avoid dumping assert log when device is stopped
to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: iwlwifi-mvm-avoid-dumping-assert-log-when-device-is-stopped.patch and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Fri Mar 16 15:11:07 CET 2018
From: Sara Sharon sara.sharon@intel.com Date: Mon, 20 Nov 2017 18:02:05 +0200 Subject: iwlwifi: mvm: avoid dumping assert log when device is stopped
From: Sara Sharon sara.sharon@intel.com
[ Upstream commit 6362ab721ef5c4ecfa01f53ad4137d3d984f0c6c ]
We might erroneously get to error dumping code when the device is already stopped.
In that case the driver will detect a defective value and will try to reset the HW, assuming it is only a bus issue. The driver than proceeds with the dumping.
The result has two side effects:
1. The device won't be stopped again, since the transport status is already stopped, so the device remains powered on while it actually should be stopped.
2. The dump in that case is completely garbaged and useless.
Detect and avoid this. It will also make debugging such issues easier.
Signed-off-by: Sara Sharon sara.sharon@intel.com Signed-off-by: Luca Coelho luciano.coelho@intel.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/wireless/intel/iwlwifi/mvm/utils.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/utils.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/utils.c @@ -595,6 +595,12 @@ static void iwl_mvm_dump_lmac_error_log(
void iwl_mvm_dump_nic_error_log(struct iwl_mvm *mvm) { + if (!test_bit(STATUS_DEVICE_ENABLED, &mvm->trans->status)) { + IWL_ERR(mvm, + "DEVICE_ENABLED bit is not set. Aborting dump.\n"); + return; + } + iwl_mvm_dump_lmac_error_log(mvm, mvm->error_event_table[0]);
if (mvm->error_event_table[1])
Patches currently in stable-queue which might be from sara.sharon@intel.com are
queue-4.15/iwlwifi-mvm-avoid-dumping-assert-log-when-device-is-stopped.patch