From: Johannes Berg <johannes.b...@intel.com> [ Upstream commit 7a21b1d4a728a483f07c638ccd8610d4b4f12684 ]
If we get into a problem severe enough to attempt a reprobe, we schedule a worker to do that. However, if the problem gets more severe and the device is actually destroyed before this worker has a chance to run, we use a free device. Bump up the reference count of the device until the worker runs to avoid this situation. Signed-off-by: Johannes Berg <johannes.b...@intel.com> Signed-off-by: Luca Coelho <luciano.coe...@intel.com> Signed-off-by: Kalle Valo <kv...@codeaurora.org> Link: https://lore.kernel.org/r/iwlwifi.20210122144849.871f0892e4b2.I94819e11afd68d875f3e242b98bef724b8236f1e@changeid Signed-off-by: Sasha Levin <sas...@kernel.org> --- drivers/net/wireless/intel/iwlwifi/mvm/ops.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c index cea8e397fe0f2..cb83490f1016f 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c @@ -1249,6 +1249,7 @@ static void iwl_mvm_reprobe_wk(struct work_struct *wk) reprobe = container_of(wk, struct iwl_mvm_reprobe, work); if (device_reprobe(reprobe->dev)) dev_err(reprobe->dev, "reprobe failed!\n"); + put_device(reprobe->dev); kfree(reprobe); module_put(THIS_MODULE); } @@ -1299,7 +1300,7 @@ void iwl_mvm_nic_restart(struct iwl_mvm *mvm, bool fw_error) module_put(THIS_MODULE); return; } - reprobe->dev = mvm->trans->dev; + reprobe->dev = get_device(mvm->trans->dev); INIT_WORK(&reprobe->work, iwl_mvm_reprobe_wk); schedule_work(&reprobe->work); } else if (test_bit(IWL_MVM_STATUS_HW_RESTART_REQUESTED, -- 2.27.0
