From: Johannes Berg <johannes.berg@intel.com> stable inclusion from stable-5.10.67 commit 608c8359c567b4a04dedbe121d711b51797e390e bugzilla: 182619 https://gitee.com/openeuler/kernel/issues/I4EWO7 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ Upstream commit 6ac5720086c8b176794eb74c5cc09f8b79017f38 ] When switching op-modes, or more generally when reconfiguring, we might switch the RB size. In _iwl_pcie_rx_init() we have a comment saying we must free all RBs since we might switch the size, but this is actually too late: the switch has been done and we'll free the buffers with the wrong size. Fix this by always freeing the buffers, if any, at the start of configure, instead of only after the size may have changed. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Luca Coelho <luciano.coelho@intel.com> Link: https://lore.kernel.org/r/iwlwifi.20210802170640.42d7c93279c4.I07f74e65aab0e... Signed-off-by: Luca Coelho <luciano.coelho@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Chen Jun <chenjun102@huawei.com> Acked-by: Weilong Chen <chenweilong@huawei.com> Signed-off-by: Chen Jun <chenjun102@huawei.com> --- drivers/net/wireless/intel/iwlwifi/pcie/rx.c | 5 ++++- drivers/net/wireless/intel/iwlwifi/pcie/trans.c | 3 +++ 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c index 94299f259518..2c13fa8f2820 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c @@ -544,6 +544,9 @@ void iwl_pcie_free_rbs_pool(struct iwl_trans *trans) struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); int i; + if (!trans_pcie->rx_pool) + return; + for (i = 0; i < RX_POOL_SIZE(trans_pcie->num_rx_bufs); i++) { if (!trans_pcie->rx_pool[i].page) continue; @@ -1094,7 +1097,7 @@ static int _iwl_pcie_rx_init(struct iwl_trans *trans) INIT_LIST_HEAD(&rba->rbd_empty); spin_unlock(&rba->lock); - /* free all first - we might be reconfigured for a different size */ + /* free all first - we overwrite everything here */ iwl_pcie_free_rbs_pool(trans); for (i = 0; i < RX_QUEUE_SIZE; i++) diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c index bb990be7c870..082768ec8aa8 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c @@ -1909,6 +1909,9 @@ static void iwl_trans_pcie_configure(struct iwl_trans *trans, { struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); + /* free all first - we might be reconfigured for a different size */ + iwl_pcie_free_rbs_pool(trans); + trans->txqs.cmd.q_id = trans_cfg->cmd_queue; trans->txqs.cmd.fifo = trans_cfg->cmd_fifo; trans->txqs.cmd.wdg_timeout = trans_cfg->cmd_q_wdg_timeout; -- 2.20.1