From f0fea2b728af737ec45d96a0279087a558ad9774 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Wed, 31 May 2017 13:19:10 +0200 Subject: [PATCH] iwlwifi: pcie: warn if paging is already initialized during init This appears to happen in some cases, like when iwlmvm is unloaded and loaded again without also unloading iwlwifi. Warn in this case and free the paging data to be able to continue without causing corruption and kernel crashes due to it (otherwise, paging data is overwritten, but dram->paging_cnt gets to be twice as big as it should be, and then an eventual free will crash.) Signed-off-by: Johannes Berg Signed-off-by: Luca Coelho --- drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info.c b/drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info.c index 00d1a5f048b3..eddaca76d514 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info.c @@ -137,6 +137,11 @@ static int iwl_pcie_ctxt_info_init_fw_sec(struct iwl_trans *trans, struct iwl_context_info_dram *ctxt_dram = &ctxt_info->dram; int i, ret, lmac_cnt, umac_cnt, paging_cnt; + if (WARN(dram->paging, + "paging shouldn't already be initialized (%d pages)\n", + dram->paging_cnt)) + iwl_pcie_ctxt_info_free_paging(trans); + lmac_cnt = iwl_pcie_get_num_sections(fw, 0); /* add 1 due to separator */ umac_cnt = iwl_pcie_get_num_sections(fw, lmac_cnt + 1); -- 2.20.1