[PATCH AUTOSEL for 4.9 133/293] iwlwifi: mvm: reset the fw_dump_desc pointer after ASSERT

From: Sasha Levin
Date: Sun Apr 08 2018 - 22:18:14 EST


From: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>

[ Upstream commit a509a248bb31ea013c4c2b6801297a2d82eecd43 ]

When we get an ASSERT, the fw_dump_desc pointer points to
iwl_mvm_dump_desc_assert which can't be freed since it is
a global. We still need to NULL'ify the pointer when we
call iwl_mvm_free_fw_dump_desc otherwise we will hit

int iwl_mvm_fw_dbg_collect_desc(struct iwl_mvm *mvm,
const struct iwl_mvm_dump_desc *desc,
const struct iwl_fw_dbg_trigger_tlv *trigger)
{
<snip>
if (WARN_ON(mvm->fw_dump_desc))
iwl_mvm_free_fw_dump_desc(mvm);

Fixes: b6eaa45aa18b ("iwlwifi: mvm: add the cause of the firmware dump in the dump")
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
Signed-off-by: Luca Coelho <luciano.coelho@xxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
---
drivers/net/wireless/intel/iwlwifi/mvm/fw-dbg.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw-dbg.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw-dbg.c
index 700d244df34b..bec32cd0be76 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/fw-dbg.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw-dbg.c
@@ -331,10 +331,8 @@ static void iwl_mvm_dump_fifos(struct iwl_mvm *mvm,

void iwl_mvm_free_fw_dump_desc(struct iwl_mvm *mvm)
{
- if (mvm->fw_dump_desc == &iwl_mvm_dump_desc_assert)
- return;
-
- kfree(mvm->fw_dump_desc);
+ if (mvm->fw_dump_desc != &iwl_mvm_dump_desc_assert)
+ kfree(mvm->fw_dump_desc);
mvm->fw_dump_desc = NULL;
}

--
2.15.1