[PATCH AUTOSEL 5.0 182/262] iwlwifi: mvm: fix RFH config command with >=10 CPUs

Sasha Levin
2019-03-27T18:07:56Z

From: Johannes Berg <johannes.berg@intel.com>

[ Upstream commit dbf592f3d14fb7d532cb7c820b1065cf33e02aaa ]

If we have >=10 (logical) CPUs, our command size exceeds the
internal buffer size and the command fails; fix that by using
IWL_HCMD_DFL_NOCOPY for the command that's allocated anyway.

While at it, also fix the leak of cmd, and use struct_size()
to calculate its size.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Fixes: 8edbfaa19835 ("iwlwifi: mvm: configure multi RX queue")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/intel/iwlwifi/mvm/fw.c | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
index 0d6c313b6669..19ec55cef802 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
@@ -127,13 +127,17 @@ static int iwl_send_rss_cfg_cmd(struct iwl_mvm *mvm)

static int iwl_configure_rxq(struct iwl_mvm *mvm)
{
- int i, num_queues, size;
+ int i, num_queues, size, ret;
struct iwl_rfh_queue_config *cmd;
+ struct iwl_host_cmd hcmd = {
+ .id = WIDE_ID(DATA_PATH_GROUP, RFH_QUEUE_CONFIG_CMD),
+ .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
+ };

/* Do not configure default queue, it is configured via context info */
num_queues = mvm->trans->num_rx_queues - 1;

- size = sizeof(*cmd) + num_queues * sizeof(struct iwl_rfh_queue_data);
+ size = struct_size(cmd, data, num_queues);

cmd = kzalloc(size, GFP_KERNEL);
if (!cmd)
@@ -154,10 +158,14 @@ static int iwl_configure_rxq(struct iwl_mvm *mvm)
cmd->data[i].fr_bd_wid = cpu_to_le32(data.fr_bd_wid);
}

- return iwl_mvm_send_cmd_pdu(mvm,
- WIDE_ID(DATA_PATH_GROUP,
- RFH_QUEUE_CONFIG_CMD),
- 0, size, cmd);
+ hcmd.data[0] = cmd;
+ hcmd.len[0] = size;
+
+ ret = iwl_mvm_send_cmd(mvm, &hcmd);
+
+ kfree(cmd);
+
+ return ret;
}

static int iwl_mvm_send_dqa_cmd(struct iwl_mvm *mvm)
--
2.19.1