mwifiex: scan command preparation failure handling

Commit Message

Bing Zhao March 20, 2014, 11:23 p.m. UTC

From: Amitkumar Karwar <[e-mail]>

When scan request is received, scan commands are prepared and
queued into scan pending queue. There is a corner case when
command nodes are full. So we stop queueing further scan
commands and return an error. This patch makes sure that
currently queued commands in scan pending queue are also freed
in this case.

Signed-off-by: Amitkumar Karwar <[e-mail]>
Signed-off-by: Bing Zhao <[e-mail]>
---
 drivers/net/wireless/mwifiex/scan.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

Patch

diff --git a/drivers/net/wireless/mwifiex/scan.c b/drivers/net/wireless/mwifiex/scan.c
index f139244..a5ecd83 100644
--- a/drivers/net/wireless/mwifiex/scan.c
+++ b/drivers/net/wireless/mwifiex/scan.c
@@ -591,9 +591,12 @@  mwifiex_scan_channel_list(struct mwifiex_private *priv,
 			  *chan_tlv_out,
 			  struct mwifiex_chan_scan_param_set *scan_chan_list)
 {
+	struct mwifiex_adapter *adapter = priv->adapter;
 	int ret = 0;
 	struct mwifiex_chan_scan_param_set *tmp_chan_list;
 	struct mwifiex_chan_scan_param_set *start_chan;
+	struct cmd_ctrl_node *cmd_node, *tmp_node;
+	unsigned long flags;
 
 	u32 tlv_idx, rates_size, cmd_no;
 	u32 total_scan_time;
@@ -748,8 +751,19 @@  mwifiex_scan_channel_list(struct mwifiex_private *priv,
 		scan_cfg_out->tlv_buf_len -=
 			    sizeof(struct mwifiex_ie_types_header) + rates_size;
 
-		if (ret)
+		if (ret) {
+			spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
+			list_for_each_entry_safe(cmd_node, tmp_node,
+						 &adapter->scan_pending_q,
+						 list) {
+				list_del(&cmd_node->list);
+				cmd_node->wait_q_enabled = false;
+				mwifiex_insert_cmd_to_free_q(adapter, cmd_node);
+			}
+			spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
+					       flags);
 			break;
+		}
 	}
 
 	if (ret)