iwlagn: remove most BUG_ON instances

There are a number of things in the driver that
may result in a BUG(), which is suboptimal since
it's hard to get debugging information out of
the driver in that case and the user experience
is also not good :-)

Almost all BUG_ON instances can be converted to
WARN_ON with a few lines of appropriate error
handling, so do that instead.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

1 files changed, 17 insertions, 8 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-tx.c b/drivers/net/wireless/iwlwifi/iwl-tx.c
index 3732380c4ffe..e7faba57b6e3 100644
--- a/drivers/net/wireless/iwlwifi/iwl-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-tx.c
@@ -263,11 +263,13 @@ static int iwl_queue_init(struct iwl_priv *priv, struct iwl_queue *q,
 
         /* count must be power-of-two size, otherwise iwl_queue_inc_wrap
          * and iwl_queue_dec_wrap are broken. */
-        BUG_ON(!is_power_of_2(count));
+        if (WARN_ON(!is_power_of_2(count)))
+                return -EINVAL;
 
         /* slots_num must be power-of-two size, otherwise
          * get_cmd_index is broken. */
-        BUG_ON(!is_power_of_2(slots_num));
+        if (WARN_ON(!is_power_of_2(slots_num)))
+                return -EINVAL;
 
         q->low_mark = q->n_window / 4;
         if (q->low_mark < 4)
@@ -384,7 +386,9 @@ int iwl_tx_queue_init(struct iwl_priv *priv, struct iwl_tx_queue *txq,
         BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1));
 
         /* Initialize queue's high/low-water marks, and head/tail indexes */
-        iwl_queue_init(priv, &txq->q, TFD_QUEUE_SIZE_MAX, slots_num, txq_id);
+        ret = iwl_queue_init(priv, &txq->q, TFD_QUEUE_SIZE_MAX, slots_num, txq_id);
+        if (ret)
+                return ret;
 
         /* Tell device where to find queue */
         priv->cfg->ops->lib->txq_init(priv, txq);
@@ -446,14 +450,19 @@ int iwl_enqueue_hcmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
         cmd->len = priv->cfg->ops->utils->get_hcmd_size(cmd->id, cmd->len);
         fix_size = (u16)(cmd->len + sizeof(out_cmd->hdr));
 
-        /* If any of the command structures end up being larger than
+        /*
+         * If any of the command structures end up being larger than
          * the TFD_MAX_PAYLOAD_SIZE, and it sent as a 'small' command then
          * we will need to increase the size of the TFD entries
          * Also, check to see if command buffer should not exceed the size
-         * of device_cmd and max_cmd_size. */
-        BUG_ON((fix_size > TFD_MAX_PAYLOAD_SIZE) &&
-               !(cmd->flags & CMD_SIZE_HUGE));
-        BUG_ON(fix_size > IWL_MAX_CMD_SIZE);
+         * of device_cmd and max_cmd_size.
+         */
+        if (WARN_ON((fix_size > TFD_MAX_PAYLOAD_SIZE) &&
+                    !(cmd->flags & CMD_SIZE_HUGE)))
+                return -EINVAL;
+
+        if (WARN_ON(fix_size > IWL_MAX_CMD_SIZE))
+                return -EINVAL;
 
         if (iwl_is_rfkill(priv) || iwl_is_ctkill(priv)) {
                 IWL_WARN(priv, "Not sending command - %s KILL\n",