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| author | Johannes Berg <johannes.berg@intel.com> | 2011-06-27 06:06:42 -0700 |
|---|---|---|
| committer | Wey-Yi Guy <wey-yi.w.guy@intel.com> | 2011-07-01 07:46:21 -0700 |
| commit | 98a648e10a3c4eb30f8043281345506e17ace007 (patch) | |
| tree | 0e1f04eb63b342018635f0bb38860e13cedaaa7d | |
| parent | 9a4ba833a2d0016cf836827e136f0c219834bd41 (diff) | |
| download | linux-98a648e10a3c4eb30f8043281345506e17ace007.tar.gz linux-98a648e10a3c4eb30f8043281345506e17ace007.tar.bz2 linux-98a648e10a3c4eb30f8043281345506e17ace007.zip | |
iwlagn: verify mutex held for sync commands
Emmanuel noticed that there's no explicit checking
that prevents the driver from attempting to issue
multiple synchronous commands at the same time and
wrote a patch to check. However, his patch warns
only if a collision actually happened, an unlikely
thing since the driver mutex should be held for
synchronous command submissions.
So instead of checking that a collision happened
add a check that the mutex is held which ensures
that collisions can't happen.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
| -rw-r--r-- | drivers/net/wireless/iwlwifi/iwl-dev.h | 1 | ||||
| -rw-r--r-- | drivers/net/wireless/iwlwifi/iwl-hcmd.c | 13 |
2 files changed, 3 insertions, 11 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h index 8ec04f20c96a..ae2ecc24b91e 100644 --- a/drivers/net/wireless/iwlwifi/iwl-dev.h +++ b/drivers/net/wireless/iwlwifi/iwl-dev.h @@ -1301,7 +1301,6 @@ struct iwl_priv { /* command queue number */ u8 cmd_queue; - u8 last_sync_cmd_id; /* max number of station keys */ u8 sta_key_max_num; diff --git a/drivers/net/wireless/iwlwifi/iwl-hcmd.c b/drivers/net/wireless/iwlwifi/iwl-hcmd.c index e3e5fb614178..107b38e2ee93 100644 --- a/drivers/net/wireless/iwlwifi/iwl-hcmd.c +++ b/drivers/net/wireless/iwlwifi/iwl-hcmd.c @@ -171,6 +171,8 @@ int iwl_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd) int cmd_idx; int ret; + lockdep_assert_held(&priv->mutex); + if (WARN_ON(cmd->flags & CMD_ASYNC)) return -EINVAL; @@ -181,16 +183,7 @@ int iwl_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd) IWL_DEBUG_INFO(priv, "Attempting to send sync command %s\n", get_cmd_string(cmd->id)); - if (test_and_set_bit(STATUS_HCMD_ACTIVE, &priv->status)) { - IWL_ERR(priv, "STATUS_HCMD_ACTIVE already set while sending %s" - ". Previous SYNC cmdn is %s\n", - get_cmd_string(cmd->id), - get_cmd_string(priv->last_sync_cmd_id)); - WARN_ON(1); - } else { - priv->last_sync_cmd_id = cmd->id; - } - + set_bit(STATUS_HCMD_ACTIVE, &priv->status); IWL_DEBUG_INFO(priv, "Setting HCMD_ACTIVE for command %s\n", get_cmd_string(cmd->id)); |