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Re: [PATCH] Add iwlwifi wireless drivers

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On Wednesday 16 May 2007 17:45, James Ketrenos wrote:
> This patch adds the iwlwifi project directory and sources needed to
> build the mac80211 based wireless drivers for the Intel PRO/Wireless
> 3945ABG/BG Network Connection and Intel Wireless WiFi Link AGN adapters.
>
Looks much better than when I last checked. A few comments:

- The enter/leave stuff should be removed.
- Many of the in_interrupt() checks are unnecessary. Jiri recently documented 
which callbacks need to be atomic - the ones that don't need to be atomic 
definitely won't be called in an interrupt.
- Get rid of the stub functions for callbacks, like set_multicast_list and 
reset. mac80211 checks if those callbacks are defined before calling them.
- CONFIG_IWLWIFI_QOS doesn't appear to be defined.
- Read and set the MAC address before calling ieee80211_register_hw.
- flush_scheduled_work in d_stop can lead to deadlocks since RTNL is held. It 
looks like everything is running on a dedicated workqueue so that doesn't 
really even do anything. priv->workqueue should be flushed instead if needed.
- mac80211 (very recently) sets up a workqueue for the driver to use so you 
don't need to create your own anymore.
- param_auto_create looks very suspicious. mac80211 already creates an adhoc 
station if it can't join one.. what's this for?
- The suspend and resume callback setting in struct pci_driver iwl_driver 
needs to be put on two lines.
- Why are probe requests being dropped in adhoc mode? (assuming hardware 
handles it.. but the message output for that doesn't sound like it)
- The bitwise ORs shouldn't be getting a line to itself in iwl3945_rx_init and 
iwl3945_tx_reset.
- Mixed case variable name in iwl_hw_txq_ctx_stop: queueId.
- CONFIG_IWLWIFI_MONITOR and CONFIG_IEEE80211_RADIOTAP doesn't look right. 
- RX_FLAG_RADIOTAP should be set in the ieee80211_rx_status flag when a 
radiotap header is added to a frame. (otherwise, mac80211 will add its own 
radiotap header)
- If you don't want to add a radiotap header all the time, you should check 
the IEEE80211_CONF_RADIOTAP flag to see if a radiotap header is desired by 
the stack. (not whether or not we're configured as IEEE80211_IF_TYPE_MNTR)
- Splitting rx_start->phy_flags over two lines in iwl4965_rx_reply_rx doesn't 
look good.
- The IEEE80211_FTYPE_MGMT case in the switch statement inside 
iwl4965_rx_reply_rx doesn't need that extra set of braces. Also, the && 
and || don't need their own lines.
- param_channel looks suspicious too.
- ieee80211chan2mhz is provided by ieee80211_radiotap.h.

Haven't seen anything severe enough to be a blocker for wireless-dev, however.

-Michael Wu

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