Re: [PATCH] iwlagn: check for !priv->txq iniwlagn_wait_tx_queue_empty

[Guy, Wey-Yi]

On Mon, 2011-07-25 at 12:38 -0700, Keith Packard wrote:
> If the interface is down, txq is NULL. iwlagn_wait_tx_queue_empty
> needs to check for this case to avoid dereferencing that pointer.
> 
> Signed-off-by: Keith Packard <keithp@xxxxxxxxxx>
> ---
> 
> This is on top of v3.0
> 
>  drivers/net/wireless/iwlwifi/iwl-agn-lib.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
> index f803fb6..d6ae444 100644
> --- a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
> +++ b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
> @@ -1487,6 +1487,9 @@ int iwlagn_wait_tx_queue_empty(struct iwl_priv *priv)
>  	unsigned long now = jiffies;
>  	int ret = 0;
>  
> +	if (!priv->txq)
> +		return 0;
> +
>  	/* waiting for all the tx frames complete might take a while */
>  	for (cnt = 0; cnt < priv->hw_params.max_txq_num; cnt++) {
>  		if (cnt == priv->cmd_queue)

but why you need it?, "start device" call will fail if can not allocate
priv->txq

Thanks
Wey

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