Messages in this thread Patch in this message | | | Date | Fri, 06 Nov 2009 14:15:29 -0800 | From | Greg KH <> | Subject | [91/99] iwlwifi: reduce noise when skb allocation fails |
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2.6.31-stable review patch. If anyone has any objections, please let us know.
------------------ From: Reinette Chatre <reinette.chatre@intel.com>
commit f82a924cc88a5541df1d4b9d38a0968cd077a051 upstream.
Replenishment of receive buffers is done in the tasklet handling received frames as well as in a workqueue. When we are in the tasklet we cannot sleep and thus attempt atomic skb allocations. It is generally not a big problem if this fails since iwl_rx_allocate is always followed by a call to iwl_rx_queue_restock which will queue the work to replenish the buffers at a time when sleeping is allowed.
We thus add the __GFP_NOWARN to the skb allocation in iwl_rx_allocate to reduce the noise if such an allocation fails while we still have enough buffers. We do maintain the warning and the error message when we are low on buffers to communicate to the user that there is a potential problem with memory availability on system
This addresses issue reported upstream in thread "iwlagn: order 2 page allocation failures" in http://thread.gmane.org/gmane.linux.kernel.wireless.general/39187
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- drivers/net/wireless/iwlwifi/iwl-rx.c | 10 +++++++++- drivers/net/wireless/iwlwifi/iwl3945-base.c | 9 ++++++++- 2 files changed, 17 insertions(+), 2 deletions(-)
--- a/drivers/net/wireless/iwlwifi/iwl3945-base.c +++ b/drivers/net/wireless/iwlwifi/iwl3945-base.c @@ -1208,11 +1208,18 @@ static void iwl3945_rx_allocate(struct i } spin_unlock_irqrestore(&rxq->lock, flags); + if (rxq->free_count > RX_LOW_WATERMARK) + priority |= __GFP_NOWARN; /* Alloc a new receive buffer */ skb = alloc_skb(priv->hw_params.rx_buf_size, priority); if (!skb) { if (net_ratelimit()) - IWL_CRIT(priv, ": Can not allocate SKB buffers\n"); + IWL_DEBUG_INFO(priv, "Failed to allocate SKB buffer.\n"); + if ((rxq->free_count <= RX_LOW_WATERMARK) && + net_ratelimit()) + IWL_CRIT(priv, "Failed to allocate SKB buffer with %s. Only %u free buffers remaining.\n", + priority == GFP_ATOMIC ? "GFP_ATOMIC" : "GFP_KERNEL", + rxq->free_count); /* We don't reschedule replenish work here -- we will * call the restock method and if it still needs * more buffers it will schedule replenish */ --- a/drivers/net/wireless/iwlwifi/iwl-rx.c +++ b/drivers/net/wireless/iwlwifi/iwl-rx.c @@ -250,12 +250,20 @@ void iwl_rx_allocate(struct iwl_priv *pr } spin_unlock_irqrestore(&rxq->lock, flags); + if (rxq->free_count > RX_LOW_WATERMARK) + priority |= __GFP_NOWARN; /* Alloc a new receive buffer */ skb = alloc_skb(priv->hw_params.rx_buf_size + 256, priority); if (!skb) { - IWL_CRIT(priv, "Can not allocate SKB buffers\n"); + if (net_ratelimit()) + IWL_DEBUG_INFO(priv, "Failed to allocate SKB buffer.\n"); + if ((rxq->free_count <= RX_LOW_WATERMARK) && + net_ratelimit()) + IWL_CRIT(priv, "Failed to allocate SKB buffer with %s. Only %u free buffers remaining.\n", + priority == GFP_ATOMIC ? "GFP_ATOMIC" : "GFP_KERNEL", + rxq->free_count); /* We don't reschedule replenish work here -- we will * call the restock method and if it still needs * more buffers it will schedule replenish */
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