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iwl3945: fix lock dependency 

Patch seperates rx_used and rx_free into two
different atomic contexts. We can now avoid using GFP_ATOMIC
for skb allocation and use GFP_KERNEL.

Signed-off-by: Abhijeet Kolekar <abhijeet.kolekar@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Abhijeet Kolekar 2009-04-30 13:56:26 -07:00 committed by John W. Linville
parent 84379cba44
commit 722404983b
1 changed files with 17 additions and 20 deletions
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37
drivers/net/wireless/iwlwifi/iwl3945-base.c
View File

@ -1344,15 +1344,24 @@ static void iwl3945_rx_allocate(struct iwl_priv *priv)
struct list_head *element;
struct iwl_rx_mem_buffer *rxb;
unsigned long flags;
spin_lock_irqsave(&rxq->lock, flags);
while (!list_empty(&rxq->rx_used)) {
while (1) {
spin_lock_irqsave(&rxq->lock, flags);
if (list_empty(&rxq->rx_used)) {
spin_unlock_irqrestore(&rxq->lock, flags);
return;
}
element = rxq->rx_used.next;
rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
list_del(element);
spin_unlock_irqrestore(&rxq->lock, flags);
/* Alloc a new receive buffer */
rxb->skb =
alloc_skb(priv->hw_params.rx_buf_size,
__GFP_NOWARN | GFP_ATOMIC);
GFP_KERNEL);
if (!rxb->skb) {
if (net_ratelimit())
IWL_CRIT(priv, ": Can not allocate SKB buffers\n");
@ -1370,18 +1379,18 @@ static void iwl3945_rx_allocate(struct iwl_priv *priv)
*/
skb_reserve(rxb->skb, 4);
priv->alloc_rxb_skb++;
list_del(element);
/* Get physical address of RB/SKB */
rxb->real_dma_addr = pci_map_single(priv->pci_dev,
rxb->skb->data,
priv->hw_params.rx_buf_size,
PCI_DMA_FROMDEVICE);
spin_lock_irqsave(&rxq->lock, flags);
list_add_tail(&rxb->list, &rxq->rx_free);
priv->alloc_rxb_skb++;
rxq->free_count++;
spin_unlock_irqrestore(&rxq->lock, flags);
}
spin_unlock_irqrestore(&rxq->lock, flags);
}
void iwl3945_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
@ -1414,18 +1423,6 @@ void iwl3945_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
spin_unlock_irqrestore(&rxq->lock, flags);
}
/*
* this should be called while priv->lock is locked
*/
static void __iwl3945_rx_replenish(void *data)
{
struct iwl_priv *priv = data;
iwl3945_rx_allocate(priv);
iwl3945_rx_queue_restock(priv);
}
void iwl3945_rx_replenish(void *data)
{
struct iwl_priv *priv = data;
@ -1644,7 +1641,7 @@ static void iwl3945_rx_handle(struct iwl_priv *priv)
count++;
if (count >= 8) {
priv->rxq.read = i;
__iwl3945_rx_replenish(priv);
iwl3945_rx_queue_restock(priv);
count = 0;
}
}