iwlcore: Allow skb allocation from tasklet.
If RX queue becomes empty then we need to restock the queue from tasklet to prevent
ucode from starving. A caller to iwl_rx_allocate will decide if allocated buffer should
come from GFP_ATOMIC or GFP_KERNEL.
Signed-off-by: Mohamed Abbas <mohamed.abbas@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index fa24b01..be1058b 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -831,6 +831,7 @@
unsigned long flags;
u8 fill_rx = 0;
u32 count = 8;
+ int total_empty;
/* uCode's read index (stored in shared DRAM) indicates the last Rx
* buffer that the driver may process (last buffer filled by ucode). */
@@ -841,7 +842,12 @@
if (i == r)
IWL_DEBUG_RX(priv, "r = %d, i = %d\n", r, i);
- if (iwl_rx_queue_space(rxq) > (RX_QUEUE_SIZE / 2))
+ /* calculate total frames need to be restock after handling RX */
+ total_empty = r - priv->rxq.write_actual;
+ if (total_empty < 0)
+ total_empty += RX_QUEUE_SIZE;
+
+ if (total_empty > (RX_QUEUE_SIZE / 2))
fill_rx = 1;
while (i != r) {
@@ -918,7 +924,7 @@
count++;
if (count >= 8) {
priv->rxq.read = i;
- iwl_rx_queue_restock(priv);
+ iwl_rx_replenish_now(priv);
count = 0;
}
}
@@ -926,7 +932,10 @@
/* Backtrack one entry */
priv->rxq.read = i;
- iwl_rx_queue_restock(priv);
+ if (fill_rx)
+ iwl_rx_replenish_now(priv);
+ else
+ iwl_rx_queue_restock(priv);
}
/* call this function to flush any scheduled tasklet */