From a9e12869758430424804dd4332e0d2afdfdf00b0 Mon Sep 17 00:00:00 2001 From: Larry Finger Date: Thu, 19 May 2011 10:17:04 -0500 Subject: rtlwifi: Fix kernel panic resulting from RX buffer allocation failure To handle amsdu_8k capability, the PCI routine of this driver must allocate receive buffers of order 2. Under heavy load, this causes fragmentation of memory. The present code releases the current buffer before checking to see if a new one is availble. Recovery from allocation failures is not possible, which results in kernel panics. The fix is to reorder the code to check that a new buffer can be allocated before the old one is released. If not possible, the received frame is dropped and the old one is reused. Without this change, it is impossible to transfer a 2 GB file without a kernel panic. Signed-off-by: Larry Finger Cc: Stable [2.6.{37,38,39}] Signed-off-by: John W. Linville --- drivers/net/wireless/rtlwifi/pci.c | 28 +++++++++++++++------------- 1 file changed, 15 insertions(+), 13 deletions(-) (limited to 'drivers/net/wireless/rtlwifi/pci.c') diff --git a/drivers/net/wireless/rtlwifi/pci.c b/drivers/net/wireless/rtlwifi/pci.c index a4095284543..c2b83a57c58 100644 --- a/drivers/net/wireless/rtlwifi/pci.c +++ b/drivers/net/wireless/rtlwifi/pci.c @@ -669,11 +669,6 @@ static void _rtl_pci_rx_interrupt(struct ieee80211_hw *hw) &rx_status, (u8 *) pdesc, skb); - pci_unmap_single(rtlpci->pdev, - *((dma_addr_t *) skb->cb), - rtlpci->rxbuffersize, - PCI_DMA_FROMDEVICE); - skb_put(skb, rtlpriv->cfg->ops->get_desc((u8 *) pdesc, false, HW_DESC_RXPKT_LEN)); @@ -690,6 +685,21 @@ static void _rtl_pci_rx_interrupt(struct ieee80211_hw *hw) hdr = rtl_get_hdr(skb); fc = rtl_get_fc(skb); + /* try for new buffer - if allocation fails, drop + * frame and reuse old buffer + */ + new_skb = dev_alloc_skb(rtlpci->rxbuffersize); + if (unlikely(!new_skb)) { + RT_TRACE(rtlpriv, (COMP_INTR | COMP_RECV), + DBG_DMESG, + ("can't alloc skb for rx\n")); + goto done; + } + pci_unmap_single(rtlpci->pdev, + *((dma_addr_t *) skb->cb), + rtlpci->rxbuffersize, + PCI_DMA_FROMDEVICE); + if (!stats.crc || !stats.hwerror) { memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status)); @@ -758,15 +768,7 @@ static void _rtl_pci_rx_interrupt(struct ieee80211_hw *hw) rtl_lps_leave(hw); } - new_skb = dev_alloc_skb(rtlpci->rxbuffersize); - if (unlikely(!new_skb)) { - RT_TRACE(rtlpriv, (COMP_INTR | COMP_RECV), - DBG_DMESG, - ("can't alloc skb for rx\n")); - goto done; - } skb = new_skb; - /*skb->dev = dev; */ rtlpci->rx_ring[rx_queue_idx].rx_buf[rtlpci-> rx_ring -- cgit v1.2.3 From 0019a2c9277bf6d083032a5a9857249e75407a8c Mon Sep 17 00:00:00 2001 From: Larry Finger Date: Thu, 19 May 2011 11:48:45 -0500 Subject: rtlwifi: Use order 2 RX buffer allocation only if necessary Although a previous fix handles the kernel panics that result from failure to allocate a new RX buffer, memory fragmentation can be reduced if the amsdu_8k capability is disabled as new buffers need only be of O(0), not O(2). Signed-off-by: Larry Finger Signed-off-by: John W. Linville --- drivers/net/wireless/rtlwifi/pci.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'drivers/net/wireless/rtlwifi/pci.c') diff --git a/drivers/net/wireless/rtlwifi/pci.c b/drivers/net/wireless/rtlwifi/pci.c index c2b83a57c58..89100e7c553 100644 --- a/drivers/net/wireless/rtlwifi/pci.c +++ b/drivers/net/wireless/rtlwifi/pci.c @@ -1115,6 +1115,13 @@ static int _rtl_pci_init_rx_ring(struct ieee80211_hw *hw) rtlpci->rx_ring[rx_queue_idx].idx = 0; + /* If amsdu_8k is disabled, set buffersize to 4096. This + * change will reduce memory fragmentation. + */ + if (rtlpci->rxbuffersize > 4096 && + rtlpriv->rtlhal.disable_amsdu_8k) + rtlpci->rxbuffersize = 4096; + for (i = 0; i < rtlpci->rxringcount; i++) { struct sk_buff *skb = dev_alloc_skb(rtlpci->rxbuffersize); -- cgit v1.2.3