@@ -474,36 +474,37 @@ static int wcn36xx_rx_handle_packets(struct wcn36xx *wcn,
struct wcn36xx_dxe_desc *dxe = ctl->desc;
dma_addr_t dma_addr;
struct sk_buff *skb;
+ int ret = 0, int_mask;
+ u32 value;
+
+ if (ch->ch_type == WCN36XX_DXE_CH_RX_L) {
+ value = WCN36XX_DXE_CTRL_RX_L;
+ int_mask = WCN36XX_DXE_INT_CH1_MASK;
+ } else {
+ value = WCN36XX_DXE_CTRL_RX_H;
+ int_mask = WCN36XX_DXE_INT_CH3_MASK;
+ }
while (!(dxe->ctrl & WCN36XX_DXE_CTRL_VALID_MASK)) {
skb = ctl->skb;
dma_addr = dxe->dst_addr_l;
- wcn36xx_dxe_fill_skb(wcn->dev, ctl);
-
- switch (ch->ch_type) {
- case WCN36XX_DXE_CH_RX_L:
- dxe->ctrl = WCN36XX_DXE_CTRL_RX_L;
- wcn36xx_dxe_write_register(wcn, WCN36XX_DXE_ENCH_ADDR,
- WCN36XX_DXE_INT_CH1_MASK);
- break;
- case WCN36XX_DXE_CH_RX_H:
- dxe->ctrl = WCN36XX_DXE_CTRL_RX_H;
- wcn36xx_dxe_write_register(wcn, WCN36XX_DXE_ENCH_ADDR,
- WCN36XX_DXE_INT_CH3_MASK);
- break;
- default:
- wcn36xx_warn("Unknown channel\n");
- }
-
- dma_unmap_single(wcn->dev, dma_addr, WCN36XX_PKT_SIZE,
- DMA_FROM_DEVICE);
- wcn36xx_rx_skb(wcn, skb);
+ ret = wcn36xx_dxe_fill_skb(wcn->dev, ctl);
+ if (0 == ret) {
+ /* new skb allocation ok. Use the new one and queue
+ * the old one to network system.
+ */
+ dma_unmap_single(wcn->dev, dma_addr, WCN36XX_PKT_SIZE,
+ DMA_FROM_DEVICE);
+ wcn36xx_rx_skb(wcn, skb);
+ } /* else keep old skb not submitted and use it for rx DMA */
+
+ wcn36xx_dxe_write_register(wcn, WCN36XX_DXE_ENCH_ADDR, int_mask);
+ dxe->ctrl = value;
ctl = ctl->next;
dxe = ctl->desc;
}
ch->head_blk_ctl = ctl;
-
return 0;
}
Lawrence reported that git clone could make system crash on a Qualcomm ARM soc based device (DragonBoard, 1G memory without swap) running 64bit Debian. It's turned out the crash is related with rx skb allocation failure. git could consume more than 600MB anonymous memory. And system is in extremely memory shortage case. But driver didn't handle the rx allocation failure case. This patch doesn't submit skb to upper layer if rx skb allocation fails. Instead, it reuse the old skb for rx DMA again. It's more like drop the packets if system is in memory shortage case. With this change, git clone is OOMed instead of system crash. Reported-by: King, Lawrence <lking@qti.qualcomm.com> Signed-off-by: Fengwei Yin <fengwei.yin@linaro.org> --- drivers/net/wireless/ath/wcn36xx/dxe.c | 43 +++++++++++++++++----------------- 1 file changed, 22 insertions(+), 21 deletions(-) -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html