* [PATCH] mt76: usb: do not build the skb if reported len does not fit in buf_size
[not found] <cover.1543672649.git.lorenzo.bianconi@redhat.com>
@ 2018-12-01 14:01 ` Lorenzo Bianconi
2018-12-28 12:16 ` Felix Fietkau
0 siblings, 1 reply; 2+ messages in thread
From: Lorenzo Bianconi @ 2018-12-01 14:01 UTC (permalink / raw)
To: nbd; +Cc: linux-wireless
Precompute data length in order to avoid to allocate the related
skb data structure if reported length does not fit in queue buf_size
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
---
drivers/net/wireless/mediatek/mt76/usb.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/drivers/net/wireless/mediatek/mt76/usb.c b/drivers/net/wireless/mediatek/mt76/usb.c
index b061263453d4..14ff06c5764e 100644
--- a/drivers/net/wireless/mediatek/mt76/usb.c
+++ b/drivers/net/wireless/mediatek/mt76/usb.c
@@ -407,17 +407,15 @@ mt76u_process_rx_entry(struct mt76_dev *dev, struct urb *urb)
if (len < 0)
return 0;
+ data_len = min_t(int, len, urb->sg[0].length - MT_DMA_HDR_LEN);
+ if (MT_DMA_HDR_LEN + data_len > SKB_WITH_OVERHEAD(q->buf_size))
+ return 0;
+
skb = build_skb(data, q->buf_size);
if (!skb)
return 0;
- data_len = min_t(int, len, urb->sg[0].length - MT_DMA_HDR_LEN);
skb_reserve(skb, MT_DMA_HDR_LEN);
- if (skb->tail + data_len > skb->end) {
- dev_kfree_skb(skb);
- return 1;
- }
-
__skb_put(skb, data_len);
len -= data_len;
--
2.19.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] mt76: usb: do not build the skb if reported len does not fit in buf_size
2018-12-01 14:01 ` [PATCH] mt76: usb: do not build the skb if reported len does not fit in buf_size Lorenzo Bianconi
@ 2018-12-28 12:16 ` Felix Fietkau
0 siblings, 0 replies; 2+ messages in thread
From: Felix Fietkau @ 2018-12-28 12:16 UTC (permalink / raw)
To: Lorenzo Bianconi; +Cc: linux-wireless
On 2018-12-01 15:01, Lorenzo Bianconi wrote:
> Precompute data length in order to avoid to allocate the related
> skb data structure if reported length does not fit in queue buf_size
>
> Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Applied, thanks.
- Felix
^ permalink raw reply [flat|nested] 2+ messages in thread
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2018-12-01 14:01 ` [PATCH] mt76: usb: do not build the skb if reported len does not fit in buf_size Lorenzo Bianconi
2018-12-28 12:16 ` Felix Fietkau
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