nathan/Chromebook-Device-Nyan-NVIDIA-Tegra-K1-T124-Upstream-Linux-3.10-LTS-Kernel
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Updated from Linux LTS 3.10.22 to 3.10.23

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Nathan
2025-04-09 17:19:07 -05:00
parent 74577147bc
commit 943c6a9f68
64 changed files with 510 additions and 466 deletions
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10
drivers/net/tun.c
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@@ -1069,6 +1069,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
struct sk_buff *skb;
size_t len = total_len, align = NET_SKB_PAD, linear;
struct virtio_net_hdr gso = { 0 };
int good_linear;
int offset = 0;
int copylen;
bool zerocopy = false;
@@ -1109,12 +1110,16 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
return -EINVAL;
}
good_linear = SKB_MAX_HEAD(align);
if (msg_control) {
/* There are 256 bytes to be copied in skb, so there is
* enough room for skb expand head in case it is used.
* The rest of the buffer is mapped from userspace.
*/
copylen = gso.hdr_len ? gso.hdr_len : GOODCOPY_LEN;
if (copylen > good_linear)
copylen = good_linear;
linear = copylen;
if (iov_pages(iv, offset + copylen, count) <= MAX_SKB_FRAGS)
zerocopy = true;
@@ -1122,7 +1127,10 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
if (!zerocopy) {
copylen = len;
linear = gso.hdr_len;
if (gso.hdr_len > good_linear)
linear = good_linear;
else
linear = gso.hdr_len;
}
skb = tun_alloc_skb(tfile, align, copylen, linear, noblock);