zhhyu7 commented on code in PR #8811:
URL: https://github.com/apache/nuttx/pull/8811#discussion_r1136481062
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drivers/net/tun.c:
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@@ -986,6 +988,7 @@ static ssize_t tun_write(FAR struct file *filep, FAR const
char *buffer,
{
net_lock();
ret = netdev_iob_prepare(&priv->dev, false, 0);
+ priv->dev.d_buf = NULL;
Review Comment:
> why this is needed?
netdev_iob_prepare will set dev.d_buf = dev.d_iob->io_data, there will be
problems the next devif_poll.
dev.d_buf should be NULL when offload case. this operation simply reset the
dev.d_buf to previous value.
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