Source of vringh.c - linux-imx - PHYTEC BitBucket (Stash)

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    struct kvec *new;
    unsigned int flag, new_num = (iov->max_num & ~VRINGH_IOV_ALLOCATED) * 2;
​
    if (new_num < 8)
        new_num = 8;
​
    flag = (iov->max_num & VRINGH_IOV_ALLOCATED);
    if (flag)
        new = krealloc(iov->iov, new_num * sizeof(struct iovec), gfp);
    else {
        new = kmalloc(new_num * sizeof(struct iovec), gfp);
        new = kmalloc_array(new_num, sizeof(struct iovec), gfp);
        if (new) {
            memcpy(new, iov->iov,
                   iov->max_num * sizeof(struct iovec));
            flag = VRINGH_IOV_ALLOCATED;
        }
    }
    if (!new)
        return -ENOMEM;
    iov->iov = new;
    iov->max_num = (new_num | flag);