From nobody Sun Mar 19 15:34:21 2023 X-Original-To: freebsd-current@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4PfhkJ4wbCz40LJ8 for ; Sun, 19 Mar 2023 15:34:32 +0000 (UTC) (envelope-from kevans@freebsd.org) Received: from smtp.freebsd.org (smtp.freebsd.org [96.47.72.83]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "smtp.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4PfhkJ4Tg3z4Mbm for ; Sun, 19 Mar 2023 15:34:32 +0000 (UTC) (envelope-from kevans@freebsd.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1679240072; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+kRA5PSF89Tu1a2svZedhKHy8MrYwMY7rDx89hYCTG0=; b=auKarkCV6WKwCsolRcykNksdkWYOW0/jKoBWu97p3fAy953CXC9arhxTrzACv8Jifma/WW AZ+ybWcWhkd0cfavTRX7IfH6t2YeaLur6ibvVjGM8wov1L6dZlhD+NgqmjKwqvdf/IPbnj 6eEeWey+YUvowF+cFQoDGAH7VGPSqWvCL/qEHiDHhyKk4NDsp/OIlZzQ06SuD+dZfdoqOl MB2LNoQDVFa5tBqvJprwoyLH02/L+jxWMzzgLQZsi2S/T8Sn6gh1dwGVO1NN4R9Gnz3p+E t+Npv6ekqQInkwuvu4Bti2YOaJMdyHLWoUsXVgN9A23bJfJsIgnnVQyaUJzbAw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1679240072; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+kRA5PSF89Tu1a2svZedhKHy8MrYwMY7rDx89hYCTG0=; b=w+V6A/O89iagObLZKEJX1gh1ro9mOC/C1n56epf3usrkTqERAuW/ncocnZ9EzNpKToLXGI icGQwOyskhW2/DaZC0cC4FwwpdPvwnurV9eLqpi3BiuP9e1elo1GCQtlAYseqtw2yloYn0 tm29XWk1iMsEn0AD3zrEe2ur6Le9P4CB6PY8bvjO9J1JWmdHu7ol/3dGb9QOsvLhwh8nta bws+DKyimJWmZxyWPAmckgTVFJZ7W5bw5Iw5xj5iGgmxv9i6oAYDJm6VMUBg/84dfGozVt 51vW6KryYGOaeE3MIPU7sJZVVruSqozn4DchiBt6Qdoj7TBEez5X6TkymarVhA== ARC-Authentication-Results: i=1; mx1.freebsd.org; none ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1679240072; a=rsa-sha256; cv=none; b=giDRCfwqxseyavrTBwVTi6X9BA6QjuWEiG0kuWw9VvqRnsZoQzxVgMLelRYKin2RpNkrqc S9rBHOzdfKSSNblwZ4bReZ9VZUQNhZ9n2qkOQ20zRKC0VOdn5v8ITY09R0BbwgJw7ScMp1 cm4TwauGHa5Xe2C3yFaKSttPcfzyQ3vAvxxBB6VmpZtiap8FQLcQN4GTHHH2Lzdz53eyIS M1ankcsLSGVAyEhxxLRGZECPRHLP2CpmozSKEGMWtQCRhRDCZLNw9ryYLpnCg8YDvN3lFx LI3GgKlJtVAhsDHEAmgB5nMQ9PaSmKAe9fR4IXvyL2xktqi8Z90iguPrVEFgtw== Received: from mail-qt1-f179.google.com (mail-qt1-f179.google.com [209.85.160.179]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1D4" (verified OK)) (Authenticated sender: kevans) by smtp.freebsd.org (Postfix) with ESMTPSA id 4PfhkJ3PY5z10XM for ; Sun, 19 Mar 2023 15:34:32 +0000 (UTC) (envelope-from kevans@freebsd.org) Received: by mail-qt1-f179.google.com with SMTP id x1so10578611qtr.7 for ; Sun, 19 Mar 2023 08:34:32 -0700 (PDT) X-Gm-Message-State: AO0yUKWt9T427KHnYQboRhN2dUKgu+15YWsyYyff4PCoXppInzsH5Em+ Z6NIsigbtbjncK4+VRn7DHZ5PseMRAnTbb0dO/Y= X-Google-Smtp-Source: AK7set+6/0OfZZdK6WDLdJeqiNX7yflSlcqF+BRbkzhrTNnOz14UxdIBhP13+rj2dGVOizRLmn2ck/TNjjxNDbQLo1o= X-Received: by 2002:a05:622a:1a95:b0:3d7:9d03:75b0 with SMTP id s21-20020a05622a1a9500b003d79d0375b0mr3797706qtc.13.1679240071975; Sun, 19 Mar 2023 08:34:31 -0700 (PDT) List-Id: Discussions about the use of FreeBSD-current List-Archive: https://lists.freebsd.org/archives/freebsd-current List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-current@freebsd.org MIME-Version: 1.0 References: <20230319111404.a6ac2w44u4trtedy@tilda.center> In-Reply-To: From: Kyle Evans Date: Sun, 19 Mar 2023 10:34:21 -0500 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: Infinite loop with d_write_t To: Yuri Cc: =?UTF-8?B?R29yYW4gTWVracSH?= , freebsd-current@freebsd.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-ThisMailContainsUnwantedMimeParts: N On Sun, Mar 19, 2023 at 6:33=E2=80=AFAM Yuri wrote: > > Goran Meki=C4=87 wrote: > > Hello, > > > > I'm trying to assemble a minimal kernel module and user space program a= s > > a skeleton, and no matter what I do I get infinite loop. The code for > > kernel is https://github.com/mekanix/freebsd-project/blob/master/kernel= /main.c. > > The way to test: > > # make > > # sudo kldload ./hello.ko > > # echo "something" >/dev/hello > > Write done. > > Write done. > > ... > > > > What am I doing wrong and where does that infinite loop comes from? > > Why are you using copyin() and not uiomove() in d_write entry? > > There's an example that looks like you are trying to do: > > https://docs.freebsd.org/en/books/arch-handbook/driverbasics/#driverbasic= s-char > This... d_write/d_read need the uio accounting updated to reflect how much data was written/read, it doesn't want to assume you were able to do everything in a single call. Thanks, Kyle Evans