From owner-freebsd-drivers@freebsd.org Fri Aug 4 01:53:15 2017 Return-Path: Delivered-To: freebsd-drivers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 58E90DBE04E for ; Fri, 4 Aug 2017 01:53:15 +0000 (UTC) (envelope-from khanzf@gmail.com) Received: from mail-pg0-x231.google.com (mail-pg0-x231.google.com [IPv6:2607:f8b0:400e:c05::231]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 2D5907494C for ; Fri, 4 Aug 2017 01:53:15 +0000 (UTC) (envelope-from khanzf@gmail.com) Received: by mail-pg0-x231.google.com with SMTP id u5so1847695pgn.0 for ; Thu, 03 Aug 2017 18:53:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=fM2r41WdSpvx0RXtbz4rLsMFvbZJ1wKcG3YH+oDbUVA=; b=eStwMjuKr0upS88shKZTEJ+YW6UOb2hsEy6NhTKYfbdQ5lVq0tr4lTbTQEnMp1vugB CxlhDF97bgQScFgtZz3Ok3fMygUpYrncjwz8zJL1I4blqbx0G9hC5TVjrPLyFOJMfmrD /sSteqgKnGORDp2Ksj3lpq3K9dOSiBr03oE1cY+PPo7IkdEeE4c5nRpdOI2JP3Iq9Jjm RLsIdKqWH1Cj9/3zQ39R5BAbeQ32oXnXLQswav89wDJPFYkXusrVAIhHGe/PvD1B6lHE hdGdqb9dYRQJIL482JVFF/W6XQqL6ga7p3MZ40xFFF7YSwId7clk0kglkk8BuvNV+39z or0Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=fM2r41WdSpvx0RXtbz4rLsMFvbZJ1wKcG3YH+oDbUVA=; b=OsNtwSkVmUXAJtR/bLL/ejJpMTmkZek3aUVIcYQ8zZWSnl+djg24wiQLZnfaOTYliD +np3W9Fbdcnb2KAryEpxwbX4Lhln3Nlo9/cZJJuhfYNyxUfUXa6lcq5nZWZfORe7O59V nSc0agzKTp3p3HxgnBGPfXdR5HQPemF/cAnoi/EyDNn6Yl0HY4nYUkNSaRzXg3WI37jI 57GpxjtabiVaGmlErdpZrTETPEOeqFguZnIJpsm4/iRcaeCieoYXw9IhAJfyS9qARbQf Fo1FEFx7eT/JFGK1Sw4idmOqXRI3hth4Ogda3JqGFScbS4cM/6OiBHyyBND4+4tQbCSk leWw== X-Gm-Message-State: AIVw110DiwiNoOW7yxmE2Rj0AcDhAoHWzcp38+QeQ06vl69GVHgvrIFW UdG6GZTGskvuoMmGhnDESnNnL5kWmhyYYnU= X-Received: by 10.99.104.129 with SMTP id d123mr700636pgc.236.1501811594611; Thu, 03 Aug 2017 18:53:14 -0700 (PDT) MIME-Version: 1.0 Received: by 10.100.183.208 with HTTP; Thu, 3 Aug 2017 18:52:54 -0700 (PDT) From: Farhan Khan Date: Thu, 3 Aug 2017 21:52:54 -0400 Message-ID: Subject: Driver crash detaches entire PCI bus? To: freebsd-drivers@freebsd.org Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.23 X-BeenThere: freebsd-drivers@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Writing device drivers for FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 04 Aug 2017 01:53:15 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi all, I am trying to write the Realtek 8188e (pci) driver for FreeBSD. I am making slow incremental progress, and having the driver safely exit out (as opposed to a segfault). I noticed that when the device detaches, due to an error in the driver, the entire pci bus will also detach! For example, here is my kernel output: rtwn0: rtwn_load_firmware: failed to upload firmware rtwn-rtl8188eefw (error 60) rtwn0: detached pci2: detached The first line is where the code crashes: sys/dev/rtwn/if_rtwn_fw.c line 129 https://github.com/khanzf/freebsd/blob/103c05369b1ced770a2cadc9468e0134c8d9421b/sys/dev/rtwn/if_rtwn_fw.c#L129 Why would this result in the entire pci2 bus detatching? Strangely enough, I did not have this problem a few months ago, then it suddenly began. This is significantly slowing down my workflow, and would be nice to have it resolved. Otherwise, I have to reboot to bring pci2 back up. Any insight? Thanks! Farhan Khan -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJZg9G5AAoJEP+hyuFlNlHKvsYP/2fKeR2LSei6VpT744zF0YdX Ykbzc8fXD2q7KMsyqgwEnE4+z8eCWqRKUtSCC8JuVSv8HdOyzytZHY74S0faHrgl /yJr5gfjB1btLk81qtz6aP00Ze51svqBif4qpU3el8k/L8qvXaHfj6Y76jALVede yQ0Vyl3CQUwpvnWm6FaON4ocuukxxm6l9YFHcSceEHcUWEA1I+SAoxhR5GLiVMvP Qf0W1P16L2S6t2bxf6sYY3DbMKXeJxs2foli0fmoqtOhjUk73MwsLo+3qXb3fp+Z s6HfxDsRbb0nyqVZGREtcArTSvdkopx87wBG42HMGMCdGFbM3nn66R42JyF4etI/ rlV8y2kV90VZ4S7Oh4Sqzs9fexwx9HXso7yLfEepQxQbA8a4Q0cVl/jG6CAUR0vN ELn7lYHVEcR99sfwuMkk1RuPPub3Rvmn124mZjQ0cKU0wE7ftlzZ169nvCRm/TZ/ UEFFdiTNrhqPu8wfeEBzHfM7ZJpH8Gz1LRYX9r9ZjW50rZ1j8NH5+dJsaZmacyj0 4fxzkyfXUeVa+MwBdckjDiPvsFK1y9l+7/NfAKDMxhZr3NkgPmLyXR9hf7gE3h39 MsGG0Z7K5fdTFtoQlF5yqYe6mT1Wd1QErE4OS7iRbvVRLChD9ol1vWScwwQFaGj0 C4cA165raXdlGdRr6WjO =7DVs -----END PGP SIGNATURE-----