From patchwork Mon Dec 28 12:48:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 11991577 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_RED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 69F2AC43333 for ; Mon, 28 Dec 2020 16:49:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3CD3922B37 for ; Mon, 28 Dec 2020 16:49:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727940AbgL1Mwx (ORCPT ); Mon, 28 Dec 2020 07:52:53 -0500 Received: from mail.kernel.org ([198.145.29.99]:49798 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727802AbgL1Mwx (ORCPT ); Mon, 28 Dec 2020 07:52:53 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 0FD2C22583; Mon, 28 Dec 2020 12:51:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1609159910; bh=ZQx4jiJYSqq0ifLV2fS+ihkyAB+CjY19pTM7Afr80S8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hXM5KtDEGlWkUHKjUuqoNvB2GkzcLJY/FFO9N5C500A/6ATVvuIi1ZCt2u+AkRQZ1 lKFWf7R35Fy4TfboK2LEvjNjUqRBHBKl5hXPg4efrJh6wDKFipy/rQ60KA0WSIbtyn REsVWE9be0y8JE6FagQsPA90dtF5vVt1LGBicmN4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Thomas Gleixner , Thomas Winischhofer , linux-usb@vger.kernel.org Subject: [PATCH 4.4 018/132] USB: sisusbvga: Make console support depend on BROKEN Date: Mon, 28 Dec 2020 13:48:22 +0100 Message-Id: <20201228124847.289840307@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201228124846.409999325@linuxfoundation.org> References: <20201228124846.409999325@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From: Thomas Gleixner commit 862ee699fefe1e6d6f2c1518395f0b999b8beb15 upstream. The console part of sisusbvga is broken vs. printk(). It uses in_atomic() to detect contexts in which it cannot sleep despite the big fat comment in preempt.h which says: Do not use in_atomic() in driver code. in_atomic() does not work on kernels with CONFIG_PREEMPT_COUNT=n which means that spin/rw_lock held regions are not detected by it. There is no way to make this work by handing context information through to the driver and this only can be solved once the core printk infrastructure supports sleepable console drivers. Make it depend on BROKEN for now. Fixes: 1bbb4f2035d9 ("[PATCH] USB: sisusb[vga] update") Signed-off-by: Thomas Gleixner Cc: Thomas Winischhofer Cc: Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20201019101109.603244207@linutronix.de Signed-off-by: Greg Kroah-Hartman --- drivers/usb/misc/sisusbvga/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/usb/misc/sisusbvga/Kconfig +++ b/drivers/usb/misc/sisusbvga/Kconfig @@ -15,7 +15,7 @@ config USB_SISUSBVGA config USB_SISUSBVGA_CON bool "Text console and mode switching support" if USB_SISUSBVGA - depends on VT + depends on VT && BROKEN select FONT_8x16 ---help--- Say Y here if you want a VGA text console via the USB dongle or