From mboxrd@z Thu Jan 1 00:00:00 1970 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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 C531CC76192 for ; Thu, 18 Jul 2019 03:16:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 96D6A2077C for ; Thu, 18 Jul 2019 03:16:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563419801; bh=nK4AW3CIzRDcKNnOCyGAJX70zEbDY6+Z0KnJ/EY+JE4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=0FhgDYuS9bhvFQWs6eQTyqiI+q4/xYA8MLQYwfTvrTrFZlbTzVG6yKV1CREDD73xa DDKTVgz5sNH0lpzzftDcGFD1vITTM2675ppfPWtwvE6DWOjp4gCnooUtg3PABmodqw 8aEzNUKYDOuybelyelXA1uCZrmsT+pSFOpPATfCM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391032AbfGRDQh (ORCPT ); Wed, 17 Jul 2019 23:16:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:52162 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391900AbfGRDPQ (ORCPT ); Wed, 17 Jul 2019 23:15:16 -0400 Received: from localhost (115.42.148.210.bf.2iij.net [210.148.42.115]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4AEB721848; Thu, 18 Jul 2019 03:15:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563419715; bh=nK4AW3CIzRDcKNnOCyGAJX70zEbDY6+Z0KnJ/EY+JE4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TFiXqbHkx+tKLCdMcfMwqrMNhuoglhmqdccVTuDM+5xdry1+eRCIhQZuUsYectkhn b5mGNoa2XwRCShsX64zb05KRBdFvr4SIWHtnnRIr1IX7OX6Ag+9Q28tWOcAqsnww40 cid4MDL67QSUNAOPudVQfjNfEUOVb93XGKXE21s0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Julian Wiedmann , Vasily Gorbik Subject: [PATCH 4.4 39/40] s390/qdio: dont touch the dsci in tiqdio_add_input_queues() Date: Thu, 18 Jul 2019 12:02:35 +0900 Message-Id: <20190718030050.529071948@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190718030039.676518610@linuxfoundation.org> References: <20190718030039.676518610@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Julian Wiedmann commit ac6639cd3db607d386616487902b4cc1850a7be5 upstream. Current code sets the dsci to 0x00000080. Which doesn't make any sense, as the indicator area is located in the _left-most_ byte. Worse: if the dsci is the _shared_ indicator, this potentially clears the indication of activity for a _different_ device. tiqdio_thinint_handler() will then have no reason to call that device's IRQ handler, and the device ends up stalling. Fixes: d0c9d4a89fff ("[S390] qdio: set correct bit in dsci") Cc: Signed-off-by: Julian Wiedmann Signed-off-by: Vasily Gorbik Signed-off-by: Greg Kroah-Hartman --- drivers/s390/cio/qdio_thinint.c | 1 - 1 file changed, 1 deletion(-) --- a/drivers/s390/cio/qdio_thinint.c +++ b/drivers/s390/cio/qdio_thinint.c @@ -80,7 +80,6 @@ void tiqdio_add_input_queues(struct qdio mutex_lock(&tiq_list_lock); list_add_rcu(&irq_ptr->input_qs[0]->entry, &tiq_list); mutex_unlock(&tiq_list_lock); - xchg(irq_ptr->dsci, 1 << 7); } void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr)