From nobody Thu Dec 18 21:50:35 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 448281B3930 for ; Wed, 4 Dec 2024 11:43:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733312615; cv=none; b=CuDUvPq/zxRE+8rc7Kcu/RPsvGDP9j9XoAh4SYrvxGigVhdN3xtMCGyc6DanZXpyZbMrdMOfaFEzDZNRASygLDZtt6Mx8HekMDu7OH2e3nV4BK6+R4nm3n7cBcrtUVqNykb9r34fMzPbSgJ7o5SFCmp+RuH9xOLsbZiV5g+evJ0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733312615; c=relaxed/simple; bh=l2z9VD5HlFDHOtvxJuuLIRNAdEnNKlZq9mCp1WP8k+I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=I/t19Ae1MCRCd4k26BqkXdqslwXS9YEK0JxTRJuxAWplPXBeENPUbPDGF76sp6UMAyv0Z0pMWBW/A+zt8xbQmDlP+AyOxuMx8V7dcy5kwe1aRo5eBECSKtYRqW4y8OR2leK+P1+Rj5rYFQcjTtAw7zNbANNhLEwtsurw/3948Xc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=BTatPOYL; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="BTatPOYL" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1733312613; 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=YjLiIgA1heSf6FeldDRqyic0hKMQLJvylr1VcRItvD4=; b=BTatPOYL84x0N9kvooKgOKfDlfZKL4VjxTRc5PZweYx67LtnFHwVYLGIJ/TzAxSQSj1ENa G6u8Jqj/2uW9WjpiZIV6Jg/ji13NsC2pfW/KP1FroNQKbDQ5H1dISCuINPaSE0oPKO56eS anj8QnLr51Rl84EFjqeCDlDO8ioVHiE= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-439-CrQUMUH4NIapA6bZIKoFvA-1; Wed, 04 Dec 2024 06:43:29 -0500 X-MC-Unique: CrQUMUH4NIapA6bZIKoFvA-1 X-Mimecast-MFC-AGG-ID: CrQUMUH4NIapA6bZIKoFvA Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id D233B1955F68; Wed, 4 Dec 2024 11:43:26 +0000 (UTC) Received: from wcosta-thinkpadt14gen4.rmtbr.csb (unknown [10.22.88.52]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id B95643000197; Wed, 4 Dec 2024 11:43:20 +0000 (UTC) From: Wander Lairson Costa To: Tony Nguyen , Przemek Kitszel , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Sebastian Andrzej Siewior , Clark Williams , Steven Rostedt , Auke Kok , Jeff Garzik , intel-wired-lan@lists.osuosl.org (moderated list:INTEL ETHERNET DRIVERS), netdev@vger.kernel.org (open list:NETWORKING DRIVERS), linux-kernel@vger.kernel.org (open list), linux-rt-devel@lists.linux.dev (open list:Real-time Linux (PREEMPT_RT):Keyword:PREEMPT_RT) Cc: Wander Lairson Costa Subject: [PATCH iwl-net 1/4] igb: narrow scope of vfs_lock in SR-IOV cleanup Date: Wed, 4 Dec 2024 08:42:24 -0300 Message-ID: <20241204114229.21452-2-wander@redhat.com> In-Reply-To: <20241204114229.21452-1-wander@redhat.com> References: <20241204114229.21452-1-wander@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 The adapter->vfs_lock currently protects critical sections shared between igb_disable_sriov() and igb_msg_task(). Since igb_msg_task() =E2=80=94 whic= h is invoked solely by the igb_msix_other() ISR=E2=80=94only proceeds when adapter->vfs_allocated_count > 0, we can reduce the lock scope further. By moving the assignment adapter->vfs_allocated_count =3D 0 to the start of= the cleanup code in igb_disable_sriov(), we can restrict the spinlock protection solely to this assignment. This change removes kfree() calls from within the locked section, simplifying lock management. Once kfree() is outside the vfs_lock scope, it becomes possible to safely convert vfs_lock to a raw_spin_lock. Signed-off-by: Wander Lairson Costa Tested-by: Rafal Romanowski --- drivers/net/ethernet/intel/igb/igb_main.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethern= et/intel/igb/igb_main.c index 08578980b6518..4ca25660e876e 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -3708,12 +3708,12 @@ static int igb_disable_sriov(struct pci_dev *pdev, = bool reinit) msleep(500); } spin_lock_irqsave(&adapter->vfs_lock, flags); + adapter->vfs_allocated_count =3D 0; + spin_unlock_irqrestore(&adapter->vfs_lock, flags); kfree(adapter->vf_mac_list); adapter->vf_mac_list =3D NULL; kfree(adapter->vf_data); adapter->vf_data =3D NULL; - adapter->vfs_allocated_count =3D 0; - spin_unlock_irqrestore(&adapter->vfs_lock, flags); wr32(E1000_IOVCTL, E1000_IOVCTL_REUSE_VFQ); wrfl(); msleep(100); --=20 2.47.0