From patchwork Fri Mar 4 17:28:48 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Tissoires X-Patchwork-Id: 548389 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 739A9C4332F for ; Fri, 4 Mar 2022 17:35:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241234AbiCDRga (ORCPT ); Fri, 4 Mar 2022 12:36:30 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46138 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241383AbiCDRgT (ORCPT ); Fri, 4 Mar 2022 12:36:19 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 024AC1D3AC5 for ; Fri, 4 Mar 2022 09:34:40 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1646415280; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=T7C9fiyEzdqJww9q8MHw/Ezwfh03XjAvosyY3fabJCA=; b=M+dmyIQzmX9GiSB/vjtqwani+gFsLf6ib8UR68aMfDsGxOH2/QXHmFsDj2oUYW66zhQRQw DwO19EsZ/Yqi6slCz9dDwDawq8yS/1kWV4YbC35LerkyW2qsju0iHeSahYu8b0d5uW3sxf DaNrKgQhTMq7THBTNG2kPNga9JtXiFc= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-424-vDZVZTx9PuGg1UxPErrkZQ-1; Fri, 04 Mar 2022 12:34:37 -0500 X-MC-Unique: vDZVZTx9PuGg1UxPErrkZQ-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 98CE75EF; Fri, 4 Mar 2022 17:34:34 +0000 (UTC) Received: from plouf.redhat.com (unknown [10.39.192.55]) by smtp.corp.redhat.com (Postfix) with ESMTP id AAE9186595; Fri, 4 Mar 2022 17:34:30 +0000 (UTC) From: Benjamin Tissoires To: Greg KH , Jiri Kosina , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Shuah Khan , Dave Marchevsky , Joe Stringer Cc: Tero Kristo , linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, Benjamin Tissoires Subject: [PATCH bpf-next v2 24/28] HID: bpf: only call hid_bpf_raw_event() if a ctx is available Date: Fri, 4 Mar 2022 18:28:48 +0100 Message-Id: <20220304172852.274126-25-benjamin.tissoires@redhat.com> In-Reply-To: <20220304172852.274126-1-benjamin.tissoires@redhat.com> References: <20220304172852.274126-1-benjamin.tissoires@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org the context is allocated the first time a program of type DEVICE_EVENT is attached to the device. To not add too much jumps in the code for the general device handling, call hid_bpf_raw_event() only if we know that a program has been attached once during the life of the device. Signed-off-by: Benjamin Tissoires --- new in v2 --- drivers/hid/hid-core.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index d0e015986e17..2b49f6064a40 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -1751,10 +1751,13 @@ int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, u32 size, u8 *cdata; int ret = 0; - data = hid_bpf_raw_event(hid, data, &size); - if (IS_ERR(data)) { - ret = PTR_ERR(data); - goto out; + /* we pre-test if ctx is available here to cut the calls at the earliest */ + if (hid->bpf.ctx) { + data = hid_bpf_raw_event(hid, data, &size); + if (IS_ERR(data)) { + ret = PTR_ERR(data); + goto out; + } } report = hid_get_report(report_enum, data);