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[23.128.96.18]) by mx.google.com with ESMTP id m6si23982892edc.576.2021.06.23.07.12.27; Wed, 23 Jun 2021 07:12:50 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=fail (test mode) header.i=@sang-engineering.com header.s=k1 header.b=ocAEe0L4; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231262AbhFWOKg (ORCPT + 99 others); Wed, 23 Jun 2021 10:10:36 -0400 Received: from www.zeus03.de ([194.117.254.33]:51858 "EHLO mail.zeus03.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231261AbhFWOK1 (ORCPT ); Wed, 23 Jun 2021 10:10:27 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=sang-engineering.com; h= date:from:to:cc:subject:message-id:references:mime-version :content-type:in-reply-to; s=k1; bh=Mj7EQ7nV6Jff7yb7wTLlSMV9KN4G GlxCKUMrrU/WKG0=; b=ocAEe0L4rkKg1d6QWI1gro1X1R2AKa+p4y272Tb1UVP9 rGpOJ3/nYsIJC1LFxXspuOzc0HRIGeLp90Lm3EI/F/p+vjrIP/foSuV0KTZ09fH0 qNaDAIJz29s7VrZEBTTXzPkFC7L+nNqkryZIc1FvayFL7Hnu7rT62YeZ38mZDT4= Received: (qmail 2630227 invoked from network); 23 Jun 2021 16:08:08 +0200 Received: by mail.zeus03.de with ESMTPSA (TLS_AES_256_GCM_SHA384 encrypted, authenticated); 23 Jun 2021 16:08:08 +0200 X-UD-Smtp-Session: l3s3148p1@Xfieb2/FVMUgAwDPXwWqAK4jk/jYs7Oa Date: Wed, 23 Jun 2021 16:08:08 +0200 From: Wolfram Sang To: Geert Uytterhoeven Cc: Linux MMC List , Linux-Renesas , Linux I2C , Linux Kernel Mailing List Subject: Re: [PATCH 5/7] i2c: rcar: : use proper DMAENGINE API for termination Message-ID: Mail-Followup-To: Wolfram Sang , Geert Uytterhoeven , Linux MMC List , Linux-Renesas , Linux I2C , Linux Kernel Mailing List References: <20210623095942.3325-1-wsa+renesas@sang-engineering.com> <20210623095942.3325-6-wsa+renesas@sang-engineering.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="Z0m2yZezuwqrXzq0" Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --Z0m2yZezuwqrXzq0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline > Is this safe? The driver is not using a threaded irq, and DMA termination > may be called from the interrupt handler. You are right, this will not work. Not my best day today, I overlooked it for i2c-rcar and lost the note pointing out the same issue for stm32f7 :( > Have you tried triggering DMA termination, with lockdep enabled? Nope. As the code didn't show signs of async nature, I assumed sync was desired anyhow. --Z0m2yZezuwqrXzq0 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAmDTQEgACgkQFA3kzBSg Kba2eQ/+PTvyfQg4n/PazU8mc7PeuEydjDsjlvyoZeRijo5PCY1/JU5x2WnfDA/K PRIUd/IqAmJuvB+38UY9TgqWmRheri6XfyYhqbLE9Yt6MjMjFYhKKce/9PAr04nS 5j2/CqpCoU0aWC1CNBdJNXDFGV3vFReq+ej9zexu01LRyR5oWu5etce2iux2U/pn FJ7FB2tABa80dRUxETG7vSCAxJla0L8efirY1dlFbFH0mZeN/tiG1apEXYjJhD5A ds9M4DkKcYhc2JIK2MCEgb0RDYdxcv1x7ff+Eud9cAfL28SnQUUFmGTvUXQBRCQr OyRBctpCvDRDu3jKKcW/J0wK3sn9FJKyws0HoH2/L1k7KjK66PF34Upqd/VCmt0r fMSbT9XwZCbQorwkolfW60JmfaIIaNEnwcYLjJd99ElpgYnqahmYlPUgVCC+ByzH oSXLiSO2purA2ZerMj7wNyMpkf99U3pERaJvs5imoGgWepicyKrY/OIJ4kFDKZVK XICVU4I4xXevkcQyaS90kgCyiM7k31K3FORtCoMnoRqRUlaltdNu+46tLwTrZRte eHRNya3znaxWNIYy15v5ddatwcQnyRImJZzhI7BMhQr3A5JaCMcv8FEH86M3CZZg FxKuKiqwejA9Vj+EvWp34mTnqify/ZZQ0/Z3NZXnj0FeX57Ek6o= =lvkI -----END PGP SIGNATURE----- --Z0m2yZezuwqrXzq0--