From nobody Fri Dec 19 19:15:50 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 CF2CE2973A0; Tue, 15 Apr 2025 15:37:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744731437; cv=none; b=TLGGEXE64Nu736UTXaK4s36f9aTeqbx6zZKODuntjR6s8632HLjmDyiSMulIaxMQSAnIR6OF99dAypApFDk0pEew0Pv4loCNDeu6hDCuCezSA3WGVEYqUVFbYM72eub5bn8qsAlE4MNBpy1HEEwa4UeFveuyyE+vhFfda5H81yU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744731437; c=relaxed/simple; bh=F6ydi+3Kh9gLpG3MhIJVGmiYu4P4h2LRSPQzIzRGasg=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=HPv1xWERjuRNT/IDA7Nx6t8adW1xmFKg6zd77ueVXCUKpOlqE0tU/s0h5vfquVT80Uk1C7W/u9gE/NE2jsKRrUdVISsSsJzfU8DlOdMYcpmLN5REr4cwCJ6xHSAI+M7RQCvY6DbhkqlIB9kvPiNDDzD6HxjN6mmeqc+IpHbjNuo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=nBdxMbZs; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="nBdxMbZs" Received: by smtp.kernel.org (Postfix) with ESMTPS id 541E0C4CEF1; Tue, 15 Apr 2025 15:37:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1744731437; bh=F6ydi+3Kh9gLpG3MhIJVGmiYu4P4h2LRSPQzIzRGasg=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=nBdxMbZseuEol55Y1Ny/cpNeEYq7uiD50JIs/gwKO1Foa2wPiCEWrc90lL1haY55m 1U/Avo4ZIeTMGB3B0hc8RtHCP+fUz1bh2A2nXzqENOb+2WfvRXprDXBqeNLCoJuZLD zEBzma6f58T7jbVHsEsmRO/7k15L34RmCdGfwwtOcxHX2/PGwMxk0Rl2AUyFdDAssB m1CvNeYIsiA8Aek7Vq8uG2im5lz8Ku3au63TEM2C6vbDxZy5V1Zeq34gNfiIOXXi7b +Ckbnl3Dd3I78yvbAcdPdFDJ24wap6NTAymjMZa8wXc2v/uNtLmmcjAZd5/3bavVVv hOwn1ihr8SoqA== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 457E4C369BA; Tue, 15 Apr 2025 15:37:17 +0000 (UTC) From: Sven Peter via B4 Relay Date: Tue, 15 Apr 2025 15:36:57 +0000 Subject: [PATCH v2 3/6] i2c: pasemi: Improve timeout handling 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 Message-Id: <20250415-pasemi-fixes-v2-3-c543bf53151a@svenpeter.dev> References: <20250415-pasemi-fixes-v2-0-c543bf53151a@svenpeter.dev> In-Reply-To: <20250415-pasemi-fixes-v2-0-c543bf53151a@svenpeter.dev> To: Janne Grunau , Alyssa Rosenzweig , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Andi Shyti , Neal Gompa , Hector Martin Cc: linuxppc-dev@lists.ozlabs.org, asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, Sven Peter X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=2138; i=sven@svenpeter.dev; h=from:subject:message-id; bh=pieYM48LE5ENsb4OlGmWM38fJJzel5K/67CDk0KItDE=; b=owGbwMvMwCHmIlirolUq95LxtFoSQ/q/WvWKcJ/Ij8b3P05fYM58StKf7c2kj6UO6rKVr2u/R bN/jY3vKGVhEONgkBVTZNm+3970ycM3gks3XXoPM4eVCWQIAxenAExk7yWG/w5Skwunb99z8fBu o7eC/youx5b+YzCc+W/XoprbuSEdnPcZGU4/lzac0t5wuYzjwwGL5tcNvtVFW7/VPLu1Y0rwgYr 9DAwA X-Developer-Key: i=sven@svenpeter.dev; a=openpgp; fpr=A1E3E34A2B3C820DBC4955E5993B08092F131F93 X-Endpoint-Received: by B4 Relay for sven@svenpeter.dev/default with auth_id=167 X-Original-From: Sven Peter Reply-To: sven@svenpeter.dev From: Sven Peter Add proper timeout handling for the interrupt path. Previously, this was only correctly done for the polling path. Note that we drop reg_write(smbus, REG_SMSTA, status) here which will be done anyway whenever the next transaction starts via pasemi_smb_clear. Signed-off-by: Sven Peter Reviewed-by: Alyssa Rosenzweig --- drivers/i2c/busses/i2c-pasemi-core.c | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-) diff --git a/drivers/i2c/busses/i2c-pasemi-core.c b/drivers/i2c/busses/i2c-= pasemi-core.c index df1b0087dcacb0a3b94196368137d5e20b0e6d7e..9b611dbdfef23e78a4ea75ac031= 1938d52b6ba96 100644 --- a/drivers/i2c/busses/i2c-pasemi-core.c +++ b/drivers/i2c/busses/i2c-pasemi-core.c @@ -91,32 +91,42 @@ static void pasemi_smb_clear(struct pasemi_smbus *smbus) static int pasemi_smb_waitready(struct pasemi_smbus *smbus) { int timeout =3D 100; + int ret; unsigned int status; =20 if (smbus->use_irq) { reinit_completion(&smbus->irq_completion); reg_write(smbus, REG_IMASK, SMSTA_XEN | SMSTA_MTN); - wait_for_completion_timeout(&smbus->irq_completion, msecs_to_jiffies(100= )); + ret =3D wait_for_completion_timeout(&smbus->irq_completion, msecs_to_jif= fies(100)); reg_write(smbus, REG_IMASK, 0); status =3D reg_read(smbus, REG_SMSTA); + + if (ret < 0) { + dev_err(smbus->dev, + "Completion wait failed with %d, status 0x%08x\n", + ret, status); + return ret; + } else if (ret =3D=3D 0) { + dev_warn(smbus->dev, "Timeout, status 0x%08x\n", status); + return -ETIME; + } } else { status =3D reg_read(smbus, REG_SMSTA); while (!(status & SMSTA_XEN) && timeout--) { msleep(1); status =3D reg_read(smbus, REG_SMSTA); } + + if (timeout < 0) { + dev_warn(smbus->dev, "Timeout, status 0x%08x\n", status); + return -ETIME; + } } =20 /* Got NACK? */ if (status & SMSTA_MTN) return -ENXIO; =20 - if (timeout < 0) { - dev_warn(smbus->dev, "Timeout, status 0x%08x\n", status); - reg_write(smbus, REG_SMSTA, status); - return -ETIME; - } - /* Clear XEN */ reg_write(smbus, REG_SMSTA, SMSTA_XEN); =20 --=20 2.34.1