[{"id":3686908,"web_url":"http://patchwork.ozlabs.org/comment/3686908/","msgid":"","list_archive_url":null,"date":"2026-05-06T09:11:55","subject":"Re: [PATCH] i2c: ls2x-v2: return IRQ_HANDLED after servicing an error","submitter":{"id":46495,"url":"http://patchwork.ozlabs.org/api/people/46495/","name":"Andy Shevchenko","email":"andriy.shevchenko@intel.com"},"content":"On Wed, May 06, 2026 at 05:48:18AM +0100, David Carlier wrote:\n> The event ISR reads SR1 and, when an error flag (ARLO/AF/BERR) is set,\n> calls loongson2_i2c_isr_error() which clears the offending flag, issues\n> STOP for the AF case, records msg->result, masks every CR2 interrupt\n> enable and completes the waiter. The handler then returns IRQ_NONE,\n> declaring to the IRQ core that the device did not interrupt.\n> \n> That report is wrong. The device did interrupt and the handler fully\n> serviced it. Because the IRQ is requested with IRQF_SHARED, the genirq\n> spurious-IRQ tracker counts each error as unhandled. A bus that emits\n> sporadic NACKs, arbitration losses or bus errors will therefore march\n> toward the spurious-IRQ threshold and the line can end up disabled,\n> wedging the controller.\n\nHave you exhibited this on a real HW?\n\n> Return IRQ_HANDLED on this path. The other IRQ_NONE site, taken when\n> neither an event nor an error bit is set, remains correct.\n\nHmm... This sounds logical, but we need the Loongson folks to confirm as this\nis sensitive code and changes like this may affect existing work flows.\n\n> 1 file changed, 1 insertion(+), 1 deletion(-)\n> \n> diff --git a/drivers/i2c/busses/i2c-ls2x-v2.c b/drivers/i2c/busses/i2c-ls2x-v2.c\n> index 517760d70169..9df73557ecc4 100644\n> --- a/drivers/i2c/busses/i2c-ls2x-v2.c\n> +++ b/drivers/i2c/busses/i2c-ls2x-v2.c\n> @@ -304,7 +304,7 @@ static irqreturn_t loongson2_i2c_isr_event(int irq, void *data)\n> \tregmap_read(priv->regmap, LOONGSON2_I2C_SR1, &status);\n> \tif (status & LOONGSON2_I2C_SR1_ITERREN_MASK) {\n> \t\tloongson2_i2c_isr_error(status, data);\n> -\t\treturn IRQ_NONE;\n> +\t\treturn IRQ_HANDLED;\n> \t}\n> \n> \tregmap_read(priv->regmap, LOONGSON2_I2C_CR2, &cr2);\n\nP.S.\nIs the analysis and/or commit message AI assisted?","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-i2c@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256\n header.s=Intel header.b=MchCgeLu;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.105.105.114; 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a=rsa-sha256; c=relaxed/simple;\n d=intel.com; i=@intel.com; q=dns/txt; s=Intel;\n t=1778058720; x=1809594720;\n h=date:from:to:cc:subject:message-id:references:\n mime-version:in-reply-to;\n bh=k/9nC1Oh9B1Vz5BNPYgltV2a5XRrsgqGv3XuyqCaGQk=;\n b=MchCgeLura1zPOmQUQklDeugZlQsfNnfpxE4YgHPMoaPHma5/rUgu+XJ\n MsrwzNs3QEH/MWWGmtTdzwHPgubC+ZADV3hkLqYcSw7bYts/pwQCup+WO\n UZMRkcGcK2+bZ/UB4Vz3XimwuDFsOIsRTggyZOZBjSYRBmMWvJgoCmduo\n a72hC2LUZZ+urYnHrW5zLlD89nRImRYjjFSEXLH6DSacc4AM3u+JpmGEa\n JmrsavgTqqfprxLwVOPgWtYKlAierHkDsGzbnVnnEhUHeLV4vGlboe3yw\n X3Sa11VCHbIoQaheB5gk9t2kwI9MrpOixuqQF3U3llEf5T1VZQSUAluKW\n w==;","X-CSE-ConnectionGUID":["OhEsLx+9RxSQy8Gu4i0obA==","Im+XSyRZQ72lQKQe6NrWSA=="],"X-CSE-MsgGUID":["MZctEVg0SQe4RRR5j1RVsQ==","/aWWs2tkTNiiOTTqysH8FA=="],"X-IronPort-AV":["E=McAfee;i=\"6800,10657,11777\"; a=\"79031436\"","E=Sophos;i=\"6.23,219,1770624000\";\n d=\"scan'208\";a=\"79031436\"","E=Sophos;i=\"6.23,219,1770624000\";\n d=\"scan'208\";a=\"235247650\""],"X-ExtLoop1":"1","Date":"Wed, 6 May 2026 12:11:55 +0300","From":"Andy Shevchenko ","To":"David Carlier ","Cc":"Andi Shyti ,\n\tBinbin Zhou ,\n\tHuacai Chen , linux-i2c@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org","Subject":"Re: [PATCH] i2c: ls2x-v2: return IRQ_HANDLED after servicing an error","Message-ID":"","References":"<20260506044818.19842-1-devnexen@gmail.com>","Precedence":"bulk","X-Mailing-List":"linux-i2c@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Type":"text/plain; charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<20260506044818.19842-1-devnexen@gmail.com>","Organization":"Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6\n krs, Bertel Jungin Aukio 5, 02600 Espoo"}},{"id":3686937,"web_url":"http://patchwork.ozlabs.org/comment/3686937/","msgid":"","list_archive_url":null,"date":"2026-05-06T09:59:53","subject":"Re: [PATCH] i2c: ls2x-v2: return IRQ_HANDLED after servicing an error","submitter":{"id":84810,"url":"http://patchwork.ozlabs.org/api/people/84810/","name":"Binbin Zhou","email":"zhoubinbin@loongson.cn"},"content":"Hi all:\n\nOn 2026/5/6 17:11, Andy Shevchenko wrote:\n> On Wed, May 06, 2026 at 05:48:18AM +0100, David Carlier wrote:\n>> The event ISR reads SR1 and, when an error flag (ARLO/AF/BERR) is set,\n>> calls loongson2_i2c_isr_error() which clears the offending flag, issues\n>> STOP for the AF case, records msg->result, masks every CR2 interrupt\n>> enable and completes the waiter. The handler then returns IRQ_NONE,\n>> declaring to the IRQ core that the device did not interrupt.\n>>\n>> That report is wrong. The device did interrupt and the handler fully\n>> serviced it. Because the IRQ is requested with IRQF_SHARED, the genirq\n>> spurious-IRQ tracker counts each error as unhandled. A bus that emits\n>> sporadic NACKs, arbitration losses or bus errors will therefore march\n>> toward the spurious-IRQ threshold and the line can end up disabled,\n>> wedging the controller.\n> Have you exhibited this on a real HW?\n>\n>> Return IRQ_HANDLED on this path. The other IRQ_NONE site, taken when\n>> neither an event nor an error bit is set, remains correct.\n> Hmm... This sounds logical, but we need the Loongson folks to confirm as this\n> is sensitive code and changes like this may affect existing work flows.\n\nI will try to test this boundary case in the next couple of days.\n\n>\n>> 1 file changed, 1 insertion(+), 1 deletion(-)\n>>\n>> diff --git a/drivers/i2c/busses/i2c-ls2x-v2.c b/drivers/i2c/busses/i2c-ls2x-v2.c\n>> index 517760d70169..9df73557ecc4 100644\n>> --- a/drivers/i2c/busses/i2c-ls2x-v2.c\n>> +++ b/drivers/i2c/busses/i2c-ls2x-v2.c\n>> @@ -304,7 +304,7 @@ static irqreturn_t loongson2_i2c_isr_event(int irq, void *data)\n>> \tregmap_read(priv->regmap, LOONGSON2_I2C_SR1, &status);\n>> \tif (status & LOONGSON2_I2C_SR1_ITERREN_MASK) {\n>> \t\tloongson2_i2c_isr_error(status, data);\n>> -\t\treturn IRQ_NONE;\n>> +\t\treturn IRQ_HANDLED;\n>> \t}\n>> \n>> \tregmap_read(priv->regmap, LOONGSON2_I2C_CR2, &cr2);\n> P.S.\n> Is the analysis and/or commit message AI assisted?\nThanks.\nBinbin\n>","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-i2c@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.105.105.114; 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charset=UTF-8; format=flowed","Content-Transfer-Encoding":"7bit","X-CM-TRANSID":"qMiowJAxVcAZEftpSZd7AA--.45438S2","X-CM-SenderInfo":"p2kr3uplqex0o6or00hjvr0hdfq/1tbiAgETCGn62CoEzAAAsx","X-Coremail-Antispam":"1Uk129KBj93XoW7Ar45CryUCw4rur18XFW7ZFc_yoW8ZFy8pr\n\tW5GFnYkF1qgr1avFnIqry3Xa4YvrZxGFWUCF18Ka15Zan8tryUWr4xtFWY9r95ury8Jr42\n\tv3yDWw1fuas5ArXCm3ZEXasCq-sJn29KB7ZKAUJUUUU8529EdanIXcx71UUUUU7KY7ZEXa\n\tsCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU\n\t0xBIdaVrnRJUUUkjb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2\n\tIYs7xG6rWj6s0DM7CIcVAFz4kK6r106r15M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v\n\te4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Jr0_JF4l84ACjcxK6xIIjxv20xvEc7CjxVAFwI\n\t0_Jr0_Gr1l84ACjcxK6I8E87Iv67AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVCY1x0267AK\n\txVW8Jr0_Cr1UM2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2x26I8E6xACxx\n\t1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv\n\t67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IY64vIr41l42xK82IYc2Ij64\n\tvIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8G\n\tjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r126r1DMIIYrxkI7VAKI48JMIIF0xvE2I\n\tx0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r1j6r4UMIIF0xvE42xK\n\t8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I\n\t0E14v26r1j6r4UYxBIdaVFxhVjvjDU0xZFpf9x07j8yCJUUUUU="}},{"id":3686959,"web_url":"http://patchwork.ozlabs.org/comment/3686959/","msgid":"","list_archive_url":null,"date":"2026-05-06T10:36:05","subject":"Re: [PATCH] i2c: ls2x-v2: return IRQ_HANDLED after servicing an error","submitter":{"id":46495,"url":"http://patchwork.ozlabs.org/api/people/46495/","name":"Andy Shevchenko","email":"andriy.shevchenko@intel.com"},"content":"On Wed, May 06, 2026 at 11:26:14AM +0100, David CARLIER wrote:\n> On Wed, 6 May 2026, 10:12 Andy Shevchenko, \n> wrote:\n> > On Wed, May 06, 2026 at 05:48:18AM +0100, David Carlier wrote:\n\n...\n\n> > Is the analysis and/or commit message AI assisted?\n> >\n> No h w but I Vs seen the pattern in another driver but I used codex to\n> write commit message so I ll send a V2 later then. Cheers\n\nDon't forget to mention any AI assistance. There is a special tag\nAssisted-by: IIRC, but dunno if it's for reports and/or code analysis.","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-i2c@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256\n header.s=Intel header.b=T0Eo6X1W;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c09:e001:a7::12fc:5321; helo=sto.lore.kernel.org;\n envelope-from=linux-i2c+bounces-17270-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com\n header.b=\"T0Eo6X1W\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=192.198.163.12","smtp.subspace.kernel.org;\n dmarc=pass (p=none dis=none) header.from=intel.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=intel.com"],"Received":["from sto.lore.kernel.org (sto.lore.kernel.org\n [IPv6:2600:3c09:e001:a7::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g9Wy86v3lz1yJV\n\tfor ; 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