[{"id":3676241,"web_url":"http://patchwork.ozlabs.org/comment/3676241/","msgid":"","list_archive_url":null,"date":"2026-04-12T07:06:42","subject":"Re: [PATCH] ata: libata-scsi: fix requeue of deferred ATA\n PASS-THROUGH commands","submitter":{"id":86188,"url":"http://patchwork.ozlabs.org/api/people/86188/","name":"Damien Le Moal","email":"dlemoal@kernel.org"},"content":"On 4/11/26 01:15, Igor Pylypiv wrote:\n> Commit 0ea84089dbf6 (\"ata: libata-scsi: avoid Non-NCQ command starvation\")\n> introduced ata_scsi_requeue_deferred_qc() to handle commands deferred\n> during resets or NCQ failures. This deferral logic completed commands\n> with DID_SOFT_ERROR to trigger a retry in the SCSI mid-layer.\n> \n> However, DID_SOFT_ERROR is subject to scsi_cmd_retry_allowed() checks.\n> ATA PASS-THROUGH commands sent via SG_IO ioctl have scmd->allowed set\n> to zero. This causes the mid-layer to fail the command immediately\n> instead of retrying, even though the command was never actually issued\n> to the hardware.\n> \n> Switch to DID_REQUEUE to ensure these commands are inserted back into\n> the request queue regardless of retry limits.\n\nI really thought that DID_SOFT_ERROR was not decrementing the retry counter.\nChecking the code again, I was wrong. Good catch !\n\n> Fixes: 0ea84089dbf6 (\"ata: libata-scsi: avoid Non-NCQ command starvation\")\n> Signed-off-by: Igor Pylypiv \n\nReviewed-by: Damien Le Moal ","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-ide@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=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=PqTxhxnS;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=104.64.211.4; helo=sin.lore.kernel.org;\n envelope-from=linux-ide+bounces-5472-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=\"PqTxhxnS\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=10.30.226.201"],"Received":["from sin.lore.kernel.org (sin.lore.kernel.org [104.64.211.4])\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 4fthRb0nzGz1xtJ\n\tfor ; Sun, 12 Apr 2026 17:06:50 +1000 (AEST)","from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby sin.lore.kernel.org (Postfix) with ESMTP id E675130074C4\n\tfor ; Sun, 12 Apr 2026 07:06:48 +0000 (UTC)","from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id 5E2112D3ED1;\n\tSun, 12 Apr 2026 07:06:46 +0000 (UTC)","from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org\n [10.30.226.201])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id 3B3A025C6EE;\n\tSun, 12 Apr 2026 07:06:45 +0000 (UTC)","by smtp.kernel.org (Postfix) with ESMTPSA id EB355C19424;\n\tSun, 12 Apr 2026 07:06:43 +0000 (UTC)"],"ARC-Seal":"i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1775977606; cv=none;\n b=N5WBYUhpjivZmZUkWRc2x/3wluDDnASKa33kXtENZ6xtkZbN36ckEA0NUdI1FuaRYzAYj3tLfyp6tLWZYkuMDtJa70GAplBxZWU567075KLGpP+Zq8zi2VAJkeFls3Nf1Md2Gp6WimiS4lmvbRPN0hZmUDHS6mIA5L7r4oxRM14=","ARC-Message-Signature":"i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1775977606; c=relaxed/simple;\n\tbh=piPTtxWdeHkJmiAvnn6mW8xtz1+41ziC+xy5YtOdpL8=;\n\th=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From:\n\t In-Reply-To:Content-Type;\n b=XFvl6d8V96dUf7p0rA+5QvWTo5OYsdJ5ePNAn5C8vlbNYx0mp8K3QRVw2s6xhRauqbdigzZy148YwCc7uTmmCHxPbyroQ/zXTFvYJHyX66QjXBjKEm5Id7bbyEQvTGfWFyF4QiGNPhbmyqhZS2RHWj+HydspDkktOgxd2SjmMr8=","ARC-Authentication-Results":"i=1; smtp.subspace.kernel.org;\n dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=PqTxhxnS; arc=none smtp.client-ip=10.30.226.201","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1775977605;\n\tbh=piPTtxWdeHkJmiAvnn6mW8xtz1+41ziC+xy5YtOdpL8=;\n\th=Date:Subject:To:Cc:References:From:In-Reply-To:From;\n\tb=PqTxhxnSaQLrHAmX4m+LNNO6BhoeuPn122bz0wVco+RX+y+zzUcXVLFyQ449VVL9B\n\t 7oJ2QqzBMdfd9oPP95bN9EepLLhblIOoQDc1m9+PLS/NomFSd8ONPe3ccdJiOiN+9m\n\t zK/DNF/+9g/klmLHfyZ37tomnuXQvZ21AJ6LQABRsizoYypvAuaKBQl8rJxaOWcGaA\n\t PDPj3+ziJ3M31IDTiCOjH3HJHWkXEgae+RY2xhyuR0UEDrh8b1ukdHxvlRt+1Owinc\n\t 7GVYOqA4qFgvn7JMo5OJ/nnFEVlYb40M5UXv2VVkbvQtZ28Z1VgBWTybu/Q603ZD1a\n\t 1un+qd+2q7bdA==","Message-ID":"","Date":"Sun, 12 Apr 2026 09:06:42 +0200","Precedence":"bulk","X-Mailing-List":"linux-ide@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","User-Agent":"Mozilla Thunderbird","Subject":"Re: [PATCH] ata: libata-scsi: fix requeue of deferred ATA\n PASS-THROUGH commands","To":"Igor Pylypiv , Niklas Cassel ","Cc":"\"Martin K. Petersen\" ,\n John Garry , Xingui Yang ,\n linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org","References":"<20260410231519.951971-1-ipylypiv@google.com>","Content-Language":"en-US","From":"Damien Le Moal ","Organization":"Western Digital Research","In-Reply-To":"<20260410231519.951971-1-ipylypiv@google.com>","Content-Type":"text/plain; charset=UTF-8","Content-Transfer-Encoding":"7bit"}},{"id":3676258,"web_url":"http://patchwork.ozlabs.org/comment/3676258/","msgid":"","list_archive_url":null,"date":"2026-04-12T10:42:46","subject":"Re: [PATCH] ata: libata-scsi: fix requeue of deferred ATA\n PASS-THROUGH commands","submitter":{"id":87751,"url":"http://patchwork.ozlabs.org/api/people/87751/","name":"Niklas Cassel","email":"cassel@kernel.org"},"content":"On Fri, Apr 10, 2026 at 04:15:19PM -0700, Igor Pylypiv wrote:\n> Commit 0ea84089dbf6 (\"ata: libata-scsi: avoid Non-NCQ command starvation\")\n> introduced ata_scsi_requeue_deferred_qc() to handle commands deferred\n> during resets or NCQ failures. This deferral logic completed commands\n> with DID_SOFT_ERROR to trigger a retry in the SCSI mid-layer.\n> \n> However, DID_SOFT_ERROR is subject to scsi_cmd_retry_allowed() checks.\n> ATA PASS-THROUGH commands sent via SG_IO ioctl have scmd->allowed set\n> to zero. This causes the mid-layer to fail the command immediately\n> instead of retrying, even though the command was never actually issued\n> to the hardware.\n> \n> Switch to DID_REQUEUE to ensure these commands are inserted back into\n> the request queue regardless of retry limits.\n> \n> Fixes: 0ea84089dbf6 (\"ata: libata-scsi: avoid Non-NCQ command starvation\")\n> Signed-off-by: Igor Pylypiv \n> ---\n> drivers/ata/libata-scsi.c | 4 ++--\n> 1 file changed, 2 insertions(+), 2 deletions(-)\n> \n> diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c\n> index 3b65df914ebb..0236394900cc 100644\n> --- a/drivers/ata/libata-scsi.c\n> +++ b/drivers/ata/libata-scsi.c\n> @@ -1692,7 +1692,7 @@ void ata_scsi_requeue_deferred_qc(struct ata_port *ap)\n> \t/*\n> \t * If we have a deferred qc when a reset occurs or NCQ commands fail,\n> \t * do not try to be smart about what to do with this deferred command\n> -\t * and simply retry it by completing it with DID_SOFT_ERROR.\n> +\t * and simply requeue it by completing it with DID_REQUEUE.\n> \t */\n> \tif (!qc)\n> \t\treturn;\n> @@ -1701,7 +1701,7 @@ void ata_scsi_requeue_deferred_qc(struct ata_port *ap)\n> \tap->deferred_qc = NULL;\n> \tcancel_work(&ap->deferred_qc_work);\n> \tata_qc_free(qc);\n> -\tscmd->result = (DID_SOFT_ERROR << 16);\n> +\tset_host_byte(scmd, DID_REQUEUE);\n\nset_host_byte() will set the host byte, but it will keep the status byte\nand the ML byte intact.\n\nBy using the assignment operator, I assumed that Damien intentionally\nwanted to clear the status byte and the ML byte.\n\nMy point is that using set_host_byte() is a logical change.\nIf we want to stop clearing the status byte and the ML byte, then I think\nthat change should be in a separate commit, with a proper motivation/commit\nmessage.\n\nHowever, for the fix patch itself, I think we should just do:\n-\tscmd->result = (DID_SOFT_ERROR << 16);\n+\tscmd->result = (DID_REQUEUE << 16);\n\n\nIf that is sufficient to fix your observed problem.\n\nI would also be happy to see a follow up patch that changes to use\nset_host_byte(), if there is a motivation that can motivate why that change\nis safe/valid.\n\n\nKind regards,\nNiklas","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-ide@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=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=i0UMKbwr;\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; 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Petersen\" ,\n\tJohn Garry ,\n\tXingui Yang , linux-ide@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org","Subject":"Re: [PATCH] ata: libata-scsi: fix requeue of deferred ATA\n PASS-THROUGH commands","Message-ID":"","References":"<20260410231519.951971-1-ipylypiv@google.com>","Precedence":"bulk","X-Mailing-List":"linux-ide@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":"<20260410231519.951971-1-ipylypiv@google.com>"}},{"id":3676306,"web_url":"http://patchwork.ozlabs.org/comment/3676306/","msgid":"","list_archive_url":null,"date":"2026-04-12T15:24:39","subject":"Re: [PATCH] ata: libata-scsi: fix requeue of deferred ATA\n PASS-THROUGH commands","submitter":{"id":86149,"url":"http://patchwork.ozlabs.org/api/people/86149/","name":"Igor Pylypiv","email":"ipylypiv@google.com"},"content":"On Sun, Apr 12, 2026 at 12:42:46PM +0200, Niklas Cassel wrote:\n> On Fri, Apr 10, 2026 at 04:15:19PM -0700, Igor Pylypiv wrote:\n> > Commit 0ea84089dbf6 (\"ata: libata-scsi: avoid Non-NCQ command starvation\")\n> > introduced ata_scsi_requeue_deferred_qc() to handle commands deferred\n> > during resets or NCQ failures. This deferral logic completed commands\n> > with DID_SOFT_ERROR to trigger a retry in the SCSI mid-layer.\n> > \n> > However, DID_SOFT_ERROR is subject to scsi_cmd_retry_allowed() checks.\n> > ATA PASS-THROUGH commands sent via SG_IO ioctl have scmd->allowed set\n> > to zero. This causes the mid-layer to fail the command immediately\n> > instead of retrying, even though the command was never actually issued\n> > to the hardware.\n> > \n> > Switch to DID_REQUEUE to ensure these commands are inserted back into\n> > the request queue regardless of retry limits.\n> > \n> > Fixes: 0ea84089dbf6 (\"ata: libata-scsi: avoid Non-NCQ command starvation\")\n> > Signed-off-by: Igor Pylypiv \n> > ---\n> > drivers/ata/libata-scsi.c | 4 ++--\n> > 1 file changed, 2 insertions(+), 2 deletions(-)\n> > \n> > diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c\n> > index 3b65df914ebb..0236394900cc 100644\n> > --- a/drivers/ata/libata-scsi.c\n> > +++ b/drivers/ata/libata-scsi.c\n> > @@ -1692,7 +1692,7 @@ void ata_scsi_requeue_deferred_qc(struct ata_port *ap)\n> > \t/*\n> > \t * If we have a deferred qc when a reset occurs or NCQ commands fail,\n> > \t * do not try to be smart about what to do with this deferred command\n> > -\t * and simply retry it by completing it with DID_SOFT_ERROR.\n> > +\t * and simply requeue it by completing it with DID_REQUEUE.\n> > \t */\n> > \tif (!qc)\n> > \t\treturn;\n> > @@ -1701,7 +1701,7 @@ void ata_scsi_requeue_deferred_qc(struct ata_port *ap)\n> > \tap->deferred_qc = NULL;\n> > \tcancel_work(&ap->deferred_qc_work);\n> > \tata_qc_free(qc);\n> > -\tscmd->result = (DID_SOFT_ERROR << 16);\n> > +\tset_host_byte(scmd, DID_REQUEUE);\n> \n> set_host_byte() will set the host byte, but it will keep the status byte\n> and the ML byte intact.\n> \n> By using the assignment operator, I assumed that Damien intentionally\n> wanted to clear the status byte and the ML byte.\n> \n> My point is that using set_host_byte() is a logical change.\n> If we want to stop clearing the status byte and the ML byte, then I think\n> that change should be in a separate commit, with a proper motivation/commit\n> message.\n> \n> However, for the fix patch itself, I think we should just do:\n> -\tscmd->result = (DID_SOFT_ERROR << 16);\n> +\tscmd->result = (DID_REQUEUE << 16);\n> \n\nHi Niklas,\n\nThank you for pointing it out. I agree. Switching to set_host_byte()\nis logically a different change from the problem that this commit\nis fixing. There is no particular need for using set_host_byte().\n\nI'll send a v2 to drop set_host_byte().\n\nThanks,\nIgor\n\n> \n> If that is sufficient to fix your observed problem.\n> \n> I would also be happy to see a follow up patch that changes to use\n> set_host_byte(), if there is a motivation that can motivate why that change\n> is safe/valid.\n> \n> \n> Kind regards,\n> Niklas","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-ide@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=google.com header.i=@google.com header.a=rsa-sha256\n header.s=20251104 header.b=kRjBf64B;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; helo=sea.lore.kernel.org;\n envelope-from=linux-ide+bounces-5477-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=google.com header.i=@google.com\n header.b=\"kRjBf64B\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=74.125.82.53","smtp.subspace.kernel.org;\n dmarc=pass (p=reject dis=none) header.from=google.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=google.com"],"Received":["from sea.lore.kernel.org (sea.lore.kernel.org\n [IPv6:2600:3c0a:e001:db::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 4ftvZp4Gpmz1yCx\n\tfor ; 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Petersen\" ,\n\tJohn Garry ,\n\tXingui Yang , linux-ide@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org","Subject":"Re: [PATCH] ata: libata-scsi: fix requeue of deferred ATA\n PASS-THROUGH commands","Message-ID":"","References":"<20260410231519.951971-1-ipylypiv@google.com>\n ","Precedence":"bulk","X-Mailing-List":"linux-ide@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":""}}]