Patch Detail
get:
Show a patch.
patch:
Update a patch.
put:
Update a patch.
GET /api/1.2/patches/2228533/?format=api
{ "id": 2228533, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2228533/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ide/patch/20260426190920.2051289-2-philpem@philpem.me.uk/", "project": { "id": 13, "url": "http://patchwork.ozlabs.org/api/1.2/projects/13/?format=api", "name": "Linux IDE development", "link_name": "linux-ide", "list_id": "linux-ide.vger.kernel.org", "list_email": "linux-ide@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260426190920.2051289-2-philpem@philpem.me.uk>", "list_archive_url": null, "date": "2026-04-26T19:09:14", "name": "[v3,1/7] ata: libata-scsi: add atapi_max_lun module parameter", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "84fa22356b9ad5c8c93c28a0c9ed67e12e39433b", "submitter": { "id": 93108, "url": "http://patchwork.ozlabs.org/api/1.2/people/93108/?format=api", "name": "Phil Pemberton", "email": "philpem@philpem.me.uk" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-ide/patch/20260426190920.2051289-2-philpem@philpem.me.uk/mbox/", "series": [ { "id": 501551, "url": "http://patchwork.ozlabs.org/api/1.2/series/501551/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ide/list/?series=501551", "date": "2026-04-26T19:09:18", "name": "ata: libata-scsi: multi-LUN ATAPI device support", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/501551/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2228533/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2228533/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-ide+bounces-5534-incoming=patchwork.ozlabs.org@vger.kernel.org>", "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 (1024-bit key;\n unprotected) header.d=philpem.me.uk header.i=@philpem.me.uk\n header.a=rsa-sha256 header.s=mail header.b=Pkei29j5;\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-5534-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)", "smtp.subspace.kernel.org;\n\tdkim=pass (1024-bit key) header.d=philpem.me.uk header.i=@philpem.me.uk\n header.b=\"Pkei29j5\"", "smtp.subspace.kernel.org;\n arc=none smtp.client-ip=178.62.38.78", "smtp.subspace.kernel.org;\n dmarc=pass (p=reject dis=none) header.from=philpem.me.uk", "smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=philpem.me.uk" ], "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 4g3bst714Xz1yHg\n\tfor <incoming@patchwork.ozlabs.org>; Mon, 27 Apr 2026 05:12:02 +1000 (AEST)", "from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby sea.lore.kernel.org (Postfix) with ESMTP id CD960302E334\n\tfor <incoming@patchwork.ozlabs.org>; Sun, 26 Apr 2026 19:09:39 +0000 (UTC)", "from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id CC0A237C0FB;\n\tSun, 26 Apr 2026 19:09:37 +0000 (UTC)", "from nick.sneptech.io (nick.sneptech.io [178.62.38.78])\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 3E1BB37C112;\n\tSun, 26 Apr 2026 19:09:36 +0000 (UTC)", "from wolf.philpem.me.uk (81-187-163-148.ip4.reverse-dns.uk\n [81.187.163.148])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest\n SHA256)\n\t(No client certificate requested)\n\t(Authenticated sender: mailrelay_wolf@philpem.me.uk)\n\tby nick.sneptech.io (Postfix) with ESMTPSA id 509B8BD366;\n\tSun, 26 Apr 2026 19:09:29 +0000 (UTC)", "from cheetah.homenet.philpem.me.uk (cheetah.homenet.philpem.me.uk\n [10.0.0.32])\n\tby wolf.philpem.me.uk (Postfix) with ESMTPSA id 0213D5FBA6;\n\tSun, 26 Apr 2026 20:09:29 +0100 (BST)" ], "ARC-Seal": "i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1777230577; cv=none;\n b=Ee12UQnvG0HKEhvuUYQynMfu/9TVnh0cEH6slF01oXUbdMM8gR/j3IzuaNXX6pvkilk0yMiJrZe0K4EYx2OgVM3zOMGx8Wgl/AYugQbLw5Ezk2GXZuRWYiUuWGGmZsZSEWycJyaxzmmcQ3N6qXpRYF8QaPUC+brfujaWSs7tMRg=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1777230577; c=relaxed/simple;\n\tbh=Ui1185AFfkku0MdzhMjt01W74TSAjdA+/L8qfGI0kN8=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=no8bkvgq1wgprVxmtH43Xhu+YtHPMHs1u0lZHSXVYHj7gGH9GPqMKyBnnHbx0Rq6PyQlqndpYTIXKExKs7SbhP4u8+ZWiQ6nQIrcZiT36XBKDpqQcx0kYLP2VDdAN4kdaqP9rMrCnuY9nT9vymK88PLa3gu7+CMsWLS2Z/0YgCE=", "ARC-Authentication-Results": "i=1; smtp.subspace.kernel.org;\n dmarc=pass (p=reject dis=none) header.from=philpem.me.uk;\n spf=pass smtp.mailfrom=philpem.me.uk;\n dkim=pass (1024-bit key) header.d=philpem.me.uk header.i=@philpem.me.uk\n header.b=Pkei29j5; arc=none smtp.client-ip=178.62.38.78", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=philpem.me.uk;\n\ts=mail; t=1777230569;\n\tbh=Ui1185AFfkku0MdzhMjt01W74TSAjdA+/L8qfGI0kN8=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=Pkei29j5i5ZucIfwkkAACnm9l1S1pPwvoyUKla9oyvWTeFXZOgjqL/UvNjqynjGyE\n\t nYke2/RxVlWmc6G7LM9IZ5YkVH5pfWh2r/7nL2DXeNE5tLqB5A8k7YPLFWX6wAN/bK\n\t VoXJJHOZGhYJQ0ZtPE499mEEmkHK+Y37YgVbtk0E=", "From": "Phil Pemberton <philpem@philpem.me.uk>", "To": "linux-ide@vger.kernel.org,\n\tlinux-scsi@vger.kernel.org", "Cc": "linux-kernel@vger.kernel.org,\n\tDamien Le Moal <dlemoal@kernel.org>,\n\tNiklas Cassel <cassel@kernel.org>,\n\t\"James E . J . Bottomley\" <James.Bottomley@HansenPartnership.com>,\n\t\"Martin K . Petersen\" <martin.petersen@oracle.com>,\n\tHannes Reinecke <hare@suse.de>,\n\tPhil Pemberton <philpem@philpem.me.uk>", "Subject": "[PATCH v3 1/7] ata: libata-scsi: add atapi_max_lun module parameter", "Date": "Sun, 26 Apr 2026 20:09:14 +0100", "Message-ID": "<20260426190920.2051289-2-philpem@philpem.me.uk>", "X-Mailer": "git-send-email 2.43.0", "In-Reply-To": "<20260426190920.2051289-1-philpem@philpem.me.uk>", "References": "<20260426190920.2051289-1-philpem@philpem.me.uk>", "Precedence": "bulk", "X-Mailing-List": "linux-ide@vger.kernel.org", "List-Id": "<linux-ide.vger.kernel.org>", "List-Subscribe": "<mailto:linux-ide+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-ide+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit" }, "content": "Until now libata has hard-coded shost->max_lun = 1 for every ATA host,\nso the SCSI layer never scans past LUN 0. This blocks support for\nthe small handful of multi-LUN ATAPI devices (Panasonic LF-1195C and\nCOMPAQ PD-1 PD/CD combos export CD on LUN 0 and PD on LUN 1; old\nNakamichi MJ-x.y CD changers expose one LUN per disc slot, up to 7).\n\nIntroduce a libata module parameter, atapi_max_lun, that controls the\nupper bound of the per-host SCSI LUN scan. Default is 1, preserving\ncurrent behaviour exactly: out-of-the-box only LUN 0 is scanned.\nRange is clamped to 1..ATAPI_MAX_LUN (8, the SCSI-2 ceiling).\n\nSubsequent patches gate actual LUN>0 probing on BLIST_FORCELUN, so a\ndevice must both be on the SCSI device list (or carry the appropriate\nquirk) and run on a host whose atapi_max_lun has been raised before\nany extra LUNs are scanned.\n\nReviewed-by: Hannes Reinecke <hare@suse.de>\nSigned-off-by: Phil Pemberton <philpem@philpem.me.uk>\n---\n drivers/ata/libata-core.c | 5 +++++\n drivers/ata/libata-scsi.c | 2 +-\n drivers/ata/libata.h | 1 +\n include/linux/libata.h | 1 +\n 4 files changed, 8 insertions(+), 1 deletion(-)", "diff": "diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c\nindex 374993031895..8c279b6eb1fb 100644\n--- a/drivers/ata/libata-core.c\n+++ b/drivers/ata/libata-core.c\n@@ -122,6 +122,11 @@ int atapi_passthru16 = 1;\n module_param(atapi_passthru16, int, 0444);\n MODULE_PARM_DESC(atapi_passthru16, \"Enable ATA_16 passthru for ATAPI devices (0=off, 1=on [default])\");\n \n+int atapi_max_lun = 1;\n+module_param(atapi_max_lun, int, 0444);\n+MODULE_PARM_DESC(atapi_max_lun,\n+\t\"Maximum LUN to scan on ATAPI devices flagged BLIST_FORCELUN (1 [default] .. 7)\");\n+\n int libata_fua = 0;\n module_param_named(fua, libata_fua, int, 0444);\n MODULE_PARM_DESC(fua, \"FUA support (0=off [default], 1=on)\");\ndiff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c\nindex 3b65df914ebb..d1665305b552 100644\n--- a/drivers/ata/libata-scsi.c\n+++ b/drivers/ata/libata-scsi.c\n@@ -4620,7 +4620,7 @@ int ata_scsi_add_hosts(struct ata_host *host, const struct scsi_host_template *s\n \t\tshost->transportt = ata_scsi_transport_template;\n \t\tshost->unique_id = ap->print_id;\n \t\tshost->max_id = 16;\n-\t\tshost->max_lun = 1;\n+\t\tshost->max_lun = clamp(atapi_max_lun, 1, ATAPI_MAX_LUN);\n \t\tshost->max_channel = 1;\n \t\tshost->max_cmd_len = 32;\n \ndiff --git a/drivers/ata/libata.h b/drivers/ata/libata.h\nindex b5423b6e97de..96d804d02b99 100644\n--- a/drivers/ata/libata.h\n+++ b/drivers/ata/libata.h\n@@ -33,6 +33,7 @@ enum {\n #define ATA_PORT_TYPE_NAME\t\"ata_port\"\n \n extern int atapi_passthru16;\n+extern int atapi_max_lun;\n extern int libata_fua;\n extern int libata_noacpi;\n extern int libata_allow_tpm;\ndiff --git a/include/linux/libata.h b/include/linux/libata.h\nindex 00346ce3af5e..27b11577826e 100644\n--- a/include/linux/libata.h\n+++ b/include/linux/libata.h\n@@ -131,6 +131,7 @@ enum {\n \tATA_SHORT_PAUSE\t\t= 16,\n \n \tATAPI_MAX_DRAIN\t\t= 16 << 10,\n+\tATAPI_MAX_LUN\t\t= 8,\t/* SCSI-2 cap (LUN values 0..7) */\n \n \tATA_ALL_DEVICES\t\t= (1 << ATA_MAX_DEVICES) - 1,\n \n", "prefixes": [ "v3", "1/7" ] }