[{"id":3682449,"web_url":"http://patchwork.ozlabs.org/comment/3682449/","msgid":"<38a4a44f-fe8e-4236-8a6e-daff8dd16f48@kernel.org>","list_archive_url":null,"date":"2026-04-26T23:32:41","subject":"Re: [PATCH v3 4/7] scsi: add BLIST_NO_LUN_1F blacklist flag","submitter":{"id":86188,"url":"http://patchwork.ozlabs.org/api/people/86188/","name":"Damien Le Moal","email":"dlemoal@kernel.org"},"content":"On 4/27/26 4:09 AM, Phil Pemberton wrote:\n> Some multi-LUN devices respond to INQUIRY on unpopulated LUNs with\n> PQ=0 / PDT=0x1f instead of the standard PQ=3.  The SCSI scan layer\n> normally adds such devices (PQ=0 means \"connected\"), producing\n> spurious \"No Device\" entries.\n> \n> The scsi_target field pdt_1f_for_no_lun already exists to suppress\n> this, but was previously only set by the USB UFI driver.\n> \n> Add BLIST_NO_LUN_1F so the flag can be set per-device from\n> scsi_devinfo, and wire it up in scsi_add_lun() to set\n> starget->pdt_1f_for_no_lun from the blacklist flags.  This runs\n> during LUN 0 processing, before the sequential LUN scan probes\n> higher LUNs.\n> \n> Signed-off-by: Phil Pemberton <philpem@philpem.me.uk>\n> ---\n>  drivers/scsi/scsi_scan.c    | 3 +++\n>  include/scsi/scsi_devinfo.h | 6 +++---\n>  2 files changed, 6 insertions(+), 3 deletions(-)\n> \n> diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c\n> index 7b11bc7de0e3..d3f0540d79a2 100644\n> --- a/drivers/scsi/scsi_scan.c\n> +++ b/drivers/scsi/scsi_scan.c\n> @@ -1070,6 +1070,9 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,\n>  \n>  \tsdev->sdev_bflags = *bflags;\n>  \n> +\tif (*bflags & BLIST_NO_LUN_1F)\n\nInstead of dereferencing again bflags, maybe use sdev->sdev_bflags here ?\nI would also remove the blank line before this if.\n\nWith that, looks OK to me.\n\nReviewed-by: Damien Le Moal <dlemoal@kernel.org>\n\n> +\t\tsdev->sdev_target->pdt_1f_for_no_lun = 1;\n> +\n>  \tif (scsi_device_is_pseudo_dev(sdev))\n>  \t\treturn SCSI_SCAN_LUN_PRESENT;\n>  \n> diff --git a/include/scsi/scsi_devinfo.h b/include/scsi/scsi_devinfo.h\n> index 1d79a3b536ce..6957b0705510 100644\n> --- a/include/scsi/scsi_devinfo.h\n> +++ b/include/scsi/scsi_devinfo.h\n> @@ -34,7 +34,8 @@\n>  #define BLIST_NOSTARTONADD\t((__force blist_flags_t)(1ULL << 12))\n>  /* do not ask for VPD page size first on some broken targets */\n>  #define BLIST_NO_VPD_SIZE\t((__force blist_flags_t)(1ULL << 13))\n> -#define __BLIST_UNUSED_14\t((__force blist_flags_t)(1ULL << 14))\n> +/* PDT 0x1f with PQ 0 means no LUN present (e.g. some ATAPI multi-LUN) */\n> +#define BLIST_NO_LUN_1F\t\t((__force blist_flags_t)(1ULL << 14))\n>  #define __BLIST_UNUSED_15\t((__force blist_flags_t)(1ULL << 15))\n>  #define __BLIST_UNUSED_16\t((__force blist_flags_t)(1ULL << 16))\n>  /* try REPORT_LUNS even for SCSI-2 devs (if HBA supports more than 8 LUNs) */\n> @@ -77,8 +78,7 @@\n>  #define __BLIST_HIGH_UNUSED (~(__BLIST_LAST_USED | \\\n>  \t\t\t       (__force blist_flags_t) \\\n>  \t\t\t       ((__force __u64)__BLIST_LAST_USED - 1ULL)))\n> -#define __BLIST_UNUSED_MASK (__BLIST_UNUSED_14 | \\\n> -\t\t\t     __BLIST_UNUSED_15 | \\\n> +#define __BLIST_UNUSED_MASK (__BLIST_UNUSED_15 | \\\n>  \t\t\t     __BLIST_UNUSED_16 | \\\n>  \t\t\t     __BLIST_UNUSED_24 | \\\n>  \t\t\t     __BLIST_UNUSED_27 | \\","headers":{"Return-Path":"\n <linux-ide+bounces-5545-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 (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=BJqnqsp9;\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; 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J . Bottomley\" <James.Bottomley@HansenPartnership.com>,\n \"Martin K . Petersen\" <martin.petersen@oracle.com>,\n Hannes Reinecke <hare@suse.de>","References":"<20260426190920.2051289-1-philpem@philpem.me.uk>\n <20260426190920.2051289-5-philpem@philpem.me.uk>","Content-Language":"en-US","From":"Damien Le Moal <dlemoal@kernel.org>","Organization":"Western Digital Research","In-Reply-To":"<20260426190920.2051289-5-philpem@philpem.me.uk>","Content-Type":"text/plain; charset=UTF-8","Content-Transfer-Encoding":"7bit"}},{"id":3682662,"web_url":"http://patchwork.ozlabs.org/comment/3682662/","msgid":"<f654611e-5621-463d-a8be-c963f63f7155@suse.de>","list_archive_url":null,"date":"2026-04-27T11:54:15","subject":"Re: [PATCH v3 4/7] scsi: add BLIST_NO_LUN_1F blacklist flag","submitter":{"id":992,"url":"http://patchwork.ozlabs.org/api/people/992/","name":"Hannes Reinecke","email":"hare@suse.de"},"content":"On 4/26/26 21:09, Phil Pemberton wrote:\n> Some multi-LUN devices respond to INQUIRY on unpopulated LUNs with\n> PQ=0 / PDT=0x1f instead of the standard PQ=3.  The SCSI scan layer\n> normally adds such devices (PQ=0 means \"connected\"), producing\n> spurious \"No Device\" entries.\n> \n> The scsi_target field pdt_1f_for_no_lun already exists to suppress\n> this, but was previously only set by the USB UFI driver.\n> \n> Add BLIST_NO_LUN_1F so the flag can be set per-device from\n> scsi_devinfo, and wire it up in scsi_add_lun() to set\n> starget->pdt_1f_for_no_lun from the blacklist flags.  This runs\n> during LUN 0 processing, before the sequential LUN scan probes\n> higher LUNs.\n> \n> Signed-off-by: Phil Pemberton <philpem@philpem.me.uk>\n> ---\n>   drivers/scsi/scsi_scan.c    | 3 +++\n>   include/scsi/scsi_devinfo.h | 6 +++---\n>   2 files changed, 6 insertions(+), 3 deletions(-)\n> \n> diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c\n> index 7b11bc7de0e3..d3f0540d79a2 100644\n> --- a/drivers/scsi/scsi_scan.c\n> +++ b/drivers/scsi/scsi_scan.c\n> @@ -1070,6 +1070,9 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,\n>   \n>   \tsdev->sdev_bflags = *bflags;\n>   \n> +\tif (*bflags & BLIST_NO_LUN_1F)\n> +\t\tsdev->sdev_target->pdt_1f_for_no_lun = 1;\n> +\n>   \tif (scsi_device_is_pseudo_dev(sdev))\n>   \t\treturn SCSI_SCAN_LUN_PRESENT;\n>   \n> diff --git a/include/scsi/scsi_devinfo.h b/include/scsi/scsi_devinfo.h\n> index 1d79a3b536ce..6957b0705510 100644\n> --- a/include/scsi/scsi_devinfo.h\n> +++ b/include/scsi/scsi_devinfo.h\n> @@ -34,7 +34,8 @@\n>   #define BLIST_NOSTARTONADD\t((__force blist_flags_t)(1ULL << 12))\n>   /* do not ask for VPD page size first on some broken targets */\n>   #define BLIST_NO_VPD_SIZE\t((__force blist_flags_t)(1ULL << 13))\n> -#define __BLIST_UNUSED_14\t((__force blist_flags_t)(1ULL << 14))\n> +/* PDT 0x1f with PQ 0 means no LUN present (e.g. some ATAPI multi-LUN) */\n> +#define BLIST_NO_LUN_1F\t\t((__force blist_flags_t)(1ULL << 14))\n>   #define __BLIST_UNUSED_15\t((__force blist_flags_t)(1ULL << 15))\n>   #define __BLIST_UNUSED_16\t((__force blist_flags_t)(1ULL << 16))\n>   /* try REPORT_LUNS even for SCSI-2 devs (if HBA supports more than 8 LUNs) */\n> @@ -77,8 +78,7 @@\n>   #define __BLIST_HIGH_UNUSED (~(__BLIST_LAST_USED | \\\n>   \t\t\t       (__force blist_flags_t) \\\n>   \t\t\t       ((__force __u64)__BLIST_LAST_USED - 1ULL)))\n> -#define __BLIST_UNUSED_MASK (__BLIST_UNUSED_14 | \\\n> -\t\t\t     __BLIST_UNUSED_15 | \\\n> +#define __BLIST_UNUSED_MASK (__BLIST_UNUSED_15 | \\\n>   \t\t\t     __BLIST_UNUSED_16 | \\\n>   \t\t\t     __BLIST_UNUSED_24 | \\\n>   \t\t\t     __BLIST_UNUSED_27 | \\\n\nMuch better.\n\nReviewed-by: Hannes Reinecke <hare@suse.de>\n\nCheers,\n\nHannes","headers":{"Return-Path":"\n <linux-ide+bounces-5560-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=suse.de header.i=@suse.de header.a=rsa-sha256\n header.s=susede2_rsa header.b=j6uDjtJz;\n\tdkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=fDgyN16l;\n\tdkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de\n header.a=rsa-sha256 header.s=susede2_rsa header.b=j6uDjtJz;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=fDgyN16l;\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; 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