From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 840CA47C119; Sat, 12 Sep 2026 13:39:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789220390; cv=none; b=Bkahi0p3JH+eHFq0QfhNULlgatPGDAeJyksDz9hzdGjHXvy5THEAwzsWtVJsAX4xYHQHHd40qXYPke1p2Zlu1J+OpIO3JSeJBntAkTzlZI85xg5dpKU4wRVwganuaNIsuuClpw7dgUrKTiKtO7nN4H7SmKLM90SjPugnFpxaWNQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789220390; c=relaxed/simple; bh=QA+5zt/7jGbWiHIZpWwxLjr/5mBM5BwqOJ18IENRIz0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kNduQKXYFk2/jzQFM7+LW4e2+6NDj3uu7rOkRcF2IFN+AyVJoY78BKwdJWLsdbz1A3RLFtrpo6hvmL28+fC3q+Eg7AeAXRbAxpHYN5IhQK4aWQpUdGk3E1GU1cdDZhiTR0SHxhDhYzoNLR8FKQXRrH2knhL4XsPc+XdC1WeB0/g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=IYSN7uk9; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="IYSN7uk9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3CC6A1F000FF; Sat, 12 Sep 2026 13:39:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789220389; bh=xaJ7FjdYLxXb3CqIdy7MaSL3gBgrKESpBiwh5P3d0c0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=IYSN7uk9nwbiDRk2/ArhWaaSMXbmCaKtJGiUfk7nFXDEv7anOESStmxkPBUgksV/7 WdTgZo3NHYrLp7GNJHuxPQLsk+Bjf6Hqp8NAhEvJ2te11D+grELSnYtnZo2qt1D3wi /324rCZMAGjE1TK/Nvzkv7UZx4N23oAN9gEVqwQk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Hannes Reinecke , Niklas Cassel , Damien Le Moal Subject: [PATCH 6.6 0115/1424] ata: libata-scsi: fix DSM TRIM for sector sizes larger than 2048 bytes Date: Sat, 12 Sep 2026 08:42:27 +0200 Message-ID: <20260912065609.879097217@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065607.279695368@linuxfoundation.org> References: <20260912065607.279695368@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Niklas Cassel commit 79cce911e623c0baa0fde307ce3a434e084b881a upstream. ata_scsi_write_same_xlat() translates a SCSI WRITE SAME command with the UNMAP bit set into an ATA DATA SET MANAGEMENT TRIM command. The TRIM descriptor is built by ata_format_dsm_trim_descr() into the 2048-byte ata_scsi_rbuf staging buffer, and the number of bytes copied is compared against the logical sector size by the caller: size = ata_format_dsm_trim_descr(scmd, trmax, block, n_block); if (size != len) /* len == sdp->sector_size */ goto invalid_param_len; ata_format_dsm_trim_descr() clamps the copy length to ATA_SCSI_RBUF_SIZE (2048). On a device whose logical sector size exceeds that (e.g. a 4Kn device, where sector_size == 4096) the function can never return more than 2048, while the caller expects it to return sector_size. The comparison therefore always fails, so every TRIM is rejected with "Parameter list length error" and WARN_ON() splats on each attempt. TRIM / discard is thus completely broken on such devices. The descriptor was incorrectly sized from the logical sector size. A DSM TRIM payload is a list of 512-byte pages, each holding up to ATA_MAX_TRIM_RNUM (64) LBA Range Entries, and is independent of the logical sector size. The Block Limits VPD page already advertises a single such page as the maximum WRITE SAME length (65535 * ATA_MAX_TRIM_RNUM logical blocks), so the block layer never sends a request that needs more than one page. Emit exactly one 512-byte page, independent of the logical sector size, and transfer only that page (COUNT == 1). For a 512-byte-sector device this is unchanged; devices with larger logical sectors now work instead of failing every TRIM. Reviewed-by: Hannes Reinecke Fixes: ef2d7392c4ec ("libata: SCT Write Same / DSM Trim") Cc: stable@vger.kernel.org Signed-off-by: Niklas Cassel Signed-off-by: Damien Le Moal Signed-off-by: Greg Kroah-Hartman --- drivers/ata/libata-scsi.c | 28 ++++++++++++++-------------- 1 file changed, 14 insertions(+), 14 deletions(-) --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -3222,17 +3222,13 @@ static unsigned int ata_scsi_pass_thru(s static size_t ata_format_dsm_trim_descr(struct scsi_cmnd *cmd, u32 trmax, u64 sector, u32 count) { - struct scsi_device *sdp = cmd->device; - size_t len = sdp->sector_size; + size_t len = ATA_SECT_SIZE; size_t r; __le64 *buf; u32 i = 0; unsigned long flags; - WARN_ON(len > ATA_SCSI_RBUF_SIZE); - - if (len > ATA_SCSI_RBUF_SIZE) - len = ATA_SCSI_RBUF_SIZE; + BUILD_BUG_ON(ATA_SECT_SIZE > ATA_SCSI_RBUF_SIZE); spin_lock_irqsave(&ata_scsi_rbuf_lock, flags); buf = ((void *)ata_scsi_rbuf); @@ -3267,13 +3263,11 @@ static unsigned int ata_scsi_write_same_ { struct ata_taskfile *tf = &qc->tf; struct scsi_cmnd *scmd = qc->scsicmd; - struct scsi_device *sdp = scmd->device; - size_t len = sdp->sector_size; struct ata_device *dev = qc->dev; const u8 *cdb = scmd->cmnd; u64 block; u32 n_block; - const u32 trmax = len >> 3; + const u32 trmax = ATA_MAX_TRIM_RNUM; u32 size; u16 fp; u8 bp = 0xff; @@ -3318,13 +3312,13 @@ static unsigned int ata_scsi_write_same_ goto invalid_param_len; /* - * size must match sector size in bytes - * For DATA SET MANAGEMENT TRIM in ACS-2 nsect (aka count) - * is defined as number of 512 byte blocks to be transferred. + * The TRIM descriptor is a single 512-byte page, which is the maximum + * WRITE SAME length advertised in the Block Limits VPD page. For DATA + * SET MANAGEMENT TRIM the COUNT field (aka nsect) is the number of + * 512-byte blocks to be transferred. */ - size = ata_format_dsm_trim_descr(scmd, trmax, block, n_block); - if (size != len) + if (size != ATA_SECT_SIZE) goto invalid_param_len; if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) { @@ -3350,6 +3344,12 @@ static unsigned int ata_scsi_write_same_ ATA_TFLAG_WRITE; ata_qc_set_pc_nbytes(qc); + /* + * The DSM TRIM payload is a single 512-byte page, which may be smaller + * than the WRITE SAME data-out buffer (one logical block); only + * transfer that page so the length matches the COUNT field. + */ + qc->nbytes = size; return 0;