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 63CB8568FB6; Wed, 9 Sep 2026 14:07:56 +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=1788962878; cv=none; b=s1qKXoet6BKVKjCUmkHFt7t0uYH+BszbIrcNCwSHErmGen9ItGyCs8ofFg1ChBk74iRe6SOGDA5Ucdu5sdPyjIMgwJgeK3FNfcJyJWYEzDrC8RHnPMM4zcJXsvxXvEFkD0/eIDazMIN6/ltl0OCo2eQ8KEtcugoWfyOfi/FTQm8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788962878; c=relaxed/simple; bh=IlrueyZGZdHDvDt9wWDLleTi9W8fRTnFX8zHcPOT/0c=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uWnu9ZQFD/WqRR3QD6xEJxSZyqhYT0xlRYDA/pgsY25juzX8D2gfAkTB+VnbqAMPtZcEU9RfU3sgF/td9c2KYHbcDp5rX50hR+WlMHv5XgDKB9xpeb/89ca1B/4HeUXD2StU+GitLkgbbJtm5JX5hlGJOxnzhdkH9iPzppz+4tE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=GLHz3tBU; 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="GLHz3tBU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 339C11F00A3E; Wed, 9 Sep 2026 14:07:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788962876; bh=+aTIdyUJs8OqGt5XYGUHeGzGrncT3A7utA6dTBOAms0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=GLHz3tBUP258TM02Q5I1LM34VhVyGuN1B7yxNy/sR8d5B4b0yQ0dend7CZ+SlFuWa YiizczljZlMn09wsYLRSq6lBsHGX7saiHmR4hv9rEUHoGKfTso7MdopMpRffUW1KqQ 03t9Juf/9FBKRrl1IWiXX9nBn/3ABkzxyeR21Qlg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sashiko , Nilesh Javali , "Martin K. Petersen (Oracle)" Subject: [PATCH 7.2 443/556] scsi: qla2xxx: Use coherent DMA buffer for D_Port diagnostics Date: Wed, 9 Sep 2026 15:42:03 +0200 Message-ID: <20260909134246.186776540@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260909134230.441546314@linuxfoundation.org> References: <20260909134230.441546314@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 7.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Nilesh Javali commit 7c4f3f50d83af4545efaa99b3d0d46fb8d52031e upstream. qla26xx_dport_diagnostics() streaming-maps the caller's result buffer with dma_map_single(). The bsg path passes &dd->buf from the __packed struct qla_dport_diag, where buf lands at a 2-byte offset and shares cachelines with the surrounding options/unused fields. Mapping such a misaligned sub-buffer violates the DMA API requirement that streaming buffers be cacheline aligned and not share a cacheline with other data, and can corrupt data on non-DMA-coherent architectures. Allocate a dedicated DMA-coherent buffer inside qla26xx_dport_diagnostics() for the mailbox command and copy the result back into the caller's buffer. This removes the streaming map of the misaligned sub-buffer entirely; the caller's buffer is now only a plain CPU buffer, so its packing no longer matters. Fixes: ec89146215d1 ("qla2xxx: Add bsg interface to support D_Port Diagnostics.") Cc: stable@vger.kernel.org Reported-by: Sashiko Signed-off-by: Nilesh Javali Link: https://patch.msgid.link/20260730155838.2119230-29-njavali@marvell.com Signed-off-by: Martin K. Petersen (Oracle) Signed-off-by: Greg Kroah-Hartman --- drivers/scsi/qla2xxx/qla_mbx.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) --- a/drivers/scsi/qla2xxx/qla_mbx.c +++ b/drivers/scsi/qla2xxx/qla_mbx.c @@ -6499,6 +6499,7 @@ qla26xx_dport_diagnostics(scsi_qla_host_ mbx_cmd_t mc; mbx_cmd_t *mcp = &mc; dma_addr_t dd_dma; + void *dd; if (!IS_QLA83XX(vha->hw) && !IS_QLA27XX(vha->hw) && !IS_QLA28XX(vha->hw)) @@ -6507,15 +6508,12 @@ qla26xx_dport_diagnostics(scsi_qla_host_ ql_dbg(ql_dbg_mbx + ql_dbg_verbose, vha, 0x119f, "Entered %s.\n", __func__); - dd_dma = dma_map_single(&vha->hw->pdev->dev, - dd_buf, size, DMA_FROM_DEVICE); - if (dma_mapping_error(&vha->hw->pdev->dev, dd_dma)) { - ql_log(ql_log_warn, vha, 0x1194, "Failed to map dma buffer.\n"); + dd = dma_alloc_coherent(&vha->hw->pdev->dev, size, &dd_dma, GFP_KERNEL); + if (!dd) { + ql_log(ql_log_warn, vha, 0x1194, "Failed to allocate dma buffer.\n"); return QLA_MEMORY_ALLOC_FAILED; } - memset(dd_buf, 0, size); - mcp->mb[0] = MBC_DPORT_DIAGNOSTICS; mcp->mb[1] = options; mcp->mb[2] = MSW(LSD(dd_dma)); @@ -6537,8 +6535,9 @@ qla26xx_dport_diagnostics(scsi_qla_host_ "Done %s.\n", __func__); } - dma_unmap_single(&vha->hw->pdev->dev, dd_dma, - size, DMA_FROM_DEVICE); + memcpy(dd_buf, dd, size); + + dma_free_coherent(&vha->hw->pdev->dev, size, dd, dd_dma); return rval; }