From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B6DBEC46467 for ; Fri, 1 Apr 2022 15:20:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352088AbiDAPTi (ORCPT ); Fri, 1 Apr 2022 11:19:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60394 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1352535AbiDAOu1 (ORCPT ); Fri, 1 Apr 2022 10:50:27 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C73472B3330; Fri, 1 Apr 2022 07:41:53 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 8BAD3611E4; Fri, 1 Apr 2022 14:40:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0A424C340F2; Fri, 1 Apr 2022 14:40:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1648824048; bh=CwQowb1XNFLdS/UPwZLTXi+3ITKGQlT2Hr0iMUTfAk4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dIruksJDz5pqURNaB6YUntqfSY5dBib7htNGK1YEnch2DY1fUyfUqRBLLbOtKuQ7G CsXlDYSGRS1LwmUgc8Q10inACxJsqjYNs1jaxaM5KxrSqIqkNvnh0jdvOzWnkQuLnb nnazyx50PvssTTaMvn6Dj73ev83JwWbVeUp0L81nl62OvjVhIXEqkAzFMVOiLUrU7L u7fjKCiOsOZcZDN0ObnjgZy/qryy9d7d4x3VCeoiaVJOVRyY4O/E25mo+DozWakGF7 sxQCsrNCIJF2RrTL9iRc5dLeQ3BF1130/zNTyPb0pO/lNlwnzAubEINYYChmrQLH7T mvu7fWAe8ypQw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Xiang Chen , Qi Liu , John Garry , "Martin K . Petersen" , Sasha Levin , jejb@linux.ibm.com, linux-scsi@vger.kernel.org Subject: [PATCH AUTOSEL 5.15 64/98] scsi: hisi_sas: Limit users changing debugfs BIST count value Date: Fri, 1 Apr 2022 10:37:08 -0400 Message-Id: <20220401143742.1952163-64-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220401143742.1952163-1-sashal@kernel.org> References: <20220401143742.1952163-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Xiang Chen [ Upstream commit 286ce4c65fbdf5eb9d4d5f4e4997c4e32bf1b073 ] Add a file operation for "cnt" file under bist directory, so users can only read "cnt" or clear "cnt" to zero, but cannot randomly modify. Link: https://lore.kernel.org/r/1645703489-87194-6-git-send-email-john.garry@huawei.com Signed-off-by: Xiang Chen Signed-off-by: Qi Liu Signed-off-by: John Garry Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 52 +++++++++++++++++++++++++- 1 file changed, 50 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c index fd14f66c71df..299a22ab5bc9 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c +++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c @@ -3968,6 +3968,54 @@ static const struct file_operations debugfs_bist_phy_v3_hw_fops = { .owner = THIS_MODULE, }; +static ssize_t debugfs_bist_cnt_v3_hw_write(struct file *filp, + const char __user *buf, + size_t count, loff_t *ppos) +{ + struct seq_file *m = filp->private_data; + struct hisi_hba *hisi_hba = m->private; + unsigned int cnt; + int val; + + if (hisi_hba->debugfs_bist_enable) + return -EPERM; + + val = kstrtouint_from_user(buf, count, 0, &cnt); + if (val) + return val; + + if (cnt) + return -EINVAL; + + hisi_hba->debugfs_bist_cnt = 0; + return count; +} + +static int debugfs_bist_cnt_v3_hw_show(struct seq_file *s, void *p) +{ + struct hisi_hba *hisi_hba = s->private; + + seq_printf(s, "%u\n", hisi_hba->debugfs_bist_cnt); + + return 0; +} + +static int debugfs_bist_cnt_v3_hw_open(struct inode *inode, + struct file *filp) +{ + return single_open(filp, debugfs_bist_cnt_v3_hw_show, + inode->i_private); +} + +static const struct file_operations debugfs_bist_cnt_v3_hw_ops = { + .open = debugfs_bist_cnt_v3_hw_open, + .read = seq_read, + .write = debugfs_bist_cnt_v3_hw_write, + .llseek = seq_lseek, + .release = single_release, + .owner = THIS_MODULE, +}; + static const struct { int value; char *name; @@ -4605,8 +4653,8 @@ static void debugfs_bist_init_v3_hw(struct hisi_hba *hisi_hba) debugfs_create_file("phy_id", 0600, hisi_hba->debugfs_bist_dentry, hisi_hba, &debugfs_bist_phy_v3_hw_fops); - debugfs_create_u32("cnt", 0600, hisi_hba->debugfs_bist_dentry, - &hisi_hba->debugfs_bist_cnt); + debugfs_create_file("cnt", 0600, hisi_hba->debugfs_bist_dentry, + hisi_hba, &debugfs_bist_cnt_v3_hw_ops); debugfs_create_file("loopback_mode", 0600, hisi_hba->debugfs_bist_dentry, -- 2.34.1