linux-kernel - [PATCH] OPP: debugfs: Use performance level to distinguish between rates

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20260129173310.7241-1-manivannan.sadhasivam@oss.qualcomm.com>
Date: Thu, 29 Jan 2026 23:03:10 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
To: vireshk@...nel.org, nm@...com, sboyd@...nel.org
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>,
        Bjorn Andersson <andersson@...nel.org>
Subject: [PATCH] OPP: debugfs: Use performance level to distinguish between rates

Some OPP tables have entries with same rate and different performance
level. For these entries, using only the rate as the debugfs directory name
causes below error:

debugfs: 'opp:5000000' already exists in 'soc@...c00000.pci'

Fix it by appending the performance level to the dir name.

Reported-by: Bjorn Andersson <andersson@...nel.org>
Closes: https://lore.kernel.org/linux-arm-msm/75lzykd37zdvrks5i2bb4zb2yzjtm25kv3hegmikndkbr772mz@w2ykff3ny45u/
Fixes: 05db35963eef ("OPP: Add support to find OPP for a set of keys")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
---
 drivers/opp/debugfs.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/opp/debugfs.c b/drivers/opp/debugfs.c
index 8fc6238b1728..7c912bae2a5a 100644
--- a/drivers/opp/debugfs.c
+++ b/drivers/opp/debugfs.c
@@ -131,21 +131,24 @@ void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
 	struct dentry *pdentry = opp_table->dentry;
 	struct dentry *d;
 	unsigned long id;
-	char name[25];	/* 20 chars for 64 bit value + 5 (opp:\0) */
+	char name[36];	/* "opp:"(4) + u64(20) + "-" (1) + u32(10) + NULL(1) */
 
 	/*
 	 * Get directory name for OPP.
 	 *
-	 * - Normally rate is unique to each OPP, use it to get unique opp-name.
+	 * - Normally rate is unique to each OPP, use it to get unique opp-name,
+	 *   together with performance level.
 	 * - For some devices rate isn't available or there are multiple, use
 	 *   index instead for them.
 	 */
-	if (likely(opp_table->clk_count == 1 && opp->rates[0]))
+	if (likely(opp_table->clk_count == 1 && opp->rates[0])) {
 		id = opp->rates[0];
-	else
+		snprintf(name, sizeof(name), "opp:%lu-%u", id, opp->level);
+	} else {
 		id = _get_opp_count(opp_table);
+		snprintf(name, sizeof(name), "opp:%lu", id);
+	}
 
-	snprintf(name, sizeof(name), "opp:%lu", id);
 
 	/* Create per-opp directory */
 	d = debugfs_create_dir(name, pdentry);
-- 
2.51.0