linux-kernel - [PATCH v2 6/6] i2c: pasemi: Log bus reset causes

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-Id: <20250415-pasemi-fixes-v2-6-c543bf53151a@svenpeter.dev>
Date: Tue, 15 Apr 2025 15:37:00 +0000
From: Sven Peter via B4 Relay <devnull+sven.svenpeter.dev@...nel.org>
To: Janne Grunau <j@...nau.net>, Alyssa Rosenzweig <alyssa@...enzweig.io>, 
 Madhavan Srinivasan <maddy@...ux.ibm.com>, 
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, 
 Christophe Leroy <christophe.leroy@...roup.eu>, 
 Naveen N Rao <naveen@...nel.org>, Andi Shyti <andi.shyti@...nel.org>, 
 Neal Gompa <neal@...pa.dev>, Hector Martin <marcan@...can.st>
Cc: linuxppc-dev@...ts.ozlabs.org, asahi@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-i2c@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Sven Peter <sven@...npeter.dev>
Subject: [PATCH v2 6/6] i2c: pasemi: Log bus reset causes

From: Hector Martin <marcan@...can.st>

This ensures we get all information we need to debug issues when users
forward us their logs.

Signed-off-by: Hector Martin <marcan@...can.st>
Reviewed-by: Neal Gompa <neal@...pa.dev>
Reviewed-by: Alyssa Rosenzweig <alyssa@...enzweig.io>
Signed-off-by: Sven Peter <sven@...npeter.dev>
---
 drivers/i2c/busses/i2c-pasemi-core.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-pasemi-core.c b/drivers/i2c/busses/i2c-pasemi-core.c
index 41db38d82fe62c73614b8fafe4cb73c7d1a24762..e5e8a748638f02e48d6ffa65e49aff5b12f70e06 100644
--- a/drivers/i2c/busses/i2c-pasemi-core.c
+++ b/drivers/i2c/busses/i2c-pasemi-core.c
@@ -22,6 +22,7 @@
 /* Register offsets */
 #define REG_MTXFIFO	0x00
 #define REG_MRXFIFO	0x04
+#define REG_XFSTA	0x0c
 #define REG_SMSTA	0x14
 #define REG_IMASK	0x18
 #define REG_CTL		0x1c
@@ -89,7 +90,7 @@ static void pasemi_reset(struct pasemi_smbus *smbus)
 
 static int pasemi_smb_clear(struct pasemi_smbus *smbus)
 {
-	unsigned int status;
+	unsigned int status, xfstatus;
 	int ret;
 
 	/* First wait for the bus to go idle */
@@ -98,7 +99,9 @@ static int pasemi_smb_clear(struct pasemi_smbus *smbus)
 				 USEC_PER_MSEC, USEC_PER_MSEC * TRANSFER_TIMEOUT_MS);
 
 	if (ret < 0) {
-		dev_err(smbus->dev, "Bus is still stuck (status 0x%08x)\n", status);
+		xfstatus = reg_read(smbus, REG_XFSTA);
+		dev_err(smbus->dev, "Bus is still stuck (status 0x%08x xfstatus 0x%08x)\n",
+			 status, xfstatus);
 		return -EIO;
 	}
 

-- 
2.34.1