linux-kernel - [PATCH v2 1/2] hwmon: (dell-smm) Add FW

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Message-Id: <20220822174053.8750-2-W_Armin@gmx.de>
Date:   Mon, 22 Aug 2022 19:40:52 +0200
From:   Armin Wolf <W_Armin@....de>
To:     pali@...nel.org
Cc:     jdelvare@...e.com, linux@...ck-us.net, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] hwmon: (dell-smm) Add FW_BUG to SMM warning message

When a SMM call takes very long to execute, then it definitely
is a firmware bug which should be marked with FW_BUG.
Also add the number of the buggy SMM call to the warning message
so BIOS developers, etc immediately know which part of the SMM
interface is buggy.

Tested on a Dell Inspiron 3505.

Signed-off-by: Armin Wolf <W_Armin@....de>
---
 drivers/hwmon/dell-smm-hwmon.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index 7f8d95dd2717..9cac80358072 100644
--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -26,6 +26,7 @@
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/platform_device.h>
+#include <linux/printk.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/slab.h>
@@ -198,7 +199,7 @@ static int i8k_smm_func(void *par)
 		 eax, ebx, regs->eax & 0xffff, carry, duration);

 	if (duration > DELL_SMM_MAX_DURATION)
-		pr_warn_once("SMM call took %lld usecs!\n", duration);
+		pr_warn_once(FW_BUG "SMM call 0x%.4x took %lld usecs!\n", eax, duration);

 	if (carry || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
 		return -EINVAL;
--
2.30.2