linux-kernel - [PATCH 2/5] hwmon/lm78: Drop REALLY_SLOW

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Message-ID: <20251126162018.5676-3-jgross@suse.com>
Date: Wed, 26 Nov 2025 17:20:15 +0100
From: Juergen Gross <jgross@...e.com>
To: linux-kernel@...r.kernel.org,
	linux-hwmon@...r.kernel.org
Cc: Juergen Gross <jgross@...e.com>,
	Jean Delvare <jdelvare@...e.com>,
	Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 2/5] hwmon/lm78: Drop REALLY_SLOW_IO setting

In lm78_isa_found() there is REALLY_SLOW_IO defined around some port
accesses, probably in order to wait between multiple accesses.

Unfortunately this isn't making any difference compared to not having
this define since more than a decade, as REALLY_SLOW_IO needs to be
defined while "#include <asm/io.h>" is called to have an effect.

As there seem not to be any outstanding issues in spite of this having
no effect, just drop the "#define" and add a remark to the related
comment.

Signed-off-by: Juergen Gross <jgross@...e.com>
---
 drivers/hwmon/lm78.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/lm78.c b/drivers/hwmon/lm78.c
index 8b53bb312069..9378a47bf5af 100644
--- a/drivers/hwmon/lm78.c
+++ b/drivers/hwmon/lm78.c
@@ -843,17 +843,18 @@ static int __init lm78_isa_found(unsigned short address)
 		}
 	}
 
-#define REALLY_SLOW_IO
 	/*
 	 * We need the timeouts for at least some LM78-like
 	 * chips. But only if we read 'undefined' registers.
+	 * There used to be a "#define REALLY_SLOW_IO" to enforce that, but
+	 * this has been without any effect since more than a decade, so it
+	 * has been dropped.
 	 */
 	val = inb_p(address + 1);
 	if (inb_p(address + 2) != val
 	 || inb_p(address + 3) != val
 	 || inb_p(address + 7) != val)
 		goto release;
-#undef REALLY_SLOW_IO
 
 	/*
 	 * We should be able to change the 7 LSB of the address port. The
-- 
2.51.0