linux-kernel - [PATCH] gpio: ws16c48: Fix off-by-one error in WS16C48 resource region extent

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Message-Id: <20230228081126.94280-1-william.gray@linaro.org>
Date:   Tue, 28 Feb 2023 03:11:26 -0500
From:   William Breathitt Gray <william.gray@...aro.org>
To:     linus.walleij@...aro.org, brgl@...ev.pl
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        techsupport@...systems.com, stable@...r.kernel.org,
        William Breathitt Gray <william.gray@...aro.org>,
        Paul Demetrotion <pdemetrotion@...systems.com>
Subject: [PATCH] gpio: ws16c48: Fix off-by-one error in WS16C48 resource region extent

The WinSystems WS16C48 I/O address region spans offsets 0x0 through 0xA,
which is a total of 11 bytes. Fix the WS16C48_EXTENT define to the
correct value of 11 so that access to necessary device registers is
properly requested in the ws16c48_probe() callback by the
devm_request_region() function call.

Fixes: 2c05a0f29f41 ("gpio: ws16c48: Implement and utilize register structures")
Cc: Paul Demetrotion <pdemetrotion@...systems.com>
Signed-off-by: William Breathitt Gray <william.gray@...aro.org>
---
 drivers/gpio/gpio-ws16c48.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-ws16c48.c b/drivers/gpio/gpio-ws16c48.c
index e73885a4dc32..afb42a8e916f 100644
--- a/drivers/gpio/gpio-ws16c48.c
+++ b/drivers/gpio/gpio-ws16c48.c
@@ -18,7 +18,7 @@
 #include <linux/spinlock.h>
 #include <linux/types.h>
 
-#define WS16C48_EXTENT 10
+#define WS16C48_EXTENT 11
 #define MAX_NUM_WS16C48 max_num_isa_dev(WS16C48_EXTENT)
 
 static unsigned int base[MAX_NUM_WS16C48];

base-commit: 4827aae061337251bb91801b316157a78b845ec7
-- 
2.39.2