--- /dev/null
+From 16d2afad820f6a16317008e82695331cfe1b6822 Mon Sep 17 00:00:00 2001
+From: Sasha Levin <sashal@kernel.org>
+Date: Tue, 14 Dec 2021 04:18:36 -0800
+Subject: platform/x86: apple-gmux: use resource_size() with res
+
+From: Wang Qing <wangqing@vivo.com>
+
+[ Upstream commit eb66fb03a727cde0ab9b1a3858de55c26f3007da ]
+
+This should be (res->end - res->start + 1) here actually,
+use resource_size() derectly.
+
+Signed-off-by: Wang Qing <wangqing@vivo.com>
+Link: https://lore.kernel.org/r/1639484316-75873-1-git-send-email-wangqing@vivo.com
+Reviewed-by: Hans de Goede <hdegoede@redhat.com>
+Signed-off-by: Hans de Goede <hdegoede@redhat.com>
+Signed-off-by: Sasha Levin <sashal@kernel.org>
+---
+ drivers/platform/x86/apple-gmux.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/drivers/platform/x86/apple-gmux.c b/drivers/platform/x86/apple-gmux.c
+index 976efeb3f2ba3..a0f10ccdca3e4 100644
+--- a/drivers/platform/x86/apple-gmux.c
++++ b/drivers/platform/x86/apple-gmux.c
+@@ -461,7 +461,7 @@ static int gmux_probe(struct pnp_dev *pnp, const struct pnp_device_id *id)
+ }
+
+ gmux_data->iostart = res->start;
+- gmux_data->iolen = res->end - res->start;
++ gmux_data->iolen = resource_size(res);
+
+ if (gmux_data->iolen < GMUX_MIN_IO_LEN) {
+ pr_err("gmux I/O region too small (%lu < %u)\n",
+--
+2.34.1
+