linux-kernel - [PATCH 6.6 11/14] thunderbolt: Introduce tb_switch

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Message-Id: <20241001173109.1513-12-alexandru.gagniuc@hp.com>
Date: Tue,  1 Oct 2024 17:31:06 +0000
From: Alexandru Gagniuc <alexandru.gagniuc@...com>
To: gregkh@...uxfoundation.org,
	stable@...r.kernel.org
Cc: qin.wan@...com,
	andreas.noever@...il.com,
	michael.jamet@...el.com,
	mika.westerberg@...ux.intel.com,
	YehezkelShB@...il.com,
	linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Alexandru Gagniuc <alexandru.gagniuc@...com>
Subject: [PATCH 6.6 11/14] thunderbolt: Introduce tb_switch_depth()

From: Mika Westerberg <mika.westerberg@...ux.intel.com>

[ Upstream commit c4ff14436952c3d0dd05769d76cf48e73a253b48 ]

This is useful helper to find out the depth of a connected router.
Convert the existing users to call this helper instead of open-coding.

No functional changes.

Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Signed-off-by: Qin Wan <qin.wan@...com>
Signed-off-by: Alexandru Gagniuc <alexandru.gagniuc@...com>
---
 drivers/thunderbolt/tb.c | 4 ++--
 drivers/thunderbolt/tb.h | 9 +++++++++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index 4ea0536ec5cf..39ec8da576ef 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -255,13 +255,13 @@ static int tb_enable_clx(struct tb_switch *sw)
 	 * this in the future to cover the whole topology if it turns
 	 * out to be beneficial.
 	 */
-	while (sw && sw->config.depth > 1)
+	while (sw && tb_switch_depth(sw) > 1)
 		sw = tb_switch_parent(sw);
 
 	if (!sw)
 		return 0;
 
-	if (sw->config.depth != 1)
+	if (tb_switch_depth(sw) != 1)
 		return 0;
 
 	/*
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index 4cd5f48e3dee..d2ef9575231c 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -868,6 +868,15 @@ static inline struct tb_port *tb_switch_downstream_port(struct tb_switch *sw)
 	return tb_port_at(tb_route(sw), tb_switch_parent(sw));
 }
 
+/**
+ * tb_switch_depth() - Returns depth of the connected router
+ * @sw: Router
+ */
+static inline int tb_switch_depth(const struct tb_switch *sw)
+{
+	return sw->config.depth;
+}
+
 static inline bool tb_switch_is_light_ridge(const struct tb_switch *sw)
 {
 	return sw->config.vendor_id == PCI_VENDOR_ID_INTEL &&
-- 
2.45.1