linux-kernel - [PATCH] soundwire: stream: fix programming slave ports for non-continous port maps

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Message-ID: <20240729140157.326450-1-krzysztof.kozlowski@linaro.org>
Date: Mon, 29 Jul 2024 16:01:57 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Vinod Koul <vkoul@...nel.org>,
	Bard Liao <yung-chuan.liao@...ux.intel.com>,
	Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
	Sanyog Kale <sanyog.r.kale@...el.com>,
	Shreyas NC <shreyas.nc@...el.com>,
	alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	stable@...r.kernel.org
Subject: [PATCH] soundwire: stream: fix programming slave ports for non-continous port maps

Two bitmasks in 'struct sdw_slave_prop' - 'source_ports' and
'sink_ports' - define which ports to program in
sdw_program_slave_port_params().  The masks are used to get the
appropriate data port properties ('struct sdw_get_slave_dpn_prop') from
an array.

Bitmasks can be non-continuous or can start from index different than 0,
thus when looking for matching port property for given port, we must
iterate over mask bits, not from 0 up to number of ports.

This fixes allocation and programming slave ports, when a source or sink
masks start from further index.

Fixes: f8101c74aa54 ("soundwire: Add Master and Slave port programming")
Cc: <stable@...r.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 drivers/soundwire/stream.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
index 7aa4900dcf31..f275143d7b18 100644
--- a/drivers/soundwire/stream.c
+++ b/drivers/soundwire/stream.c
@@ -1291,18 +1291,18 @@ struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
 					    unsigned int port_num)
 {
 	struct sdw_dpn_prop *dpn_prop;
-	u8 num_ports;
+	unsigned long mask;
 	int i;
 
 	if (direction == SDW_DATA_DIR_TX) {
-		num_ports = hweight32(slave->prop.source_ports);
+		mask = slave->prop.source_ports;
 		dpn_prop = slave->prop.src_dpn_prop;
 	} else {
-		num_ports = hweight32(slave->prop.sink_ports);
+		mask = slave->prop.sink_ports;
 		dpn_prop = slave->prop.sink_dpn_prop;
 	}
 
-	for (i = 0; i < num_ports; i++) {
+	for_each_set_bit(i, &mask, 32) {
 		if (dpn_prop[i].num == port_num)
 			return &dpn_prop[i];
 	}
-- 
2.43.0