linux-kernel - [PATCH] ALSA: hda: intel-sdw-acpi: Use u8 type for link index

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Date:   Tue, 12 Sep 2023 19:26:17 +0300
From:   Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>
To:     tiwai@...e.com, perex@...ex.cz, arnd@...db.de
Cc:     masahiroy@...nel.org, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org, pierre-louis.bossart@...ux.intel.com
Subject: [PATCH] ALSA: hda: intel-sdw-acpi: Use u8 type for link index

Use consistently u8 for sdw link index. The id is limited to 4, u8 is
adequate in size to store it.

This change will also fixes the following compiler warning/error (W=1):

sound/hda/intel-sdw-acpi.c: In function ‘sdw_intel_acpi_scan’:
sound/hda/intel-sdw-acpi.c:34:35: error: ‘-subproperties’ directive output may be truncated writing 14 bytes into a region of size between 7 and 17 [-Werror=format-truncation=]
   34 |                  "mipi-sdw-link-%d-subproperties", i);
      |                                   ^~~~~~~~~~~~~~
In function ‘is_link_enabled’,
    inlined from ‘sdw_intel_scan_controller’ at sound/hda/intel-sdw-acpi.c:106:8,
    inlined from ‘sdw_intel_acpi_scan’ at sound/hda/intel-sdw-acpi.c:180:9:
sound/hda/intel-sdw-acpi.c:33:9: note: ‘snprintf’ output between 30 and 40 bytes into a destination of size 32
   33 |         snprintf(name, sizeof(name),
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   34 |                  "mipi-sdw-link-%d-subproperties", i);
      |                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

The warnings got brought to light by a recent patch upstream:
commit 6d4ab2e97dcf ("extrawarn: enable format and stringop overflow warnings in W=1")

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>
---
 sound/hda/intel-sdw-acpi.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/sound/hda/intel-sdw-acpi.c b/sound/hda/intel-sdw-acpi.c
index 5cb92f7ccbca..b57d72ea4503 100644
--- a/sound/hda/intel-sdw-acpi.c
+++ b/sound/hda/intel-sdw-acpi.c
@@ -23,7 +23,7 @@ static int ctrl_link_mask;
 module_param_named(sdw_link_mask, ctrl_link_mask, int, 0444);
 MODULE_PARM_DESC(sdw_link_mask, "Intel link mask (one bit per link)");
 
-static bool is_link_enabled(struct fwnode_handle *fw_node, int i)
+static bool is_link_enabled(struct fwnode_handle *fw_node, u8 idx)
 {
 	struct fwnode_handle *link;
 	char name[32];
@@ -31,7 +31,7 @@ static bool is_link_enabled(struct fwnode_handle *fw_node, int i)
 
 	/* Find master handle */
 	snprintf(name, sizeof(name),
-		 "mipi-sdw-link-%d-subproperties", i);
+		 "mipi-sdw-link-%hhu-subproperties", idx);
 
 	link = fwnode_get_named_child_node(fw_node, name);
 	if (!link)
@@ -51,8 +51,8 @@ static int
 sdw_intel_scan_controller(struct sdw_intel_acpi_info *info)
 {
 	struct acpi_device *adev = acpi_fetch_acpi_dev(info->handle);
-	int ret, i;
-	u8 count;
+	u8 count, i;
+	int ret;
 
 	if (!adev)
 		return -EINVAL;
-- 
2.42.0