x86/amd_node: Fix PCI device reference counting in amd_smn_init()grafted

The local "root" pointer is a temporary variable used during the device
search. Therefore, refcount related to the search iterators should be cleaned
up after the search is complete.

Use the __free() cleanup macro to ensure the refcount is decremented when the
temporary pointer goes out of scope.

Additionally, increment the refcount when caching a root pointer. This ensures
the in-use refcount is separate from the temporary search refcounting.

Finally, drop the redundant "root = NULL" before the second search loop. The
pci_get_class() iterator always decrements the refcount of its "from"
argument, so the first loop can only fall through with "root" already NULL.

Fixes: 0a4b61d9c2e4 ("x86/amd_node: Fix AMD root device caching")
Closes: https://sashiko.dev/#/patchset/20260806160159.230453-1-jason.andryuk%40amd.com
Reported-by: Sashiko <sashiko-bot@kernel.org>
Assisted-by: LLM
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
Cc: <stable@kernel.org>
Link: https://patch.msgid.link/20260903154325.74343-1-yazen.ghannam@amd.com

1 files changed, 56 insertions, 0 deletions

diff --git a/include/sound/wm2200.h b/include/sound/wm2200.h
new file mode 100644
index 000000000..2e4913ee2
--- /dev/null
+++ b/include/sound/wm2200.h
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * linux/sound/wm2200.h -- Platform data for WM2200
+ *
+ * Copyright 2012 Wolfson Microelectronics. PLC.
+ */
+
+#ifndef __LINUX_SND_WM2200_H
+#define __LINUX_SND_WM2200_H
+
+#define WM2200_GPIO_SET 0x10000
+#define WM2200_MAX_MICBIAS 2
+
+enum wm2200_in_mode {
+	WM2200_IN_SE = 0,
+	WM2200_IN_DIFF = 1,
+	WM2200_IN_DMIC = 2,
+};
+
+enum wm2200_dmic_sup {
+	WM2200_DMIC_SUP_MICVDD = 0,
+	WM2200_DMIC_SUP_MICBIAS1 = 1,
+	WM2200_DMIC_SUP_MICBIAS2 = 2,
+};
+
+enum wm2200_mbias_lvl {
+	WM2200_MBIAS_LVL_1V5 = 1,
+	WM2200_MBIAS_LVL_1V8 = 2,
+	WM2200_MBIAS_LVL_1V9 = 3,
+	WM2200_MBIAS_LVL_2V0 = 4,
+	WM2200_MBIAS_LVL_2V2 = 5,
+	WM2200_MBIAS_LVL_2V4 = 6,
+	WM2200_MBIAS_LVL_2V5 = 7,
+	WM2200_MBIAS_LVL_2V6 = 8,
+};
+
+struct wm2200_micbias {
+	enum wm2200_mbias_lvl mb_lvl;      /** Regulated voltage */
+	unsigned int discharge:1;          /** Actively discharge */
+	unsigned int fast_start:1;         /** Enable aggressive startup ramp rate */
+	unsigned int bypass:1;             /** Use bypass mode */
+};
+
+struct wm2200_pdata {
+	int irq_flags;
+
+	int gpio_defaults[4];
+
+	enum wm2200_in_mode in_mode[3];
+	enum wm2200_dmic_sup dmic_sup[3];
+
+	/** MICBIAS configurations */
+	struct wm2200_micbias micbias[WM2200_MAX_MICBIAS];
+};
+
+#endif