[tip: x86/misc] x86/amd_node: Update __amd_smn_rw() error paths

[tip-bot2 for Yazen Ghannam]

The following commit has been merged into the x86/misc branch of tip:

Commit-ID:     35df797665cb69e68a3a99e499e75e73efbd4f77
Gitweb:        https://git.kernel.org/tip/35df797665cb69e68a3a99e499e75e73efbd4f77
Author:        Yazen Ghannam <yazen.ghannam@xxxxxxx>
AuthorDate:    Fri, 06 Dec 2024 16:12:04 
Committer:     Borislav Petkov (AMD) <bp@xxxxxxxxx>
CommitterDate: Wed, 08 Jan 2025 11:01:46 +01:00

x86/amd_node: Update __amd_smn_rw() error paths

Use guard(mutex) and convert PCI error codes to common ones.

Suggested-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
Signed-off-by: Yazen Ghannam <yazen.ghannam@xxxxxxx>
Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Link: https://lore.kernel.org/r/20241206161210.163701-12-yazen.ghannam@xxxxxxx
---
 arch/x86/kernel/amd_node.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/amd_node.c b/arch/x86/kernel/amd_node.c
index 95e5ca0..0cca541 100644
--- a/arch/x86/kernel/amd_node.c
+++ b/arch/x86/kernel/amd_node.c
@@ -136,28 +136,24 @@ static int __amd_smn_rw(u16 node, u32 address, u32 *value, bool write)
 	int err = -ENODEV;
 
 	if (node >= amd_nb_num())
-		goto out;
+		return err;
 
 	root = node_to_amd_nb(node)->root;
 	if (!root)
-		goto out;
+		return err;
 
-	mutex_lock(&smn_mutex);
+	guard(mutex)(&smn_mutex);
 
 	err = pci_write_config_dword(root, 0x60, address);
 	if (err) {
 		pr_warn("Error programming SMN address 0x%x.\n", address);
-		goto out_unlock;
+		return pcibios_err_to_errno(err);
 	}
 
 	err = (write ? pci_write_config_dword(root, 0x64, *value)
 		     : pci_read_config_dword(root, 0x64, value));
 
-out_unlock:
-	mutex_unlock(&smn_mutex);
-
-out:
-	return err;
+	return pcibios_err_to_errno(err);
 }
 
 int __must_check amd_smn_read(u16 node, u32 address, u32 *value)