git: 42f4c37035ee - stable/15 - acpi/apm: Don't claim silent success for APMIO_BIOS ioctls

The branch stable/15 has been updated by jhb:

URL: https://cgit.FreeBSD.org/src/commit/?id=42f4c37035ee97bfdcc19efac2d53501377bef54

commit 42f4c37035ee97bfdcc19efac2d53501377bef54
Author:     John Baldwin <jhb@FreeBSD.org>
AuthorDate: 2026-09-30 16:21:16 +0000
Commit:     John Baldwin <jhb@FreeBSD.org>
CommitDate: 2026-10-08 20:42:33 +0000

    acpi/apm: Don't claim silent success for APMIO_BIOS ioctls
    
    Report failure as if the request had failed.  This causes apm(8) to
    correctly report the resume timer as "unknown" rather than random
    garbage.
    
    Reviewed by:    imp
    Differential Revision:  https://reviews.freebsd.org/D59939
    
    (cherry picked from commit 1d7f0c742863ad65e9d27df8f5ae4afddd6cc5e2)
---
 sys/x86/acpica/acpi_apm.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/sys/x86/acpica/acpi_apm.c b/sys/x86/acpica/acpi_apm.c
index e781085a442f..318f83d8d922 100644
--- a/sys/x86/acpica/acpi_apm.c
+++ b/sys/x86/acpica/acpi_apm.c
@@ -368,8 +368,7 @@ apmioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td
 	case APMIO_BIOS:
 		if ((flag & FWRITE) == 0)
 			return (EPERM);
-		bzero(addr, sizeof(struct apm_bios_arg));
-		break;
+		return (EOPNOTSUPP);
 	default:
 		error = EINVAL;
 		break;