git: 949ebebce4bb - stable/15 - hwpmc: return errors from PMC_OP_PMCGETMSR

The branch stable/15 has been updated by mhorne:

URL: https://cgit.FreeBSD.org/src/commit/?id=949ebebce4bb22b5253aee93ed48391c4fdd91b4

commit 949ebebce4bb22b5253aee93ed48391c4fdd91b4
Author:     Osvaldo Janeri Filho <ojanerif@amd.com>
AuthorDate: 2026-10-08 09:44:00 +0000
Commit:     Mitchell Horne <mhorne@FreeBSD.org>
CommitDate: 2026-10-30 14:05:05 +0000

    hwpmc: return errors from PMC_OP_PMCGETMSR
    
    pcd_get_msr() returns a positive errno, but only a negative value was
    treated as a failure, so errors were reported as success.
    
    Signed-off-by:  Osvaldo Janeri Filho <ojanerif@amd.com>
    Reviewed by:    mhorne
    MFC after:      3 days
    Sponsored by:   AMD
    Pull Request:   https://github.com/freebsd/freebsd-src/pull/2461
    
    (cherry picked from commit 911fcebfc7f1e5a5dd184137c0b9d62b4b066f17)
---
 sys/dev/hwpmc/hwpmc_mod.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/dev/hwpmc/hwpmc_mod.c b/sys/dev/hwpmc/hwpmc_mod.c
index de6beb165c66..c5771f8a0fe7 100644
--- a/sys/dev/hwpmc/hwpmc_mod.c
+++ b/sys/dev/hwpmc/hwpmc_mod.c
@@ -4375,7 +4375,7 @@ pmc_syscall_handler(struct thread *td, void *syscall_args)
 			break;
 		}
 
-		if ((error = (*pcd->pcd_get_msr)(adjri, &gm.pm_msr)) < 0)
+		if ((error = (*pcd->pcd_get_msr)(adjri, &gm.pm_msr)) != 0)
 			break;
 
 		if ((error = copyout(&gm, arg, sizeof(gm))) < 0)