git: 9c410fc7ce11 - stable/13 - linuxkpi: drop single-use variable

[Konstantin Belousov]

The branch stable/13 has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=9c410fc7ce116dfabf3ebd246bbfb416699a2a40

commit 9c410fc7ce116dfabf3ebd246bbfb416699a2a40
Author:     Konstantin Belousov <kib at FreeBSD.org>
AuthorDate: 2021-03-30 08:46:42 +0000
Commit:     Konstantin Belousov <kib at FreeBSD.org>
CommitDate: 2021-04-23 11:14:06 +0000

    linuxkpi: drop single-use variable
    
    (cherry picked from commit 8011fb795baa59ba14371d6db5ab661a5db77615)
---
 sys/compat/linuxkpi/common/src/linux_compat.c      |  4 +--
 sys/compat/linuxkpi/common/src/linux_compat.c.orig | 31 ++++++++++++++--------
 2 files changed, 21 insertions(+), 14 deletions(-)

diff --git a/sys/compat/linuxkpi/common/src/linux_compat.c b/sys/compat/linuxkpi/common/src/linux_compat.c
index f8b939a5ec16..8fe4f4509571 100644
--- a/sys/compat/linuxkpi/common/src/linux_compat.c
+++ b/sys/compat/linuxkpi/common/src/linux_compat.c
@@ -2224,16 +2224,14 @@ linux_cdev_static_release(struct kobject *kobj)
 {
 	struct cdev *cdev;
 	struct linux_cdev *ldev;
-	struct kobject *parent;
 
 	ldev = container_of(kobj, struct linux_cdev, kobj);
-	parent = kobj->parent;
 	cdev = ldev->cdev;
 	if (cdev != NULL) {
 		destroy_dev(cdev);
 		ldev->cdev = NULL;
 	}
-	kobject_put(parent);
+	kobject_put(kobj->parent);
 }
 
 void
diff --git a/sys/compat/linuxkpi/common/src/linux_compat.c.orig b/sys/compat/linuxkpi/common/src/linux_compat.c.orig
index 71ea7e0844dc..28413c59bb76 100644
--- a/sys/compat/linuxkpi/common/src/linux_compat.c.orig
+++ b/sys/compat/linuxkpi/common/src/linux_compat.c.orig
@@ -717,15 +717,19 @@ linux_get_fop(struct linux_file *filp, const struct file_operations **fop,
 	ldev = filp->f_cdev;
 	*fop = filp->f_op;
 	if (ldev != NULL) {
-		for (siref = ldev->siref;;) {
-			if ((siref & LDEV_SI_DTR) != 0) {
-				ldev = &dummy_ldev;
-				siref = ldev->siref;
-				*fop = ldev->ops;
-				MPASS((ldev->siref & LDEV_SI_DTR) == 0);
-			} else if (atomic_fcmpset_int(&ldev->siref, &siref,
-			    siref + LDEV_SI_REF)) {
-				break;
+		if (ldev->kobj.ktype == &linux_cdev_static_ktype) {
+			refcount_acquire(&ldev->refs);
+		} else {
+			for (siref = ldev->siref;;) {
+				if ((siref & LDEV_SI_DTR) != 0) {
+					ldev = &dummy_ldev;
+					*fop = ldev->ops;
+					siref = ldev->siref;
+					MPASS((ldev->siref & LDEV_SI_DTR) == 0);
+				} else if (atomic_fcmpset_int(&ldev->siref,
+				    &siref, siref + LDEV_SI_REF)) {
+					break;
+				}
 			}
 		}
 	}
@@ -738,8 +742,13 @@ linux_drop_fop(struct linux_cdev *ldev)
 
 	if (ldev == NULL)
 		return;
-	MPASS((ldev->siref & ~LDEV_SI_DTR) != 0);
-	atomic_subtract_int(&ldev->siref, LDEV_SI_REF);
+	if (ldev->kobj.ktype == &linux_cdev_static_ktype) {
+		linux_cdev_deref(ldev);
+	} else {
+		MPASS(ldev->kobj.ktype == &linux_cdev_ktype);
+		MPASS((ldev->siref & ~LDEV_SI_DTR) != 0);
+		atomic_subtract_int(&ldev->siref, LDEV_SI_REF);
+	}
 }
 
 #define	OPW(fp,td,code) ({			\