Merge tag 'driver-core-6.19-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core

Pull driver core fixes from Danilo Krummrich:

 - Introduce DMA Rust helpers to avoid build errors when !CONFIG_HAS_DMA

 - Remove unnecessary (and hence incorrect) endian conversion in the
   Rust PCI driver sample code

 - Fix memory leak in the unwind path of debugfs_change_name()

 - Support non-const struct software_node pointers in
   SOFTWARE_NODE_REFERENCE(), after introducing _Generic()

 - Avoid NULL pointer dereference in the unwind path of
   simple_xattrs_free()

* tag 'driver-core-6.19-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core:
  fs/kernfs: null-ptr deref in simple_xattrs_free()
  software node: Also support referencing non-constant software nodes
  debugfs: Fix memleak in debugfs_change_name().
  samples: rust: fix endianness issue in rust_driver_pci
  rust: dma: add helpers for architectures without CONFIG_HAS_DMA

Author: torvalds

fs/debugfs/inode.c

@@ -841,8 +841,10 @@ int __printf(2, 3) debugfs_change_name(struct dentry *dentry, const char *fmt, .
 	rd.new_parent = rd.old_parent;
 	rd.flags = RENAME_NOREPLACE;
 	target = lookup_noperm_unlocked(&QSTR(new_name), rd.new_parent);
-	if (IS_ERR(target))
-		return PTR_ERR(target);
+	if (IS_ERR(target)) {
+		error = PTR_ERR(target);
+		goto out_free;
+	}
 
 	error = start_renaming_two_dentries(&rd, dentry, target);
 	if (error) {
@@ -862,6 +864,7 @@ int __printf(2, 3) debugfs_change_name(struct dentry *dentry, const char *fmt, .
 out:
 	dput(rd.old_parent);
 	dput(target);
+out_free:
 	kfree_const(new_name);
 	return error;
 }

fs/kernfs/dir.c

@@ -681,8 +681,10 @@ static struct kernfs_node *__kernfs_new_node(struct kernfs_root *root,
 	return kn;
 
  err_out4:
-	simple_xattrs_free(&kn->iattr->xattrs, NULL);
-	kmem_cache_free(kernfs_iattrs_cache, kn->iattr);
+	if (kn->iattr) {
+		simple_xattrs_free(&kn->iattr->xattrs, NULL);
+		kmem_cache_free(kernfs_iattrs_cache, kn->iattr);
+	}
  err_out3:
 	spin_lock(&root->kernfs_idr_lock);
 	idr_remove(&root->ino_idr, (u32)kernfs_ino(kn));

include/linux/property.h

@@ -371,6 +371,7 @@ struct software_node_ref_args {
 (const struct software_node_ref_args) {				\
 	.swnode = _Generic(_ref_,				\
 			   const struct software_node *: _ref_,	\
+			   struct software_node *: _ref_,	\
 			   default: NULL),			\
 	.fwnode = _Generic(_ref_,				\
 			   struct fwnode_handle *: _ref_,	\

rust/helpers/dma.c

@@ -19,3 +19,24 @@ int rust_helper_dma_set_mask_and_coherent(struct device *dev, u64 mask)
 {
 	return dma_set_mask_and_coherent(dev, mask);
 }
+
+int rust_helper_dma_set_mask(struct device *dev, u64 mask)
+{
+	return dma_set_mask(dev, mask);
+}
+
+int rust_helper_dma_set_coherent_mask(struct device *dev, u64 mask)
+{
+	return dma_set_coherent_mask(dev, mask);
+}
+
+int rust_helper_dma_map_sgtable(struct device *dev, struct sg_table *sgt,
+				enum dma_data_direction dir, unsigned long attrs)
+{
+	return dma_map_sgtable(dev, sgt, dir, attrs);
+}
+
+size_t rust_helper_dma_max_mapping_size(struct device *dev)
+{
+	return dma_max_mapping_size(dev);
+}

samples/rust/rust_driver_pci.rs

@@ -48,7 +48,7 @@ impl SampleDriver {
         // Select the test.
         bar.write8(index.0, Regs::TEST);
 
-        let offset = u32::from_le(bar.read32(Regs::OFFSET)) as usize;
+        let offset = bar.read32(Regs::OFFSET) as usize;
         let data = bar.read8(Regs::DATA);
 
         // Write `data` to `offset` to increase `count` by one.