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Message-ID: <YlVTNXXtXtm0syLm@t480s.localdomain>
Date: Tue, 12 Apr 2022 12:23:49 +0200
From: Slawomir Stepien <sst@...zta.fm>
To: Frank Rowand <frowand.list@...il.com>
Cc: Rob Herring <robh+dt@...nel.org>, pantelis.antoniou@...sulko.com,
Slawomir Stepien <slawomir.stepien@...ia.com>,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Geert Uytterhoeven <geert+renesas@...der.be>,
Alan Tull <atull@...nel.org>,
Jan Kiszka <jan.kiszka@...mens.com>
Subject: Re: [PATCH v2 1/2] of: overlay: rename variables to be consistent
On kwi 10, 2022 23:10, Frank Rowand wrote:
> adding cc: Jan Kiszka <jan.kiszka@...mens.com>
>
> On 4/10/22 16:08, frowand.list@...il.com wrote:
> > From: Frank Rowand <frank.rowand@...y.com>
> >
> > Variables change name across function calls when there is not a good
> > reason to do so. Fix by changing "fdt" to "new_fdt" and "tree" to
> > "overlay_tree".
> >
> > The name disparity was confusing when creating the following commit.
> > The name changes are in this separate commit to make review of the
> > following commmit less complex.
> >
> > Signed-off-by: Frank Rowand <frank.rowand@...y.com>
Hi Frank
It looks good to me.
Reviewed-by: Slawomir Stepien <slawomir.stepien@...ia.com>
> > ---
> > Changes since v1:
> > - This patch is added to the series.
> >
> > drivers/of/overlay.c | 94 ++++++++++++++++++++++----------------------
> > 1 file changed, 47 insertions(+), 47 deletions(-)
> >
> > diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
> > index d80160cf34bb..f74aa9ff67aa 100644
> > --- a/drivers/of/overlay.c
> > +++ b/drivers/of/overlay.c
> > @@ -57,7 +57,7 @@ struct fragment {
> > * struct overlay_changeset
> > * @id: changeset identifier
> > * @ovcs_list: list on which we are located
> > - * @fdt: base of memory allocated to hold aligned FDT that was unflattened to create @overlay_tree
> > + * @new_fdt: Memory allocated to hold unflattened aligned FDT
> > * @overlay_tree: expanded device tree that contains the fragment nodes
> > * @count: count of fragment structures
> > * @fragments: fragment nodes in the overlay expanded device tree
> > @@ -67,7 +67,7 @@ struct fragment {
> > struct overlay_changeset {
> > int id;
> > struct list_head ovcs_list;
> > - const void *fdt;
> > + const void *new_fdt;
> > struct device_node *overlay_tree;
> > int count;
> > struct fragment *fragments;
> > @@ -718,19 +718,20 @@ static struct device_node *find_target(struct device_node *info_node)
> >
> > /**
> > * init_overlay_changeset() - initialize overlay changeset from overlay tree
> > - * @ovcs: Overlay changeset to build
> > - * @fdt: base of memory allocated to hold aligned FDT that was unflattened to create @tree
> > - * @tree: Contains the overlay fragments and overlay fixup nodes
> > + * @ovcs: Overlay changeset to build
> > + * @new_fdt: Memory allocated to hold unflattened aligned FDT
> > + * @overlay_tree: Contains the overlay fragments and overlay fixup nodes
> > *
> > * Initialize @ovcs. Populate @ovcs->fragments with node information from
> > - * the top level of @tree. The relevant top level nodes are the fragment
> > - * nodes and the __symbols__ node. Any other top level node will be ignored.
> > + * the top level of @overlay_tree. The relevant top level nodes are the
> > + * fragment nodes and the __symbols__ node. Any other top level node will
> > + * be ignored.
> > *
> > * Return: 0 on success, -ENOMEM if memory allocation failure, -EINVAL if error
> > - * detected in @tree, or -ENOSPC if idr_alloc() error.
> > + * detected in @overlay_tree, or -ENOSPC if idr_alloc() error.
> > */
> > static int init_overlay_changeset(struct overlay_changeset *ovcs,
> > - const void *fdt, struct device_node *tree)
> > + const void *new_fdt, struct device_node *overlay_tree)
> > {
> > struct device_node *node, *overlay_node;
> > struct fragment *fragment;
> > @@ -741,17 +742,17 @@ static int init_overlay_changeset(struct overlay_changeset *ovcs,
> > * Warn for some issues. Can not return -EINVAL for these until
> > * of_unittest_apply_overlay() is fixed to pass these checks.
> > */
> > - if (!of_node_check_flag(tree, OF_DYNAMIC))
> > - pr_debug("%s() tree is not dynamic\n", __func__);
> > + if (!of_node_check_flag(overlay_tree, OF_DYNAMIC))
> > + pr_debug("%s() overlay_tree is not dynamic\n", __func__);
> >
> > - if (!of_node_check_flag(tree, OF_DETACHED))
> > - pr_debug("%s() tree is not detached\n", __func__);
> > + if (!of_node_check_flag(overlay_tree, OF_DETACHED))
> > + pr_debug("%s() overlay_tree is not detached\n", __func__);
> >
> > - if (!of_node_is_root(tree))
> > - pr_debug("%s() tree is not root\n", __func__);
> > + if (!of_node_is_root(overlay_tree))
> > + pr_debug("%s() overlay_tree is not root\n", __func__);
> >
> > - ovcs->overlay_tree = tree;
> > - ovcs->fdt = fdt;
> > + ovcs->overlay_tree = overlay_tree;
> > + ovcs->new_fdt = new_fdt;
> >
> > INIT_LIST_HEAD(&ovcs->ovcs_list);
> >
> > @@ -764,7 +765,7 @@ static int init_overlay_changeset(struct overlay_changeset *ovcs,
> > cnt = 0;
> >
> > /* fragment nodes */
> > - for_each_child_of_node(tree, node) {
> > + for_each_child_of_node(overlay_tree, node) {
> > overlay_node = of_get_child_by_name(node, "__overlay__");
> > if (overlay_node) {
> > cnt++;
> > @@ -772,7 +773,7 @@ static int init_overlay_changeset(struct overlay_changeset *ovcs,
> > }
> > }
> >
> > - node = of_get_child_by_name(tree, "__symbols__");
> > + node = of_get_child_by_name(overlay_tree, "__symbols__");
> > if (node) {
> > cnt++;
> > of_node_put(node);
> > @@ -785,7 +786,7 @@ static int init_overlay_changeset(struct overlay_changeset *ovcs,
> > }
> >
> > cnt = 0;
> > - for_each_child_of_node(tree, node) {
> > + for_each_child_of_node(overlay_tree, node) {
> > overlay_node = of_get_child_by_name(node, "__overlay__");
> > if (!overlay_node)
> > continue;
> > @@ -807,7 +808,7 @@ static int init_overlay_changeset(struct overlay_changeset *ovcs,
> > * if there is a symbols fragment in ovcs->fragments[i] it is
> > * the final element in the array
> > */
> > - node = of_get_child_by_name(tree, "__symbols__");
> > + node = of_get_child_by_name(overlay_tree, "__symbols__");
> > if (node) {
> > ovcs->symbols_fragment = 1;
> > fragment = &fragments[cnt];
> > @@ -862,11 +863,11 @@ static void free_overlay_changeset(struct overlay_changeset *ovcs)
> > kfree(ovcs->fragments);
> > /*
> > * There should be no live pointers into ovcs->overlay_tree and
> > - * ovcs->fdt due to the policy that overlay notifiers are not allowed
> > - * to retain pointers into the overlay devicetree.
> > + * ovcs->new_fdt due to the policy that overlay notifiers are not
> > + * allowed to retain pointers into the overlay devicetree.
> > */
> > kfree(ovcs->overlay_tree);
> > - kfree(ovcs->fdt);
> > + kfree(ovcs->new_fdt);
> > kfree(ovcs);
> > }
> >
> > @@ -874,16 +875,15 @@ static void free_overlay_changeset(struct overlay_changeset *ovcs)
> > * internal documentation
> > *
> > * of_overlay_apply() - Create and apply an overlay changeset
> > - * @fdt: base of memory allocated to hold the aligned FDT
> > - * @tree: Expanded overlay device tree
> > - * @ovcs_id: Pointer to overlay changeset id
> > + * @new_fdt: Memory allocated to hold the aligned FDT
> > + * @overlay_tree: Expanded overlay device tree
> > + * @ovcs_id: Pointer to overlay changeset id
> > *
> > * Creates and applies an overlay changeset.
> > *
> > * If an error occurs in a pre-apply notifier, then no changes are made
> > * to the device tree.
> > *
> > -
> > * A non-zero return value will not have created the changeset if error is from:
> > * - parameter checks
> > * - building the changeset
> > @@ -913,29 +913,29 @@ static void free_overlay_changeset(struct overlay_changeset *ovcs)
> > * id is returned to *ovcs_id.
> > */
> >
> > -static int of_overlay_apply(const void *fdt, struct device_node *tree,
> > - int *ovcs_id)
> > +static int of_overlay_apply(const void *new_fdt,
> > + struct device_node *overlay_tree, int *ovcs_id)
> > {
> > struct overlay_changeset *ovcs;
> > int ret = 0, ret_revert, ret_tmp;
> >
> > /*
> > - * As of this point, fdt and tree belong to the overlay changeset.
> > - * overlay changeset code is responsible for freeing them.
> > + * As of this point, new_fdt and overlay_tree belong to the overlay
> > + * changeset. overlay changeset code is responsible for freeing them.
> > */
> >
> > if (devicetree_corrupt()) {
> > pr_err("devicetree state suspect, refuse to apply overlay\n");
> > - kfree(fdt);
> > - kfree(tree);
> > + kfree(new_fdt);
> > + kfree(overlay_tree);
> > ret = -EBUSY;
> > goto out;
> > }
> >
> > ovcs = kzalloc(sizeof(*ovcs), GFP_KERNEL);
> > if (!ovcs) {
> > - kfree(fdt);
> > - kfree(tree);
> > + kfree(new_fdt);
> > + kfree(overlay_tree);
> > ret = -ENOMEM;
> > goto out;
> > }
> > @@ -943,20 +943,20 @@ static int of_overlay_apply(const void *fdt, struct device_node *tree,
> > of_overlay_mutex_lock();
> > mutex_lock(&of_mutex);
> >
> > - ret = of_resolve_phandles(tree);
> > + ret = of_resolve_phandles(overlay_tree);
> > if (ret)
> > - goto err_free_tree;
> > + goto err_free_overlay_tree;
> >
> > - ret = init_overlay_changeset(ovcs, fdt, tree);
> > + ret = init_overlay_changeset(ovcs, new_fdt, overlay_tree);
> > if (ret)
> > - goto err_free_tree;
> > + goto err_free_overlay_tree;
> >
> > /*
> > * after overlay_notify(), ovcs->overlay_tree related pointers may have
> > - * leaked to drivers, so can not kfree() tree, aka ovcs->overlay_tree;
> > - * and can not free memory containing aligned fdt. The aligned fdt
> > - * is contained within the memory at ovcs->fdt, possibly at an offset
> > - * from ovcs->fdt.
> > + * leaked to drivers, so can not kfree() overlay_tree,
> > + * aka ovcs->overlay_tree; and can not free memory containing aligned
> > + * fdt. The aligned fdt is contained within the memory at
> > + * ovcs->new_fdt, possibly at an offset from ovcs->new_fdt.
> > */
> > ret = overlay_notify(ovcs, OF_OVERLAY_PRE_APPLY);
> > if (ret) {
> > @@ -997,9 +997,9 @@ static int of_overlay_apply(const void *fdt, struct device_node *tree,
> >
> > goto out_unlock;
> >
> > -err_free_tree:
> > - kfree(fdt);
> > - kfree(tree);
> > +err_free_overlay_tree:
> > + kfree(new_fdt);
> > + kfree(overlay_tree);
> >
> > err_free_overlay_changeset:
> > free_overlay_changeset(ovcs);
>
--
Slawomir Stepien
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