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tsm-mr: Fix init breakage after bin_attrs constification by scoping non-const pointers to init phase

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Commit 9bec944506 ("sysfs: constify attribute_group::bin_attrs") enforced
the ro-after-init principle by making elements of bin_attrs_new pointing to
const.

To align with this change, introduce a temporary variable `bap` within the
initialization loop. This improves code clarity by explicitly marking the
initialization scope and eliminates the need for type casts when assigning
to bin_attrs_new.

Signed-off-by: Cedric Xing <cedric.xing@intel.com>
Link: https://patch.msgid.link/20250513164154.10109-1-cedric.xing@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Cedric Xing 2025-05-13 11:41:54 -05:00 • committed by Dan Williams
parent 1f450730ff
commit b0ca403a9e
1 changed files with 15 additions and 15 deletions
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30
drivers/virt/coco/tsm-mr.c
View file

@ -173,7 +173,7 @@ tsm_mr_create_attribute_group(const struct tsm_measurements *tm)
* so that we don't have to free MR names one-by-one in
* tsm_mr_free_attribute_group()
*/
const struct bin_attribute * const *attrs __free(kfree) =
const struct bin_attribute **attrs __free(kfree) =
kzalloc(sizeof(*attrs) * (tm->nr_mrs + 1) + nlen, GFP_KERNEL);
struct tm_context *ctx __free(kfree) =
kzalloc(struct_size(ctx, mrs, tm->nr_mrs), GFP_KERNEL);
@ -187,16 +187,14 @@ tsm_mr_create_attribute_group(const struct tsm_measurements *tm)
end = name + nlen;
for (size_t i = 0; i < tm->nr_mrs; ++i) {
/* break const for init */
struct bin_attribute **bas = (struct bin_attribute **)attrs;
struct bin_attribute *bap = &ctx->mrs[i];
bas[i] = &ctx->mrs[i];
sysfs_bin_attr_init(bas[i]);
sysfs_bin_attr_init(bap);
if (tm->mrs[i].mr_flags & TSM_MR_F_NOHASH)
bas[i]->attr.name = tm->mrs[i].mr_name;
bap->attr.name = tm->mrs[i].mr_name;
else if (name < end) {
bas[i]->attr.name = name;
bap->attr.name = name;
name += snprintf(name, end - name, "%s:%s",
tm->mrs[i].mr_name,
hash_algo_name[tm->mrs[i].mr_hash]);
@ -206,21 +204,23 @@ tsm_mr_create_attribute_group(const struct tsm_measurements *tm)
/* check for duplicated MR definitions */
for (size_t j = 0; j < i; ++j)
if (!strcmp(bas[i]->attr.name, bas[j]->attr.name))
if (!strcmp(bap->attr.name, attrs[j]->attr.name))
return ERR_PTR(-EINVAL);
if (tm->mrs[i].mr_flags & TSM_MR_F_READABLE) {
bas[i]->attr.mode |= 0444;
bas[i]->read_new = tm_digest_read;
bap->attr.mode |= 0444;
bap->read_new = tm_digest_read;
}
if (tm->mrs[i].mr_flags & TSM_MR_F_WRITABLE) {
bas[i]->attr.mode |= 0200;
bas[i]->write_new = tm_digest_write;
bap->attr.mode |= 0200;
bap->write_new = tm_digest_write;
}
bas[i]->size = tm->mrs[i].mr_size;
bas[i]->private = ctx;
bap->size = tm->mrs[i].mr_size;
bap->private = ctx;
attrs[i] = bap;
}
if (name != end)
@ -244,7 +244,7 @@ EXPORT_SYMBOL_GPL(tsm_mr_create_attribute_group);
void tsm_mr_free_attribute_group(const struct attribute_group *attr_grp)
{
if (!IS_ERR_OR_NULL(attr_grp)) {
kfree(attr_grp->bin_attrs);
kfree(attr_grp->bin_attrs_new);
kfree(container_of(attr_grp, struct tm_context, agrp));
}
}