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-rw-r--r--net/wireless/debugfs.c160
1 files changed, 160 insertions, 0 deletions
diff --git a/net/wireless/debugfs.c b/net/wireless/debugfs.c
index 0878b162890a..40e49074e2ee 100644
--- a/net/wireless/debugfs.c
+++ b/net/wireless/debugfs.c
@@ -4,6 +4,7 @@
*
* Copyright 2009 Luis R. Rodriguez <lrodriguez@atheros.com>
* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
+ * Copyright (C) 2023 Intel Corporation
*/
#include <linux/slab.h>
@@ -109,3 +110,162 @@ void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev)
DEBUGFS_ADD(long_retry_limit);
DEBUGFS_ADD(ht40allow_map);
}
+
+struct debugfs_read_work {
+ struct wiphy_work work;
+ ssize_t (*handler)(struct wiphy *wiphy,
+ struct file *file,
+ char *buf,
+ size_t count,
+ void *data);
+ struct wiphy *wiphy;
+ struct file *file;
+ char *buf;
+ size_t bufsize;
+ void *data;
+ ssize_t ret;
+ struct completion completion;
+};
+
+static void wiphy_locked_debugfs_read_work(struct wiphy *wiphy,
+ struct wiphy_work *work)
+{
+ struct debugfs_read_work *w = container_of(work, typeof(*w), work);
+
+ w->ret = w->handler(w->wiphy, w->file, w->buf, w->bufsize, w->data);
+ complete(&w->completion);
+}
+
+static void wiphy_locked_debugfs_read_cancel(struct dentry *dentry,
+ void *data)
+{
+ struct debugfs_read_work *w = data;
+
+ wiphy_work_cancel(w->wiphy, &w->work);
+ complete(&w->completion);
+}
+
+ssize_t wiphy_locked_debugfs_read(struct wiphy *wiphy, struct file *file,
+ char *buf, size_t bufsize,
+ char __user *userbuf, size_t count,
+ loff_t *ppos,
+ ssize_t (*handler)(struct wiphy *wiphy,
+ struct file *file,
+ char *buf,
+ size_t bufsize,
+ void *data),
+ void *data)
+{
+ struct debugfs_read_work work = {
+ .handler = handler,
+ .wiphy = wiphy,
+ .file = file,
+ .buf = buf,
+ .bufsize = bufsize,
+ .data = data,
+ .ret = -ENODEV,
+ .completion = COMPLETION_INITIALIZER_ONSTACK(work.completion),
+ };
+ struct debugfs_cancellation cancellation = {
+ .cancel = wiphy_locked_debugfs_read_cancel,
+ .cancel_data = &work,
+ };
+
+ /* don't leak stack data or whatever */
+ memset(buf, 0, bufsize);
+
+ wiphy_work_init(&work.work, wiphy_locked_debugfs_read_work);
+ wiphy_work_queue(wiphy, &work.work);
+
+ debugfs_enter_cancellation(file, &cancellation);
+ wait_for_completion(&work.completion);
+ debugfs_leave_cancellation(file, &cancellation);
+
+ if (work.ret < 0)
+ return work.ret;
+
+ if (WARN_ON(work.ret > bufsize))
+ return -EINVAL;
+
+ return simple_read_from_buffer(userbuf, count, ppos, buf, work.ret);
+}
+EXPORT_SYMBOL_GPL(wiphy_locked_debugfs_read);
+
+struct debugfs_write_work {
+ struct wiphy_work work;
+ ssize_t (*handler)(struct wiphy *wiphy,
+ struct file *file,
+ char *buf,
+ size_t count,
+ void *data);
+ struct wiphy *wiphy;
+ struct file *file;
+ char *buf;
+ size_t count;
+ void *data;
+ ssize_t ret;
+ struct completion completion;
+};
+
+static void wiphy_locked_debugfs_write_work(struct wiphy *wiphy,
+ struct wiphy_work *work)
+{
+ struct debugfs_write_work *w = container_of(work, typeof(*w), work);
+
+ w->ret = w->handler(w->wiphy, w->file, w->buf, w->count, w->data);
+ complete(&w->completion);
+}
+
+static void wiphy_locked_debugfs_write_cancel(struct dentry *dentry,
+ void *data)
+{
+ struct debugfs_write_work *w = data;
+
+ wiphy_work_cancel(w->wiphy, &w->work);
+ complete(&w->completion);
+}
+
+ssize_t wiphy_locked_debugfs_write(struct wiphy *wiphy,
+ struct file *file, char *buf, size_t bufsize,
+ const char __user *userbuf, size_t count,
+ ssize_t (*handler)(struct wiphy *wiphy,
+ struct file *file,
+ char *buf,
+ size_t count,
+ void *data),
+ void *data)
+{
+ struct debugfs_write_work work = {
+ .handler = handler,
+ .wiphy = wiphy,
+ .file = file,
+ .buf = buf,
+ .count = count,
+ .data = data,
+ .ret = -ENODEV,
+ .completion = COMPLETION_INITIALIZER_ONSTACK(work.completion),
+ };
+ struct debugfs_cancellation cancellation = {
+ .cancel = wiphy_locked_debugfs_write_cancel,
+ .cancel_data = &work,
+ };
+
+ /* mostly used for strings so enforce NUL-termination for safety */
+ if (count >= bufsize)
+ return -EINVAL;
+
+ memset(buf, 0, bufsize);
+
+ if (copy_from_user(buf, userbuf, count))
+ return -EFAULT;
+
+ wiphy_work_init(&work.work, wiphy_locked_debugfs_write_work);
+ wiphy_work_queue(wiphy, &work.work);
+
+ debugfs_enter_cancellation(file, &cancellation);
+ wait_for_completion(&work.completion);
+ debugfs_leave_cancellation(file, &cancellation);
+
+ return work.ret;
+}
+EXPORT_SYMBOL_GPL(wiphy_locked_debugfs_write);