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path: root/drivers/usb/gadget/legacy/inode.c
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Diffstat (limited to 'drivers/usb/gadget/legacy/inode.c')
-rw-r--r--drivers/usb/gadget/legacy/inode.c82
1 files changed, 44 insertions, 38 deletions
diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
index ce9e31f3d26b..62566a8e7451 100644
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -20,6 +20,7 @@
#include <linux/uaccess.h>
#include <linux/sched.h>
#include <linux/slab.h>
+#include <linux/string_choices.h>
#include <linux/poll.h>
#include <linux/kthread.h>
#include <linux/aio.h>
@@ -31,6 +32,12 @@
#include <linux/usb/gadgetfs.h>
#include <linux/usb/gadget.h>
+#include <linux/usb/composite.h> /* for USB_GADGET_DELAYED_STATUS */
+
+/* Undef helpers from linux/usb/composite.h as gadgetfs redefines them */
+#undef DBG
+#undef ERROR
+#undef INFO
/*
@@ -143,7 +150,6 @@ struct dev_data {
void *buf;
wait_queue_head_t wait;
struct super_block *sb;
- struct dentry *dentry;
/* except this scratch i/o buffer for ep0 */
u8 rbuf[RBUF_SIZE];
@@ -201,7 +207,6 @@ struct ep_data {
struct usb_endpoint_descriptor desc, hs_desc;
struct list_head epfiles;
wait_queue_head_t wait;
- struct dentry *dentry;
};
static inline void get_ep (struct ep_data *data)
@@ -699,7 +704,6 @@ static const struct file_operations ep_io_operations = {
.open = ep_open,
.release = ep_release,
- .llseek = no_llseek,
.unlocked_ioctl = ep_ioctl,
.read_iter = ep_read_iter,
.write_iter = ep_write_iter,
@@ -1177,7 +1181,7 @@ ep0_fasync (int f, struct file *fd, int on)
{
struct dev_data *dev = fd->private_data;
// caller must F_SETOWN before signal delivery happens
- VDEBUG (dev, "%s %s\n", __func__, on ? "on" : "off");
+ VDEBUG(dev, "%s %s\n", __func__, str_on_off(on));
return fasync_helper (f, fd, on, &dev->fasync);
}
@@ -1511,7 +1515,16 @@ delegate:
event->u.setup = *ctrl;
ep0_readable (dev);
spin_unlock (&dev->lock);
- return 0;
+ /*
+ * Return USB_GADGET_DELAYED_STATUS as a workaround to
+ * stop some UDC drivers (e.g. dwc3) from automatically
+ * proceeding with the status stage for 0-length
+ * transfers.
+ * Should be removed once all UDC drivers are fixed to
+ * always delay the status stage until a response is
+ * queued to EP0.
+ */
+ return w_length == 0 ? USB_GADGET_DELAYED_STATUS : 0;
}
}
@@ -1546,18 +1559,12 @@ static void destroy_ep_files (struct dev_data *dev)
spin_lock_irq (&dev->lock);
while (!list_empty(&dev->epfiles)) {
struct ep_data *ep;
- struct inode *parent;
- struct dentry *dentry;
/* break link to FS */
ep = list_first_entry (&dev->epfiles, struct ep_data, epfiles);
list_del_init (&ep->epfiles);
spin_unlock_irq (&dev->lock);
- dentry = ep->dentry;
- ep->dentry = NULL;
- parent = d_inode(dentry->d_parent);
-
/* break link to controller */
mutex_lock(&ep->lock);
if (ep->state == STATE_EP_ENABLED)
@@ -1568,13 +1575,11 @@ static void destroy_ep_files (struct dev_data *dev)
mutex_unlock(&ep->lock);
wake_up (&ep->wait);
- put_ep (ep);
/* break link to dcache */
- inode_lock(parent);
- d_delete (dentry);
- dput (dentry);
- inode_unlock(parent);
+ simple_remove_by_name(dev->sb->s_root, ep->name, NULL);
+
+ put_ep (ep);
spin_lock_irq (&dev->lock);
}
@@ -1582,14 +1587,14 @@ static void destroy_ep_files (struct dev_data *dev)
}
-static struct dentry *
-gadgetfs_create_file (struct super_block *sb, char const *name,
+static int gadgetfs_create_file (struct super_block *sb, char const *name,
void *data, const struct file_operations *fops);
static int activate_ep_files (struct dev_data *dev)
{
struct usb_ep *ep;
struct ep_data *data;
+ int err;
gadget_for_each_ep (ep, dev->gadget) {
@@ -1600,7 +1605,7 @@ static int activate_ep_files (struct dev_data *dev)
mutex_init(&data->lock);
init_waitqueue_head (&data->wait);
- strncpy (data->name, ep->name, sizeof (data->name) - 1);
+ strscpy(data->name, ep->name);
refcount_set (&data->count, 1);
data->dev = dev;
get_dev (dev);
@@ -1612,9 +1617,9 @@ static int activate_ep_files (struct dev_data *dev)
if (!data->req)
goto enomem1;
- data->dentry = gadgetfs_create_file (dev->sb, data->name,
+ err = gadgetfs_create_file (dev->sb, data->name,
data, &ep_io_operations);
- if (!data->dentry)
+ if (err)
goto enomem2;
list_add_tail (&data->epfiles, &dev->epfiles);
}
@@ -1924,7 +1929,6 @@ gadget_dev_open (struct inode *inode, struct file *fd)
}
static const struct file_operations ep0_operations = {
- .llseek = no_llseek,
.open = gadget_dev_open,
.read = ep0_read,
@@ -1969,7 +1973,7 @@ gadgetfs_make_inode (struct super_block *sb,
inode->i_mode = mode;
inode->i_uid = make_kuid(&init_user_ns, default_uid);
inode->i_gid = make_kgid(&init_user_ns, default_gid);
- inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode);
+ simple_inode_init_ts(inode);
inode->i_private = data;
inode->i_fop = fops;
}
@@ -1979,30 +1983,32 @@ gadgetfs_make_inode (struct super_block *sb,
/* creates in fs root directory, so non-renamable and non-linkable.
* so inode and dentry are paired, until device reconfig.
*/
-static struct dentry *
-gadgetfs_create_file (struct super_block *sb, char const *name,
+static int gadgetfs_create_file (struct super_block *sb, char const *name,
void *data, const struct file_operations *fops)
{
struct dentry *dentry;
struct inode *inode;
- dentry = d_alloc_name(sb->s_root, name);
- if (!dentry)
- return NULL;
-
inode = gadgetfs_make_inode (sb, data, fops,
S_IFREG | (default_perm & S_IRWXUGO));
- if (!inode) {
- dput(dentry);
- return NULL;
+ if (!inode)
+ return -ENOMEM;
+
+ dentry = simple_start_creating(sb->s_root, name);
+ if (IS_ERR(dentry)) {
+ iput(inode);
+ return PTR_ERR(dentry);
}
- d_add (dentry, inode);
- return dentry;
+
+ d_make_persistent(dentry, inode);
+
+ simple_done_creating(dentry);
+ return 0;
}
static const struct super_operations gadget_fs_operations = {
.statfs = simple_statfs,
- .drop_inode = generic_delete_inode,
+ .drop_inode = inode_just_drop,
};
static int
@@ -2050,8 +2056,8 @@ gadgetfs_fill_super (struct super_block *sb, struct fs_context *fc)
goto Enomem;
dev->sb = sb;
- dev->dentry = gadgetfs_create_file(sb, CHIP, dev, &ep0_operations);
- if (!dev->dentry) {
+ rc = gadgetfs_create_file(sb, CHIP, dev, &ep0_operations);
+ if (rc) {
put_dev(dev);
goto Enomem;
}
@@ -2093,7 +2099,7 @@ static void
gadgetfs_kill_sb (struct super_block *sb)
{
mutex_lock(&sb_mutex);
- kill_litter_super (sb);
+ kill_anon_super (sb);
if (the_device) {
put_dev (the_device);
the_device = NULL;
generated by cgit (git 2.34.1) at 2025-12-24 23:49:30 +0000