Commit a9c85903 authored by Shen Jing's avatar Shen Jing Committed by Felipe Balbi

Revert "usb: gadget: ffs: Fix BUG when userland exits with submitted AIO transfers"

This reverts commit b4194da3f9087dd38d91b40f9bec42d59ce589a8
since it causes list corruption followed by kernel panic:

Workqueue: adb ffs_aio_cancel_worker
RIP: 0010:__list_add_valid+0x4d/0x70
Call Trace:
insert_work+0x47/0xb0
__queue_work+0xf6/0x400
queue_work_on+0x65/0x70
dwc3_gadget_giveback+0x44/0x50 [dwc3]
dwc3_gadget_ep_dequeue+0x83/0x2d0 [dwc3]
? finish_wait+0x80/0x80
usb_ep_dequeue+0x1e/0x90
process_one_work+0x18c/0x3b0
worker_thread+0x3c/0x390
? process_one_work+0x3b0/0x3b0
kthread+0x11e/0x140
? kthread_create_worker_on_cpu+0x70/0x70
ret_from_fork+0x3a/0x50

This issue is seen with warm reboot stability testing.
Signed-off-by: default avatarShen Jing <jingx.shen@intel.com>
Signed-off-by: default avatarSaranya Gopal <saranya.gopal@intel.com>
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent 3c135e89
......@@ -215,7 +215,6 @@ struct ffs_io_data {
struct mm_struct *mm;
struct work_struct work;
struct work_struct cancellation_work;
struct usb_ep *ep;
struct usb_request *req;
......@@ -1073,31 +1072,22 @@ ffs_epfile_open(struct inode *inode, struct file *file)
return 0;
}
static void ffs_aio_cancel_worker(struct work_struct *work)
{
struct ffs_io_data *io_data = container_of(work, struct ffs_io_data,
cancellation_work);
ENTER();
usb_ep_dequeue(io_data->ep, io_data->req);
}
static int ffs_aio_cancel(struct kiocb *kiocb)
{
struct ffs_io_data *io_data = kiocb->private;
struct ffs_data *ffs = io_data->ffs;
struct ffs_epfile *epfile = kiocb->ki_filp->private_data;
int value;
ENTER();
if (likely(io_data && io_data->ep && io_data->req)) {
INIT_WORK(&io_data->cancellation_work, ffs_aio_cancel_worker);
queue_work(ffs->io_completion_wq, &io_data->cancellation_work);
value = -EINPROGRESS;
} else {
spin_lock_irq(&epfile->ffs->eps_lock);
if (likely(io_data && io_data->ep && io_data->req))
value = usb_ep_dequeue(io_data->ep, io_data->req);
else
value = -EINVAL;
}
spin_unlock_irq(&epfile->ffs->eps_lock);
return value;
}
......
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