From a9c859033f6ec772f8e3228c343bb1321584ae0e Mon Sep 17 00:00:00 2001 From: Shen Jing Date: Thu, 1 Nov 2018 15:35:17 +0530 Subject: 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: Shen Jing Signed-off-by: Saranya Gopal Signed-off-by: Felipe Balbi --- drivers/usb/gadget/function/f_fs.c | 26 ++++++++------------------ 1 file changed, 8 insertions(+), 18 deletions(-) (limited to 'drivers/usb/gadget') diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c index 3ada83d81bda..31e8bf3578c8 100644 --- a/drivers/usb/gadget/function/f_fs.c +++ b/drivers/usb/gadget/function/f_fs.c @@ -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; } -- cgit v1.2.3