________________________________________ 发件人: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> 发送时间: 2021年3月1日 16:00 收件人: Zhang, Qiang 抄送: zaitcev@xxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx 主题: Re: [PATCH] USB: usblp: Add device status detection in usblp_poll() [Please note: This e-mail is from an EXTERNAL e-mail address] On Mon, Mar 01, 2021 at 12:03:00PM +0800, qiang.zhang@xxxxxxxxxxxxx wrote: > From: Zqiang <qiang.zhang@xxxxxxxxxxxxx> > > If usblp device has been disconnected, direct return > 'EPOLLHUP | EPOLLERR' in usblp_poll(). > >Why? What problem are you solving here? Is this fixing an >older >commit, if so, what one? > There is not need fix older commit. After the device is disconnected, if the userspace call poll/select() function, will block and never be awakened . Thanks Qiang >Please provide a lot more information here, this is not very >descriptive. > >thanks, > >greg k-h
