On Thu, May 27, 2021 at 2:18 AM Lukas Wunner <lukas@xxxxxxxxx> wrote: > > On Wed, May 26, 2021 at 02:12:38PM +0800, Lambert Wang wrote: > > The user is our new PCI driver under development for WWAN devices . > > Surprise removal could happen under multiple circumstances. > > e.g. Exception, Link Failure, etc. > > > > We wanted this API to detect surprise removal or check device recovery > > when AER and Hotplug are disabled. > > You may want to take a look at pci_dev_is_disconnected(). > > Be aware of its limitations, which Bjorn has already pointed out > and which are discussed in more detail under the following link > in the "Surprise removal" section: > > https://lwn.net/Articles/767885/ > Thanks for the suggestion and the article. Currently I prefer pci_device_is_present() for my scenario. e.g. pci_dev_is_disconnected() seems to use a cached value. If the driver wants to check the device's absence after it *senses* something abnormal, pci_device_is_present() is more suitable. > Thanks, > > Lukas
