Dexuan Cui <de...@microsoft.com> writes: >> -----Original Message----- >> From: devel [mailto:driverdev-devel-boun...@linuxdriverproject.org] On Behalf >> Of K. Y. Srinivasan >> Sent: Tuesday, December 15, 2015 11:02 >> To: gre...@linuxfoundation.org; linux-kernel@vger.kernel.org; >> de...@linuxdriverproject.org; o...@aepfle.de; a...@canonical.com; >> vkuzn...@redhat.com; jasow...@redhat.com >> Subject: [PATCH 3/9] Drivers: hv: utils: introduce HVUTIL_TRANSPORT_DESTROY >> mode >> >> From: Vitaly Kuznetsov <vkuzn...@redhat.com> >> >> When Hyper-V host asks us to remove some util driver by closing the >> appropriate channel there is no easy way to force the current file >> descriptor holder to hang up but we can start to respond -EBADF to all >> operations asking it to exit gracefully. >> >> As we're setting hvt->mode from two separate contexts now we need to use >> a proper locking. >> >> ... >> @@ -99,6 +107,10 @@ static unsigned int hvt_op_poll(struct file *file, >> poll_table *wait) >> hvt = container_of(file->f_op, struct hvutil_transport, fops); >> >> poll_wait(file, &hvt->outmsg_q, wait); >> + >> + if (hvt->mode == HVUTIL_TRANSPORT_DESTROY) >> + return -EBADF; >> + >> if (hvt->outmsg_len > 0) >> return POLLIN | POLLRDNORM; > > Hi Vitaly, > Should hvt_op_poll() return -EBADF -- I think it probably > should return POLLERR or POLLHUP?
Oh, sorry, my bad -- hvt_op_poll() returns unsigned int and -EBADF is definitely inappropriate. I see this patch was already merged to char-misc-testing so I'll send a follow-up patch to fix things up. Thanks! -- Vitaly -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
