From ca3cda6fcf1e922213a0cc58e708ffb999151db3 Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Tue, 9 Jan 2018 12:57:32 -0800 Subject: uio_hv_generic: add rescind support When host rescinds the device, the UIO driver will clear the interrupt state and notify application. The read (or write) on the interrupt FD will then fail with -EIO. This is simpler than adding lots extra uevent stuff inside UIO. Signed-off-by: Stephen Hemminger Signed-off-by: Greg Kroah-Hartman --- drivers/uio/uio_hv_generic.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'drivers/uio/uio_hv_generic.c') diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c index ee6d862ef4bd..8c6b04a26c47 100644 --- a/drivers/uio/uio_hv_generic.c +++ b/drivers/uio/uio_hv_generic.c @@ -103,6 +103,23 @@ static void hv_uio_channel_cb(void *context) uio_event_notify(&pdata->info); } +/* + * Callback from vmbus_event when channel is rescinded. + */ +static void hv_uio_rescind(struct vmbus_channel *channel) +{ + struct hv_device *hv_dev = channel->primary_channel->device_obj; + struct hv_uio_private_data *pdata = hv_get_drvdata(hv_dev); + + /* + * Turn off the interrupt file handle + * Next read for event will return -EIO + */ + pdata->info.irq = 0; + + /* Wake up reader */ + uio_event_notify(&pdata->info); +} static void hv_uio_cleanup(struct hv_device *dev, struct hv_uio_private_data *pdata) @@ -218,6 +235,8 @@ hv_uio_probe(struct hv_device *dev, goto fail_close; } + vmbus_set_chn_rescind_callback(dev->channel, hv_uio_rescind); + hv_set_drvdata(dev, pdata); return 0; -- cgit