[PATCH] uio_hv_generic: set callbacks on open

Stephen Hemminger stephen at networkplumber.org
Mon Dec 10 18:18:19 UTC 2018


This fixes the problem where uio application was unable to
use multple queues on restart. The root cause is that the callbacks
are cleared on disconnect. Change to setting up callbacks
everytime in open.

Fixes: cdfa835c6e5e ("uio_hv_generic: defer opening vmbus until first use")
Reported-by: Mohammed Gamal <mgamal at redhat.com>
Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>
---
 drivers/uio/uio_hv_generic.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c
index c2493d011225..3c5169eb23f5 100644
--- a/drivers/uio/uio_hv_generic.c
+++ b/drivers/uio/uio_hv_generic.c
@@ -204,9 +204,11 @@ hv_uio_open(struct uio_info *info, struct inode *inode)
 	if (atomic_inc_return(&pdata->refcnt) != 1)
 		return 0;
 
+	vmbus_set_chn_rescind_callback(dev->channel, hv_uio_rescind);
+	vmbus_set_sc_create_callback(dev->channel, hv_uio_new_channel);
+
 	ret = vmbus_connect_ring(dev->channel,
 				 hv_uio_channel_cb, dev->channel);
-
 	if (ret == 0)
 		dev->channel->inbound.ring_buffer->interrupt_mask = 1;
 	else
@@ -334,9 +336,6 @@ hv_uio_probe(struct hv_device *dev,
 		goto fail_close;
 	}
 
-	vmbus_set_chn_rescind_callback(channel, hv_uio_rescind);
-	vmbus_set_sc_create_callback(channel, hv_uio_new_channel);
-
 	ret = sysfs_create_bin_file(&channel->kobj, &ring_buffer_bin_attr);
 	if (ret)
 		dev_notice(&dev->device,
-- 
2.19.2



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