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uio_hv_generic: set callbacks on open 

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: cdfa835c6e ("uio_hv_generic: defer opening vmbus until first use")
Reported-by: Mohammed Gamal <mgamal@redhat.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephen Hemminger 2018-12-10 10:18:19 -08:00 committed by Greg Kroah-Hartman
parent 40e020c129
commit 5e3c420dcc
1 changed files with 3 additions and 4 deletions
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7
drivers/uio/uio_hv_generic.c
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@ -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,