From 6fd28941447bf2c8ca0f26fda612a1cabc41663f Mon Sep 17 00:00:00 2001 From: Naman Jain Date: Thu, 29 Aug 2024 12:43:12 +0530 Subject: [PATCH] Drivers: hv: vmbus: Fix rescind handling in uio_hv_generic Rescind offer handling relies on rescind callbacks for some of the resources cleanup, if they are registered. It does not unregister vmbus device for the primary channel closure, when callback is registered. Without it, next onoffer does not come, rescind flag remains set and device goes to unusable state. Add logic to unregister vmbus for the primary channel in rescind callback to ensure channel removal and relid release, and to ensure that next onoffer can be received and handled properly. Cc: stable@vger.kernel.org Fixes: ca3cda6fcf1e ("uio_hv_generic: add rescind support") Signed-off-by: Naman Jain Reviewed-by: Saurabh Sengar Link: https://lore.kernel.org/r/20240829071312.1595-3-namjain@linux.microsoft.com Signed-off-by: Greg Kroah-Hartman --- drivers/hv/vmbus_drv.c | 1 + drivers/uio/uio_hv_generic.c | 8 ++++++++ 2 files changed, 9 insertions(+) diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index c857dc3975be..4bae382a3eb4 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -1952,6 +1952,7 @@ void vmbus_device_unregister(struct hv_device *device_obj) */ device_unregister(&device_obj->device); } +EXPORT_SYMBOL_GPL(vmbus_device_unregister); #ifdef CONFIG_ACPI /* diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c index e3e66a3e85a8..870409599411 100644 --- a/drivers/uio/uio_hv_generic.c +++ b/drivers/uio/uio_hv_generic.c @@ -121,6 +121,14 @@ static void hv_uio_rescind(struct vmbus_channel *channel) /* Wake up reader */ uio_event_notify(&pdata->info); + + /* + * With rescind callback registered, rescind path will not unregister the device + * from vmbus when the primary channel is rescinded. + * Without it, rescind handling is incomplete and next onoffer msg does not come. + * Unregister the device from vmbus here. + */ + vmbus_device_unregister(channel->device_obj); } /* Sysfs API to allow mmap of the ring buffers