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Stephen Hemminger 6712cc9c22 vmbus: don't return values for uninitalized channels 
For unsupported device types, the vmbus channel ringbuffer is never
initialized, and therefore reading the sysfs files will return garbage
or cause a kernel OOPS.

Fixes: c2e5df616e ("vmbus: add per-channel sysfs info")

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Cc: <stable@vger.kernel.org> # 4.15
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2018-09-12 09:31:00 +02:00
..
Kconfig hv: add SPDX license id to Kconfig 2018-03-28 13:24:56 +02:00
Makefile
…
channel.c Drivers: hv: vmbus: Remove use of slow_virt_to_phys() 2018-08-02 10:20:59 +02:00
channel_mgmt.c Drivers: hv: vmbus: Reset the channel callback in vmbus_onoffer_rescind() 2018-08-02 10:20:59 +02:00
connection.c Drivers: hv: vmbus: Removed an unnecessary cast from void * 2018-05-15 09:40:37 +02:00
hv.c Drivers: hv: vmbus: Cleanup synic memory free path 2018-08-02 10:20:59 +02:00
hv_balloon.c use the new async probing feature for the hyperv drivers 2018-07-03 13:02:28 +02:00
hv_fcopy.c
…
hv_kvp.c
…
hv_snapshot.c
…
hv_trace.c hv: add SPDX license to trace 2018-03-28 13:24:56 +02:00
hv_trace.h hv: add SPDX license to trace 2018-03-28 13:24:56 +02:00
hv_trace_balloon.h
…
hv_util.c use the new async probing feature for the hyperv drivers 2018-07-03 13:02:28 +02:00
hv_utils_transport.c
…
hv_utils_transport.h
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hyperv_vmbus.h Drivers: hv: vmbus: enable VMBus protocol version 5.0 2018-05-14 16:06:48 +02:00
ring_buffer.c Drivers: hv: vmbus: Add comments on ring buffer signaling 2018-07-03 13:02:28 +02:00
vmbus_drv.c vmbus: don't return values for uninitalized channels 2018-09-12 09:31:00 +02:00