Vitaly Kuznetsov 8a8c38c8e6 Drivers: hv: vmbus: Fix a race condition when unregistering a device ... commit 04a258c162 upstream. When build with Debug the following crash is sometimes observed: Call Trace: [<ffffffff812b9600>] string+0x40/0x100 [<ffffffff812bb038>] vsnprintf+0x218/0x5e0 [<ffffffff810baf7d>] ? trace_hardirqs_off+0xd/0x10 [<ffffffff812bb4c1>] vscnprintf+0x11/0x30 [<ffffffff8107a2f0>] vprintk+0xd0/0x5c0 [<ffffffffa0051ea0>] ? vmbus_process_rescind_offer+0x0/0x110 [hv_vmbus] [<ffffffff8155c71c>] printk+0x41/0x45 [<ffffffffa004ebac>] vmbus_device_unregister+0x2c/0x40 [hv_vmbus] [<ffffffffa0051ecb>] vmbus_process_rescind_offer+0x2b/0x110 [hv_vmbus] ... This happens due to the following race: between 'if (channel->device_obj)' check in vmbus_process_rescind_offer() and pr_debug() in vmbus_device_unregister() the device can disappear. Fix the issue by taking an additional reference to the device before proceeding to vmbus_device_unregister(). Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2015-01-16 06:59:32 -08:00
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Kconfig	…
Makefile	…
channel.c	Drivers: hv: vmbus: Fix a bug in vmbus_open()	2014-10-30 09:38:21 -07:00
channel_mgmt.c	Drivers: hv: vmbus: Fix a race condition when unregistering a device	2015-01-16 06:59:32 -08:00
connection.c	Drivers: hv: vmbus: Cleanup vmbus_post_msg()	2014-10-30 09:38:21 -07:00
hv.c	drivers: hv: Mark the function hv_synic_free_cpu() as static in hv.c	2013-12-18 16:41:52 -08:00
hv_balloon.c	Drivers: hv: balloon: Ensure pressure reports are posted regularly	2014-06-26 15:15:41 -04:00
hv_kvp.c	Drivers: hv: util: Fix a bug in the KVP code	2014-07-28 08:05:56 -07:00
hv_snapshot.c	…
hv_util.c	Drivers: hv: util: Fix a bug in the KVP code	2014-07-28 08:05:56 -07:00
hyperv_vmbus.h	…
ring_buffer.c	…
vmbus_drv.c	ACPI: Clean up inclusions of ACPI header files	2013-12-07 01:03:14 +01:00