Drivers: hv: util: Pass the channel information during the init call
authorK. Y. Srinivasan <kys@microsoft.com>
Fri, 26 Feb 2016 23:13:19 +0000 (15:13 -0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 2 Mar 2016 00:57:20 +0000 (16:57 -0800)
commitb9830d120cbe155863399f25eaef6aa8353e767f
tree7aeea7c18f0ba6ac4c3b73658fc1c27db718fd17
parentd452ab7b4c65dfcaee88a0d6866eeeb98a3d1884
Drivers: hv: util: Pass the channel information during the init call

Pass the channel information to the util drivers that need to defer
reading the channel while they are processing a request. This would address
the following issue reported by Vitaly:

Commit 3cace4a61610 ("Drivers: hv: utils: run polling callback always in
interrupt context") removed direct *_transaction.state = HVUTIL_READY
assignments from *_handle_handshake() functions introducing the following
race: if a userspace daemon connects before we get first non-negotiation
request from the server hv_poll_channel() won't set transaction state to
HVUTIL_READY as (!channel) condition will fail, we set it to non-NULL on
the first real request from the server.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reported-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/hv/hv_fcopy.c
drivers/hv/hv_kvp.c
drivers/hv/hv_snapshot.c
drivers/hv/hv_util.c
include/linux/hyperv.h