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authorK. Y. Srinivasan <kys@microsoft.com>2016-02-26 15:13:19 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-03-01 16:57:20 -0800
commitb9830d120cbe155863399f25eaef6aa8353e767f (patch)
tree7aeea7c18f0ba6ac4c3b73658fc1c27db718fd17 /drivers/hv/hv_util.c
parentd452ab7b4c65dfcaee88a0d6866eeeb98a3d1884 (diff)
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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>
Diffstat (limited to 'drivers/hv/hv_util.c')
-rw-r--r--drivers/hv/hv_util.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c
index 7994ec2e4151..d5acaa2d8e61 100644
--- a/drivers/hv/hv_util.c
+++ b/drivers/hv/hv_util.c
@@ -322,6 +322,7 @@ static int util_probe(struct hv_device *dev,
srv->recv_buffer = kmalloc(PAGE_SIZE * 4, GFP_KERNEL);
if (!srv->recv_buffer)
return -ENOMEM;
+ srv->channel = dev->channel;
if (srv->util_init) {
ret = srv->util_init(srv);
if (ret) {