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| author | K. Y. Srinivasan <kys@microsoft.com> | 2016-02-26 15:13:19 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-03-01 16:57:20 -0800 |
| commit | b9830d120cbe155863399f25eaef6aa8353e767f (patch) | |
| tree | 7aeea7c18f0ba6ac4c3b73658fc1c27db718fd17 /drivers/hv/hv_util.c | |
| parent | d452ab7b4c65dfcaee88a0d6866eeeb98a3d1884 (diff) | |
| download | linux-b9830d120cbe155863399f25eaef6aa8353e767f.tar.gz linux-b9830d120cbe155863399f25eaef6aa8353e767f.tar.bz2 linux-b9830d120cbe155863399f25eaef6aa8353e767f.zip | |
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.c | 1 |
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) { |