diff options
| author | Andrea Parri (Microsoft) <parri.andrea@gmail.com> | 2020-04-06 02:15:08 +0200 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2020-04-23 13:17:11 +0000 |
| commit | 238d2ed8f7d1b1ca0c13334bb8197a42654af946 (patch) | |
| tree | a158a1982bd4b0e85cae1d26110706bbeb457dc4 /drivers/hv/hyperv_vmbus.h | |
| parent | ac5047671758ad4be9f93898247b3a8b6dfde4c7 (diff) | |
hv_utils: Always execute the fcopy and vss callbacks in a tasklet
The fcopy and vss callback functions could be running in a tasklet
at the same time they are called in hv_poll_channel(). Current code
serializes the invocations of these functions, and their accesses to
the channel ring buffer, by sending an IPI to the CPU that is allowed
to access the ring buffer, cf. hv_poll_channel(). This IPI mechanism
becomes infeasible if we allow changing the CPU that a channel will
interrupt. Instead modify the callback wrappers to always execute
the fcopy and vss callbacks in a tasklet, thus mirroring the solution
for the kvp callback functions adopted since commit a3ade8cc474d8
("HV: properly delay KVP packets when negotiation is in progress").
This will ensure that the callback function can't run on two CPUs at
the same time.
Suggested-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Link: https://lore.kernel.org/r/20200406001514.19876-6-parri.andrea@gmail.com
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'drivers/hv/hyperv_vmbus.h')
| -rw-r--r-- | drivers/hv/hyperv_vmbus.h | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h index 3edf993b0fd9..5e5cebe5d048 100644 --- a/drivers/hv/hyperv_vmbus.h +++ b/drivers/hv/hyperv_vmbus.h @@ -378,12 +378,7 @@ static inline void hv_poll_channel(struct vmbus_channel *channel, { if (!channel) return; - - if (in_interrupt() && (channel->target_cpu == smp_processor_id())) { - cb(channel); - return; - } - smp_call_function_single(channel->target_cpu, cb, channel, true); + cb(channel); } enum hvutil_device_state { |