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https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
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759f42987f
Race scenario:
thread A thread B
p9_write_work() p9_fd_request()
if (list_empty
(&m->unsent_req_list))
...
spin_lock(&client->lock);
req->status = REQ_STATUS_UNSENT;
list_add_tail(..., &m->unsent_req_list);
spin_unlock(&client->lock);
....
if (n & POLLOUT &&
!test_and_set_bit(Wworksched, &m->wsched)
schedule_work(&m->wq);
--> not done because Wworksched is set
clear_bit(Wworksched, &m->wsched);
return;
--> nobody will take care of sending the new request.
This is not very likely to happen though, because p9_write_work()
being called with an empty unsent_req_list is not frequent.
But this also means that taking the lock earlier will not be costly.
Signed-off-by: Simon Derr <simon.derr@bull.net>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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|---|---|---|
| .. | ||
| client.c | ||
| error.c | ||
| Kconfig | ||
| Makefile | ||
| mod.c | ||
| protocol.c | ||
| protocol.h | ||
| trans_common.c | ||
| trans_common.h | ||
| trans_fd.c | ||
| trans_rdma.c | ||
| trans_virtio.c | ||
| util.c | ||