From: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Date: Fri, 16 Oct 2020 18:43:39 +0000 (-0400)
Subject: Fix: common: poll: compat_poll_wait never finishes
X-Git-Tag: v2.11.6~7
X-Git-Url: https://git.lttng.org/?a=commitdiff_plain;h=13c4d8aba5eca5f0d70a42661731d2de6bdc02a4;hp=13c4d8aba5eca5f0d70a42661731d2de6bdc02a4;p=lttng-tools.git

Fix: common: poll: compat_poll_wait never finishes

compat_poll_wait hangs when poll returns an array of file
descriptors of the form:
  [ Inactive Active ]

The logic to find the first idle pollfd entry is bogus and actually
skips the first idle entry. This causes the follow-up loop to never
conclude.

The pollfd array defragmentation logic is re-written in a simpler
style to handle those cases appropriately.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I8669a870df1ec1160f05e35e83671917bb80d6f9
---