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gfs2: Check for empty queue in run_queue

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[ Upstream commit d838605fea6eabae3746a276fd448f6719eb3926 ]

In run_queue(), check if the queue of pending requests is empty instead
of blindly assuming that it won't be.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andreas Gruenbacher
2025-02-06 14:58:39 +01:00
committed by Greg Kroah-Hartman
parent 2e37d331c0
commit 769d1bccd1
1 changed files with 8 additions and 3 deletions
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11
fs/gfs2/glock.c
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@@ -853,11 +853,12 @@ static void run_queue(struct gfs2_glock *gl, const int nonblock)
__releases(&gl->gl_lockref.lock)
__acquires(&gl->gl_lockref.lock)
{
struct gfs2_holder *gh = NULL;
struct gfs2_holder *gh;
if (test_and_set_bit(GLF_LOCK, &gl->gl_flags))
return;
/* While a demote is in progress, the GLF_LOCK flag must be set. */
GLOCK_BUG_ON(gl, test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags));
if (test_bit(GLF_DEMOTE, &gl->gl_flags) &&
@@ -869,18 +870,22 @@ __acquires(&gl->gl_lockref.lock)
set_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags);
GLOCK_BUG_ON(gl, gl->gl_demote_state == LM_ST_EXCLUSIVE);
gl->gl_target = gl->gl_demote_state;
do_xmote(gl, NULL, gl->gl_target);
return;
} else {
if (test_bit(GLF_DEMOTE, &gl->gl_flags))
gfs2_demote_wake(gl);
if (do_promote(gl))
goto out_unlock;
gh = find_first_waiter(gl);
if (!gh)
goto out_unlock;
gl->gl_target = gh->gh_state;
if (!(gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)))
do_error(gl, 0); /* Fail queued try locks */
do_xmote(gl, gh, gl->gl_target);
return;
}
do_xmote(gl, gh, gl->gl_target);
return;
out_sched:
clear_bit(GLF_LOCK, &gl->gl_flags);