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xfs: free xfs_busy_extents structure when no RT extents are queued

kmemleak occasionally reports leaking xfs_busy_extents structure
from xfs_scrub calls after running xfs/528 (but attributed to following
tests), which seems to be caused by not freeing the xfs_busy_extents
structure when tr.queued is 0 and xfs_trim_rtgroup_extents breaks out
of the main loop. Free the structure in this case.

Fixes: a3315d11305f ("xfs: use rtgroup busy extent list for FITRIM")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

authored by

Christoph Hellwig and committed by
Carlos Maiolino d8a823c6 21ab5179

+3 -1
+3 -1
fs/xfs/xfs_discard.c
··· 726 726 break; 727 727 } 728 728 729 - if (!tr.queued) 729 + if (!tr.queued) { 730 + kfree(tr.extents); 730 731 break; 732 + } 731 733 732 734 /* 733 735 * We hand the extent list to the discard function here so the