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Subject[PATCH 0/3] Fix problems about handling bio to plug when bio merged failed.
There are some problems about handling bio which merge to plug failed.
Patch1 will avoid unnecessary plug should_sort test,although it's not a bug.
Patch2 correct a bug when handle more devices,it leak some devices to trace plug-operation.

Because the patch2,so it's not necessary to sort when flush plug.Although patch2 has
O(n*n) complexity,it's more than list_sort which has O(nlog(n)) complexity.But the plug
list is unlikely too long,so i think patch3 can accept.

Jianpeng Ma (3):
block: avoid unnecessary plug should_sort test.
block: Fix not tracing all device plug-operation.
block: Remove unnecessary requests sort.

block/blk-core.c | 35 ++++++++++++++++++-----------------
1 file changed, 18 insertions(+), 17 deletions(-)

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