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| author | Anju T Sudhakar <anju@linux.vnet.ibm.com> | 2018-11-27 11:24:52 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-05-02 19:54:59 +0300 |
| commit | a913e5e8b43be1d3897a141ce61c1ec071cad89c (patch) | |
| tree | 7f1b3ef5e5324df128785e2216ebedf7b4666ee1 /arch/powerpc/perf | |
| parent | 659a6e38db0b422c63fd68ca7e78a8daadca061e (diff) | |
| download | linux-a913e5e8b43be1d3897a141ce61c1ec071cad89c.tar.xz | |
powerpc/perf: Return accordingly on invalid chip-id in
Nest hardware counter memory resides in a per-chip reserve-memory.
During nest_imc_event_init(), chip-id of the event-cpu is considered to
calculate the base memory addresss for that cpu. Return, proper error
condition if the chip_id calculated is invalid.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 885dcd709ba91 ("powerpc/perf: Add nest IMC PMU support")
Reviewed-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Anju T Sudhakar <anju@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/perf')
| -rw-r--r-- | arch/powerpc/perf/imc-pmu.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c index b1c37cc3fa98..6159e9edddfd 100644 --- a/arch/powerpc/perf/imc-pmu.c +++ b/arch/powerpc/perf/imc-pmu.c @@ -487,6 +487,11 @@ static int nest_imc_event_init(struct perf_event *event) * Get the base memory addresss for this cpu. */ chip_id = cpu_to_chip_id(event->cpu); + + /* Return, if chip_id is not valid */ + if (chip_id < 0) + return -ENODEV; + pcni = pmu->mem_info; do { if (pcni->id == chip_id) { |