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powerpc/perf: Return accordingly on invalid chip-id in

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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: 885dcd709b ("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>
This commit is contained in:
Anju T Sudhakar 2018-11-27 13:54:52 +05:30 committed by Michael Ellerman
parent 659a6e38db
commit a913e5e8b4
1 changed files with 5 additions and 0 deletions
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5
arch/powerpc/perf/imc-pmu.c
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@ -487,6 +487,11 @@ static int nest_imc_event_init(struct perf_event *event)
* Get the base memory addresss for this cpu. * Get the base memory addresss for this cpu.
*/ */
chip_id = cpu_to_chip_id(event->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; pcni = pmu->mem_info;
do { do {
if (pcni->id == chip_id) { if (pcni->id == chip_id) {