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| author | Pawel Moll <pawel.moll@arm.com> | 2014-07-31 16:16:37 +0100 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2014-07-31 20:46:57 -0700 |
| commit | 3e528cb7bae00ba0d73def6645d0f2fa906ee3e8 (patch) | |
| tree | f6b31134fdf241f9b1f371faf84a951aed00bc8a /drivers/bus | |
| parent | f64a3c895bce1c703e706b8ee0badb39918c7dee (diff) | |
| download | linux-3e528cb7bae00ba0d73def6645d0f2fa906ee3e8.tar.gz linux-3e528cb7bae00ba0d73def6645d0f2fa906ee3e8.tar.bz2 linux-3e528cb7bae00ba0d73def6645d0f2fa906ee3e8.zip | |
bus: arm-ccn: Fix error handling at event allocation
The bitfield allocation function returns error condition
as a negative value, but in two cases its result
was assigned to an unsigned member of the hw_perf_event
structure, thus the error would not be ever detected.
Fixed by using an intermediate, signed variable.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'drivers/bus')
| -rw-r--r-- | drivers/bus/arm-ccn.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/bus/arm-ccn.c b/drivers/bus/arm-ccn.c index 4f86bbb2fac5..3266f8ff9311 100644 --- a/drivers/bus/arm-ccn.c +++ b/drivers/bus/arm-ccn.c @@ -591,7 +591,7 @@ static int arm_ccn_pmu_event_init(struct perf_event *event) struct arm_ccn *ccn; struct hw_perf_event *hw = &event->hw; u32 node_xp, type, event_id; - int valid; + int valid, bit; struct arm_ccn_component *source; int i; @@ -713,17 +713,18 @@ static int arm_ccn_pmu_event_init(struct perf_event *event) /* Allocate an event source or a watchpoint */ if (type == CCN_TYPE_XP && event_id == CCN_EVENT_WATCHPOINT) - hw->config_base = arm_ccn_pmu_alloc_bit(source->xp.dt_cmp_mask, + bit = arm_ccn_pmu_alloc_bit(source->xp.dt_cmp_mask, CCN_NUM_XP_WATCHPOINTS); else - hw->config_base = arm_ccn_pmu_alloc_bit(source->pmu_events_mask, + bit = arm_ccn_pmu_alloc_bit(source->pmu_events_mask, CCN_NUM_PMU_EVENTS); - if (hw->config_base < 0) { + if (bit < 0) { dev_warn(ccn->dev, "No more event sources/watchpoints on node/XP %d!\n", node_xp); clear_bit(hw->idx, ccn->dt.pmu_counters_mask); return -EAGAIN; } + hw->config_base = bit; ccn->dt.pmu_counters[hw->idx].event = event; |