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| author |   Parav Pandit <parav@mellanox.com> | 2019-07-23 09:57:32 +0300 |
|---|---|---|
| committer |   Jason Gunthorpe <jgg@mellanox.com> | 2019-07-25 11:39:38 -0300 |
| commit | a379d1ce32f1c97b19d68cffbd195e025dbb9d43 (patch) | |
| tree | d5183cb08d3f6b278e8bbf840921444f71873d75 | |
| parent | IB/mlx5: Prevent concurrent MR updates during invalidation (diff) | |
| download | linux-dev-a379d1ce32f1c97b19d68cffbd195e025dbb9d43.tar.xz linux-dev-a379d1ce32f1c97b19d68cffbd195e025dbb9d43.zip | |
IB/core: Fix querying total rdma stats
rdma_counter_init() may fail for a device. In such case while calculating
total sum, ignore NULL hstats.
This fixes below observed call trace.
BUG: kernel NULL pointer dereference, address: 00000000000000a0
PGD 8000001009b30067 P4D 8000001009b30067 PUD 10549c9067 PMD 0
Oops: 0000 [#1] SMP PTI
CPU: 55 PID: 20887 Comm: cat Kdump: loaded Not tainted 5.2.0-rc6-jdc+ #13
RIP: 0010:rdma_counter_get_hwstat_value+0xf2/0x150 [ib_core]
Call Trace:
show_hw_stats+0x5e/0x130 [ib_core]
dev_attr_show+0x15/0x50
sysfs_kf_seq_show+0xc6/0x1a0
seq_read+0x132/0x370
vfs_read+0x89/0x140
ksys_read+0x5c/0xd0
do_syscall_64+0x5a/0x240
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Fixes: f34a55e497e8 ("RDMA/core: Get sum value of all counters when perform a sysfs stat read")
Link: https://lore.kernel.org/r/20190723065733.4899-10-leon@kernel.org
Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Mark Zhang <markz@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
| -rw-r--r-- | drivers/infiniband/core/counters.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/infiniband/core/counters.c b/drivers/infiniband/core/counters.c index 01faef7bc061..c7d445635476 100644 --- a/drivers/infiniband/core/counters.c +++ b/drivers/infiniband/core/counters.c @@ -393,6 +393,9 @@ u64 rdma_counter_get_hwstat_value(struct ib_device *dev, u8 port, u32 index) u64 sum; port_counter = &dev->port_data[port].port_counter; + if (!port_counter->hstats) + return 0; + sum = get_running_counters_hwstat_sum(dev, port, index); sum += port_counter->hstats->value[index]; |