On Tue, Aug 08, 2017 at 06:56:37PM +0300, Anton Vasilyev wrote:
> Debugfs file reset_stats is created with S_IRUSR permissions,
> but ocrdma_dbgfs_ops_read() doesn't support OCRDMA_RESET_STATS,
> whereas ocrdma_dbgfs_ops_write() supports only OCRDMA_RESET_STATS.
>
> The patch fixes misstype with permissions.
>
> Found by Linux Driver Verification project (linuxtesting.org).
>
> Signed-off-by: Anton Vasilyev <vasilyev@xxxxxxxxx>
> ---
> drivers/infiniband/hw/ocrdma/ocrdma_stats.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_stats.c b/drivers/infiniband/hw/ocrdma/ocrdma_stats.c
> index 66056f9..d42c617 100644
> --- a/drivers/infiniband/hw/ocrdma/ocrdma_stats.c
> +++ b/drivers/infiniband/hw/ocrdma/ocrdma_stats.c
> @@ -834,7 +834,7 @@ void ocrdma_add_port_stats(struct ocrdma_dev *dev)
>
> dev->reset_stats.type = OCRDMA_RESET_STATS;
> dev->reset_stats.dev = dev;
> - if (!debugfs_create_file("reset_stats", S_IRUSR, dev->dir,
> + if (!debugfs_create_file("reset_stats", S_IWUSR, dev->dir,
> &dev->reset_stats, &ocrdma_dbg_ops))
> goto err;
>
If I didn't miss anything, the reset_stats knob wouldn't work.
Any read of statistics from that debugfs will trigger the call to
ocrdma_update_stats and it will call to ocrdma_mbx_rdma_stats(dev, false).
For write operations to that "reset_stats", there is call
to ocrdma_mbx_rdma_stats with second argument (reset) as true.
But it doesn't do much with that "reset" argument, except update of reset_stats.
git grep reset_stats drivers/infiniband/hw/ocrdma/* drivers/net/ethernet/emulex/
drivers/infiniband/hw/ocrdma/ocrdma.h: struct ocrdma_stats reset_stats;
drivers/infiniband/hw/ocrdma/ocrdma_hw.c: req->reset_stats = reset;
drivers/infiniband/hw/ocrdma/ocrdma_sli.h: u8 reset_stats;
drivers/infiniband/hw/ocrdma/ocrdma_stats.c: dev->reset_stats.type = OCRDMA_RESET_STATS;
drivers/infiniband/hw/ocrdma/ocrdma_stats.c: dev->reset_stats.dev = dev;
drivers/infiniband/hw/ocrdma/ocrdma_stats.c: if (!debugfs_create_file("reset_stats", S_IRUSR, dev->dir,
drivers/infiniband/hw/ocrdma/ocrdma_stats.c: &dev->reset_stats, &ocrdma_dbg_ops))
drivers/net/ethernet/emulex/benet/be_cmds.c: req->cmd_params.params.reset_stats = 0;
drivers/net/ethernet/emulex/benet/be_cmds.h: u8 reset_stats;
Thanks
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