On Fri, Dec 22, 2017 at 01:38:52PM -0800, Bart Van Assche wrote:
> Avoid that the following two warnings are reported when registering an
> rxe device:
>
> WARNING: CPU: 2 PID: 1005 at drivers/infiniband/core/device.c:449 ib_register_device+0x591/0x640 [ib_core]
> CPU: 2 PID: 1005 Comm: run_tests Not tainted 4.15.0-rc4-dbg+ #2
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014
> RIP: 0010:ib_register_device+0x591/0x640 [ib_core]
> Call Trace:
> rxe_register_device+0x3c6/0x470 [rdma_rxe]
> rxe_add+0x543/0x5e0 [rdma_rxe]
> rxe_net_add+0x37/0xb0 [rdma_rxe]
> rxe_param_set_add+0x5a/0x120 [rdma_rxe]
> param_attr_store+0x5e/0xc0
> module_attr_store+0x19/0x30
> sysfs_kf_write+0x3d/0x50
> kernfs_fop_write+0x116/0x1a0
> __vfs_write+0x23/0x120
> vfs_write+0xbe/0x1b0
> SyS_write+0x44/0xa0
> entry_SYSCALL_64_fastpath+0x23/0x9a
>
> WARNING: CPU: 2 PID: 1005 at drivers/infiniband/core/sysfs.c:1279 ib_device_register_sysfs+0x11d/0x160 [ib_core]
> CPU: 2 PID: 1005 Comm: run_tests Tainted: G W 4.15.0-rc4-dbg+ #2
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014
> RIP: 0010:ib_device_register_sysfs+0x11d/0x160 [ib_core]
> Call Trace:
> ib_register_device+0x3f7/0x640 [ib_core]
> rxe_register_device+0x3c6/0x470 [rdma_rxe]
> rxe_add+0x543/0x5e0 [rdma_rxe]
> rxe_net_add+0x37/0xb0 [rdma_rxe]
> rxe_param_set_add+0x5a/0x120 [rdma_rxe]
> param_attr_store+0x5e/0xc0
> module_attr_store+0x19/0x30
> sysfs_kf_write+0x3d/0x50
> kernfs_fop_write+0x116/0x1a0
> __vfs_write+0x23/0x120
> vfs_write+0xbe/0x1b0
> SyS_write+0x44/0xa0
> entry_SYSCALL_64_fastpath+0x23/0x9a
>
> Fixes: commit 99db9494035f ("IB/core: Remove ib_device.dma_device")
^^^^^^ redundant
> Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxx>
> Cc: Leon Romanovsky <leon@xxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # v4.11
> ---
> drivers/infiniband/core/device.c | 2 +-
> drivers/infiniband/core/sysfs.c | 1 -
> 2 files changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
> index 30914f3baa5f..b9d7570e9989 100644
> --- a/drivers/infiniband/core/device.c
> +++ b/drivers/infiniband/core/device.c
> @@ -446,7 +446,6 @@ int ib_register_device(struct ib_device *device,
> struct ib_udata uhw = {.outlen = 0, .inlen = 0};
> struct device *parent = device->dev.parent;
>
> - WARN_ON_ONCE(!parent);
> WARN_ON_ONCE(device->dma_device);
> if (device->dev.dma_ops) {
I understand that it fixed warning for you, but why is it correct?
You are using "parent" in this "if (device->dev.dma_ops)" too.
> /*
> @@ -465,6 +464,7 @@ int ib_register_device(struct ib_device *device,
> * The caller did not provide custom DMA operations. Use the
> * DMA mapping operations of the parent device.
> */
> + WARN_ON_ONCE(!parent);
> device->dma_device = parent;
> }
>
> diff --git a/drivers/infiniband/core/sysfs.c b/drivers/infiniband/core/sysfs.c
> index e30d86fa1855..8ae1308eecc7 100644
> --- a/drivers/infiniband/core/sysfs.c
> +++ b/drivers/infiniband/core/sysfs.c
> @@ -1276,7 +1276,6 @@ int ib_device_register_sysfs(struct ib_device *device,
> int ret;
> int i;
>
> - WARN_ON_ONCE(!device->dev.parent);
> ret = dev_set_name(class_dev, "%s", device->name);
> if (ret)
> return ret;
> --
> 2.15.1
>
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