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Subject[4.0-rc+] WARNING: CPU: 0 PID: 1 at ./drivers/dma/dmaengine.c:863 dma_async_device_register+0xe0/0x540()
First boot of 4.0-rc+ gave me [1] on a Beaglebone Black due to

commit ecc19d17868be9c9f8f00ed928791533c420f3e0
Author: Maxime Ripard <maxime.ripard@free-electrons.com>
Date: Mon Nov 17 14:42:53 2014 +0100

dmaengine: Add a warning for drivers not using the generic slave caps retrieval

For the slave caps retrieval to be really useful, most drivers need to
implement it.

Hence, we need to be slightly more aggressive, and trigger a warning at
registration time for drivers that don't fill their caps infos in order to
encourage them to implement it.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

Regards,
Peter Hurley

[1]

[ 1.848374] WARNING: CPU: 0 PID: 1 at /home/peter/src/kernels/mainline/drivers/dma/dmaengine.c:863 dma_async_device_register+0xe0/0x540()
[ 1.860798] this driver doesn't support generic slave capabilities reporting
[ 1.867893] Modules linked in:
[ 1.870993] CPU: 0 PID: 1 Comm: swapper Not tainted 4.0.0-rc2+ #115
[ 1.877302] Hardware name: Generic AM33XX (Flattened Device Tree)
[ 1.883478] [<c00164b8>] (unwind_backtrace) from [<c00135e8>] (show_stack+0x20/0x24)
[ 1.891307] [<c00135e8>] (show_stack) from [<c091f7a0>] (dump_stack+0x24/0x28)
[ 1.898602] [<c091f7a0>] (dump_stack) from [<c003dff4>] (warn_slowpath_common+0x94/0xc0)
[ 1.906753] [<c003dff4>] (warn_slowpath_common) from [<c003e060>] (warn_slowpath_fmt+0x40/0x48)
[ 1.915515] [<c003e060>] (warn_slowpath_fmt) from [<c0561fd8>] (dma_async_device_register+0xe0/0x540)
[ 1.924806] [<c0561fd8>] (dma_async_device_register) from [<c056b3cc>] (cppi41_dma_probe+0x470/0x4c0)
[ 1.934397] [<c056b3cc>] (cppi41_dma_probe) from [<c05f7e6c>] (platform_drv_probe+0x54/0xb4)
[ 1.942924] [<c05f7e6c>] (platform_drv_probe) from [<c05f5bac>] (driver_probe_device+0x14c/0x3a8)
[ 1.951861] [<c05f5bac>] (driver_probe_device) from [<c05f5e58>] (__device_attach+0x50/0x54)
[ 1.960360] [<c05f5e58>] (__device_attach) from [<c05f3c94>] (bus_for_each_drv+0x68/0x9c)
[ 1.968596] [<c05f3c94>] (bus_for_each_drv) from [<c05f59ec>] (device_attach+0x84/0x98)
[ 1.976656] [<c05f59ec>] (device_attach) from [<c05f4e70>] (bus_probe_device+0x94/0xb8)
[ 1.984717] [<c05f4e70>] (bus_probe_device) from [<c05f2cb0>] (device_add+0x3dc/0x59c)
[ 1.992700] [<c05f2cb0>] (device_add) from [<c07a6f5c>] (of_device_add+0x44/0x4c)
[ 2.000242] [<c07a6f5c>] (of_device_add) from [<c07a78d4>] (of_platform_device_create_pdata+0x140/0x234)
[ 2.009788] [<c07a78d4>] (of_platform_device_create_pdata) from [<c07a7af8>] (of_platform_bus_create+0x10c/0x234)
[ 2.020118] [<c07a7af8>] (of_platform_bus_create) from [<c07a7dbc>] (of_platform_populate+0x6c/0xc8)
[ 2.029319] [<c07a7dbc>] (of_platform_populate) from [<c06e83f8>] (am335x_child_probe+0x38/0x54)
[ 2.038168] [<c06e83f8>] (am335x_child_probe) from [<c05f7e6c>] (platform_drv_probe+0x54/0xb4)
[ 2.046840] [<c05f7e6c>] (platform_drv_probe) from [<c05f5bac>] (driver_probe_device+0x14c/0x3a8)
[ 2.055774] [<c05f5bac>] (driver_probe_device) from [<c05f5ef8>] (__driver_attach+0x9c/0xa0)
[ 2.064268] [<c05f5ef8>] (__driver_attach) from [<c05f3bcc>] (bus_for_each_dev+0x70/0xa4)
[ 2.072501] [<c05f3bcc>] (bus_for_each_dev) from [<c05f555c>] (driver_attach+0x2c/0x30)
[ 2.080561] [<c05f555c>] (driver_attach) from [<c05f515c>] (bus_add_driver+0x170/0x22c)
[ 2.088623] [<c05f515c>] (bus_add_driver) from [<c05f6878>] (driver_register+0x88/0x108)
[ 2.096770] [<c05f6878>] (driver_register) from [<c05f7d98>] (__platform_driver_register+0x64/0x6c)
[ 2.105884] [<c05f7d98>] (__platform_driver_register) from [<c0d8df0c>] (am335x_child_init+0x1c/0x20)
[ 2.115171] [<c0d8df0c>] (am335x_child_init) from [<c0008ad8>] (do_one_initcall+0xe8/0x230)
[ 2.123592] [<c0008ad8>] (do_one_initcall) from [<c0d45f90>] (kernel_init_freeable+0x1e0/0x284)
[ 2.132355] [<c0d45f90>] (kernel_init_freeable) from [<c0919044>] (kernel_init+0x1c/0x100)
[ 2.140681] [<c0919044>] (kernel_init) from [<c000f8d0>] (ret_from_fork+0x14/0x24)



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