On Wed, Aug 7, 2019 at 5:31 PM Fabio Estevam <festevam@xxxxxxxxx> wrote:
>
> When booting with the DMA driver as module (such as CONFIG_FSL_EDMA=m)
> the following endlessly clk warnings are seen:
>
> [ 153.077831] ------------[ cut here ]------------
> [ 153.082528] WARNING: CPU: 0 PID: 15 at drivers/clk/clk.c:924 clk_core_disable_lock+0x18/0x24
> [ 153.093077] i2c0 already disabled
> [ 153.096416] Modules linked in:
> [ 153.099521] CPU: 0 PID: 15 Comm: kworker/0:1 Tainted: G W 5.2.0+ #321
> [ 153.107290] Hardware name: Freescale Vybrid VF5xx/VF6xx (Device Tree)
> [ 153.113772] Workqueue: events deferred_probe_work_func
> [ 153.118979] [<c0019560>] (unwind_backtrace) from [<c0014734>] (show_stack+0x10/0x14)
> [ 153.126778] [<c0014734>] (show_stack) from [<c083f8dc>] (dump_stack+0x9c/0xd4)
> [ 153.134051] [<c083f8dc>] (dump_stack) from [<c0031154>] (__warn+0xf8/0x124)
> [ 153.141056] [<c0031154>] (__warn) from [<c0031248>] (warn_slowpath_fmt+0x38/0x48)
> [ 153.148580] [<c0031248>] (warn_slowpath_fmt) from [<c040fde0>] (clk_core_disable_lock+0x18/0x24)
> [ 153.157413] [<c040fde0>] (clk_core_disable_lock) from [<c058f520>] (i2c_imx_probe+0x554/0x6ec)
> [ 153.166076] [<c058f520>] (i2c_imx_probe) from [<c04b9178>] (platform_drv_probe+0x48/0x98)
> [ 153.174297] [<c04b9178>] (platform_drv_probe) from [<c04b7298>] (really_probe+0x1d8/0x2c0)
> [ 153.182605] [<c04b7298>] (really_probe) from [<c04b7554>] (driver_probe_device+0x5c/0x174)
> [ 153.190909] [<c04b7554>] (driver_probe_device) from [<c04b58c8>] (bus_for_each_drv+0x44/0x8c)
> [ 153.199480] [<c04b58c8>] (bus_for_each_drv) from [<c04b746c>] (__device_attach+0xa0/0x108)
> [ 153.207782] [<c04b746c>] (__device_attach) from [<c04b65a4>] (bus_probe_device+0x88/0x90)
> [ 153.215999] [<c04b65a4>] (bus_probe_device) from [<c04b6a04>] (deferred_probe_work_func+0x60/0x90)
> [ 153.225003] [<c04b6a04>] (deferred_probe_work_func) from [<c004f190>] (process_one_work+0x204/0x634)
> [ 153.234178] [<c004f190>] (process_one_work) from [<c004f618>] (worker_thread+0x20/0x484)
> [ 153.242315] [<c004f618>] (worker_thread) from [<c0055c2c>] (kthread+0x118/0x150)
> [ 153.249758] [<c0055c2c>] (kthread) from [<c00090b4>] (ret_from_fork+0x14/0x20)
> [ 153.257006] Exception stack(0xdde43fb0 to 0xdde43ff8)
> [ 153.262095] 3fa0: 00000000 00000000 00000000 00000000
> [ 153.270306] 3fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> [ 153.278520] 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000
> [ 153.285159] irq event stamp: 3323022
> [ 153.288787] hardirqs last enabled at (3323021): [<c0861c4c>] _raw_spin_unlock_irq+0x24/0x2c
> [ 153.297261] hardirqs last disabled at (3323022): [<c040d7a0>] clk_enable_lock+0x10/0x124
> [ 153.305392] softirqs last enabled at (3322092): [<c000a504>] __do_softirq+0x344/0x540
> [ 153.313352] softirqs last disabled at (3322081): [<c00385c0>] irq_exit+0x10c/0x128
> [ 153.320946] ---[ end trace a506731ccd9bd703 ]---
>
> When the DMA driver is built as module then dma_request_chan() returns
> -EPROBE_DEFER, so let's treat this case in the same way as
> "there is no DMA support" and make i2c_imx_dma_request() return success.
>
> Reported-by: Russell King <linux@xxxxxxxxxxxxxxx>
> Fixes: e1ab9a468e3b ("i2c: imx: improve the error handling in i2c_imx_dma_request()")
> Signed-off-by: Fabio Estevam <festevam@xxxxxxxxx>
Just learned that Andrey has already submitted a fix for this same problem:
https://lore.kernel.org/linux-arm-kernel/20190609055658.3446-1-andrew.smirnov@xxxxxxxxx/
I think we can go with Andrey's solution.
Maybe Andrey could resend it with the Fixes tag so that it can be
backported to stable.
Thanks
