On Tue, 12 Dec 2023 10:21:58 +0800, Rex Zhang wrote:
> Task may be rescheduled within dma_free_coherent(). So dma_free_coherent()
> can't be called between spin_lock() and spin_unlock() to avoid Call Trace:
> Call Trace:
> <TASK>
> dump_stack_lvl+0x37/0x50
> __might_resched+0x16a/0x1c0
> vunmap+0x2c/0x70
> __iommu_dma_free+0x96/0x100
> idxd_device_evl_free+0xd5/0x100 [idxd]
> device_release_driver_internal+0x197/0x200
> unbind_store+0xa1/0xb0
> kernfs_fop_write_iter+0x120/0x1c0
> vfs_write+0x2d3/0x400
> ksys_write+0x63/0xe0
> do_syscall_64+0x44/0xa0
> entry_SYSCALL_64_after_hwframe+0x6e/0xd8
> Move it out of the context.
>
> [...]
Applied, thanks!
[1/1] dmaengine: idxd: Move dma_free_coherent() out of spinlocked context
commit: e271c0ba3f919c48e90c64b703538fbb7865cb63
Best regards,
--
~Vinod
