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de15e6231e
In concurrency usecase and reboot scenario we are seeing muliple crashes related to iommu_map/iommu_unamp of core->fw.iommu_domain. In one case we are seeing "Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008" crash, this is because of core->fw.iommu_domain in venus_firmware_deinit() and trying to map in venus_boot() during venus_sys_error_handler() Call trace: __iommu_map+0x4c/0x348 iommu_map+0x5c/0x70 venus_boot+0x184/0x230 [venus_core] venus_sys_error_handler+0xa0/0x14c [venus_core] process_one_work+0x210/0x3d0 worker_thread+0x248/0x3f4 kthread+0x11c/0x12c ret_from_fork+0x10/0x18 In second case we are seeing "Unable to handle kernel paging request at virtual address 006b6b6b6b6b6b9b" crash, this is because of unmapping iommu domain which is already unmapped. Call trace: venus_remove+0xf8/0x108 [venus_core] venus_core_shutdown+0x1c/0x34 [venus_core] platform_drv_shutdown+0x28/0x34 device_shutdown+0x154/0x1fc kernel_restart_prepare+0x40/0x4c kernel_restart+0x1c/0x64 __arm64_sys_reboot+0x190/0x238 el0_svc_common+0xa4/0x154 el0_svc_compat_handler+0x2c/0x38 el0_svc_compat+0x8/0x10 Signed-off-by: Mansur Alisha Shaik <mansur@codeaurora.org> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.