ab8529b0cd
After queue unmap or remove from MES successfully, free queue sysfs entries, doorbell and remove from queue list. Otherwise, application may destroy queue again, cause below kernel warning or crash backtrace. For outstanding queues, either application forget to destroy or failed to destroy, kfd_process_notifier_release will remove queue sysfs entries, kfd_process_wq_release will free queue doorbell. v2: decrement_queue_count for MES queue refcount_t: underflow; use-after-free. WARNING: CPU: 7 PID: 3053 at lib/refcount.c:28 Call Trace: kobject_put+0xd6/0x1a0 kfd_procfs_del_queue+0x27/0x30 [amdgpu] pqm_destroy_queue+0xeb/0x240 [amdgpu] kfd_ioctl_destroy_queue+0x32/0x70 [amdgpu] kfd_ioctl+0x27d/0x500 [amdgpu] do_syscall_64+0x35/0x80 WARNING: CPU: 2 PID: 3053 at drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_device_queue_manager.c:400 Call Trace: deallocate_doorbell.isra.0+0x39/0x40 [amdgpu] destroy_queue_cpsch+0xb3/0x270 [amdgpu] pqm_destroy_queue+0x108/0x240 [amdgpu] kfd_ioctl_destroy_queue+0x32/0x70 [amdgpu] kfd_ioctl+0x27d/0x500 [amdgpu] general protection fault, probably for non-canonical address 0xdead000000000108: Call Trace: pqm_destroy_queue+0xf0/0x200 [amdgpu] kfd_ioctl_destroy_queue+0x2f/0x60 [amdgpu] kfd_ioctl+0x19b/0x600 [amdgpu] Signed-off-by: Philip Yang <Philip.Yang@amd.com> Reviewed-by: Graham Sider <Graham.Sider@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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.