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In case of GuC initialization failure we may continue with driver load, but we wrongly assume that GuC is fully functional. This leads to the BUG as we attempt to access non-existing log vma. [26386.121085] BUG: unable to handle kernel NULL pointer dereference at 00000000000000a0 [26386.121225] IP: guc_log_runtime_create+0x23/0xe0 [i915] [26386.121763] Call Trace: [26386.121870] guc_log_late_setup+0xfd/0x140 [i915] [26386.121969] i915_driver_load+0x7ab/0x1730 [i915] [26386.122069] i915_pci_probe+0x2d/0x90 [i915] [26386.122089] pci_device_probe+0x9c/0x120 [26386.122107] driver_probe_device+0x2a9/0x490 [26386.122126] __driver_attach+0xd9/0xe0 [26386.122143] ? driver_probe_device+0x490/0x490 [26386.122158] bus_for_each_dev+0x57/0x90 [26386.122175] bus_add_driver+0x1eb/0x260 [26386.122190] ? 0xffffffffa069a000 [26386.122206] driver_register+0x52/0xc0 [26386.122220] ? 0xffffffffa069a000 [26386.122234] do_one_initcall+0x39/0x170 [26386.122252] ? kmem_cache_alloc_trace+0x1fd/0x2e0 [26386.122273] do_init_module+0x56/0x1ec [26386.122289] load_module+0x219e/0x2550 [26386.122309] ? vfs_read+0x121/0x140 [26386.122331] ? SyS_finit_module+0xa5/0xe0 [26386.122346] SyS_finit_module+0xa5/0xe0 [26386.122371] entry_SYSCALL_64_fastpath+0x22/0x8f Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Michal Winiarski <michal.winiarski@intel.com> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180131173241.19704-4-michal.wajdeczko@intel.com Reviewed-by: Sagar Arun Kamble <sagar.a.kamble@intel.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> |
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| fs | ||
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| Makefile | ||
| README | ||
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.