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543f8470a9
arm_iommu_release_mapping will auto trigger when driver unregister, so it should not manual release. dump stack: [ 31.493866 ] ------------[ cut here ]------------ [ 31.493889 ] WARNING: CPU: 0 PID: 605 at lib/refcount.c:187 refcount_sub_and_test_checked+0x9c/0xb4 [ 31.493898 ] refcount_t: underflow; use-after-free. [ 31.493907 ] Modules linked in: rk_vcodec(-) [ 31.493924 ] CPU: 0 PID: 605 Comm: rmmod Not tainted 4.19.111 #2047 [ 31.493932 ] Hardware name: Generic DT based system [ 31.493957 ] [<b010f408>] (unwind_backtrace) from [<b010b96c>] (show_stack+0x10/0x14) [ 31.493975 ] [<b010b96c>] (show_stack) from [<b07ed264>] (dump_stack+0x90/0xa4) [ 31.493992 ] [<b07ed264>] (dump_stack) from [<b0125f64>] (__warn+0xfc/0x114) [ 31.494006 ] [<b0125f64>] (__warn) from [<b0125fc0>] (warn_slowpath_fmt+0x44/0x68) [ 31.494020 ] [<b0125fc0>] (warn_slowpath_fmt) from [<b0398f40>] (refcount_sub_and_test_checked+0x9c/0xb4) [ 31.494036 ] [<b0398f40>] (refcount_sub_and_test_checked) from [<b0116730>] (arm_iommu_release_mapping.part.5+0x20/0x48) [ 31.494050 ] [<b0116730>] (arm_iommu_release_mapping.part.5) from [<b0117408>] (arch_teardown_dma_ops+0x2c/0x38) [ 31.494065 ] [<b0117408>] (arch_teardown_dma_ops) from [<b047a87c>] (device_release_driver_internal+0xf4/0x19c) [ 31.494081 ] [<b047a87c>] (device_release_driver_internal) from [<b047a980>] (driver_detach+0x44/0x80) [ 31.494094 ] [<b047a980>] (driver_detach) from [<b04796b4>] (bus_remove_driver+0x4c/0xa0) [ 31.494120 ] [<b04796b4>] (bus_remove_driver) from [<af005ff8>] (mpp_service_exit+0x3c/0x1044 [rk_vcodec]) [ 31.494140 ] [<af005ff8>] (mpp_service_exit [rk_vcodec]) from [<b019c97c>] (sys_delete_module+0x190/0x1f0) [ 31.494154 ] [<b019c97c>] (sys_delete_module) from [<b0101000>] (ret_fast_syscall+0x0/0x4c) [ 31.494162 ] Exception stack(0xed62ffa8 to 0xed62fff0) [ 31.494172 ] ffa0: 00025a04 765f6b72 ae982c08 00000880 00000000 ae982e88 [ 31.494183 ] ffc0: 00025a04 765f6b72 65646f63 00000081 000c46a4 00000000 a6f49000 00000000 [ 31.494191 ] ffe0: ae982c00 ae982bf0 000258f8 a6ea31b0 [ 31.494288 ] ---[ end trace 6bdf082e7c4aa12d ]--- Change-Id: Ib4a057087b1521a5591c12909b6d78b5f90f3882 Signed-off-by: Ding Wei <leo.ding@rock-chips.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.
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.