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| author | Mark Brown <broonie@kernel.org> | 2021-09-20 15:56:58 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2021-09-21 15:23:35 +0100 |
| commit | ffb1e76f4f32d2b8ea4189df0484980370476395 (patch) | |
| tree | c62376eab558809973dc5b71806df07c388bfc1a /arch/riscv/kernel/stacktrace.c | |
| parent | 2bab94090b01bc593d8bc25f68df41f198721173 (diff) | |
| parent | e4e737bb5c170df6135a127739a9e6148ee3da82 (diff) | |
Merge tag 'v5.15-rc2' into spi-5.15
Linux 5.15-rc2
Diffstat (limited to 'arch/riscv/kernel/stacktrace.c')
| -rw-r--r-- | arch/riscv/kernel/stacktrace.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/riscv/kernel/stacktrace.c b/arch/riscv/kernel/stacktrace.c index ff467b98c3e3..315db3d0229b 100644 --- a/arch/riscv/kernel/stacktrace.c +++ b/arch/riscv/kernel/stacktrace.c @@ -27,7 +27,7 @@ void notrace walk_stackframe(struct task_struct *task, struct pt_regs *regs, fp = frame_pointer(regs); sp = user_stack_pointer(regs); pc = instruction_pointer(regs); - } else if (task == current) { + } else if (task == NULL || task == current) { fp = (unsigned long)__builtin_frame_address(1); sp = (unsigned long)__builtin_frame_address(0); pc = (unsigned long)__builtin_return_address(0); @@ -132,8 +132,12 @@ unsigned long get_wchan(struct task_struct *task) { unsigned long pc = 0; - if (likely(task && task != current && !task_is_running(task))) + if (likely(task && task != current && !task_is_running(task))) { + if (!try_get_task_stack(task)) + return 0; walk_stackframe(task, NULL, save_wchan, &pc); + put_task_stack(task); + } return pc; } |