<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> <meta name="Generator" content="Microsoft Exchange Server"> <style></style> </head> <body> <div> <div dir="auto">Sorry to say that but your analysis tool is buggy. <div dir="auto"><br> </div> <div dir="auto">The proposed call paths will never trigger.</div> <div dir="auto"><br> </div> <div dir="auto">Regards,</div> <div dir="auto">Christian.</div> </div> <div class="x_gmail_extra"><br> <div class="x_gmail_quote">Am 15.09.2018 10:59 schrieb Jia-Ju Bai <baijiaju1990@gmail.com>:<br type="attribution"> </div> </div> </div> <font size="2"><span style="font-size:11pt;"> <div class="PlainText">The driver may sleep with holding a spinlock.<br> The function call paths (from bottom to top) in Linux-4.17 are:<br> <br> [FUNC] mutex_lock_nested<br> drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c, 1477:<br> mutex_lock_nested in amdgpu_dpm_enable_uvd<br> drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c, 1154:<br> amdgpu_dpm_enable_uvd in amdgpu_uvd_ring_begin_use<br> drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c, 80:<br> [FUNC_PTR]amdgpu_uvd_ring_begin_use in amdgpu_ring_alloc<br> drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c, 199:<br> amdgpu_ring_alloc in amdgpu_virt_kiq_wreg<br> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c, 207:<br> amdgpu_virt_kiq_wreg in amdgpu_mm_wreg<br> drivers/gpu/drm/amd/amdgpu/vi.c, 207:<br> amdgpu_mm_wreg in vi_gc_cac_rreg<br> drivers/gpu/drm/amd/amdgpu/vi.c, 206:<br> _raw_spin_lock_irqsave in vi_gc_cac_rreg<br> <br> [FUNC] mutex_lock_nested<br> drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c, 1477:<br> mutex_lock_nested in amdgpu_dpm_enable_uvd<br> drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c, 1154:<br> amdgpu_dpm_enable_uvd in amdgpu_uvd_ring_begin_use<br> drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c, 80:<br> [FUNC_PTR]amdgpu_uvd_ring_begin_use in amdgpu_ring_alloc<br> drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c, 199:<br> amdgpu_ring_alloc in amdgpu_virt_kiq_wreg<br> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c, 207:<br> amdgpu_virt_kiq_wreg in amdgpu_mm_wreg<br> drivers/gpu/drm/amd/amdgpu/soc15.c, 106:<br> amdgpu_mm_wreg in soc15_pcie_rreg<br> drivers/gpu/drm/amd/amdgpu/soc15.c, 105:<br> _raw_spin_lock_irqsave in soc15_pcie_rreg<br> <br> [FUNC] mutex_lock_nested<br> drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c, 1477:<br> mutex_lock_nested in amdgpu_dpm_enable_uvd<br> drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c, 1154:<br> amdgpu_dpm_enable_uvd in amdgpu_uvd_ring_begin_use<br> drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c, 80:<br> [FUNC_PTR]amdgpu_uvd_ring_begin_use in amdgpu_ring_alloc<br> drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c, 199:<br> amdgpu_ring_alloc in amdgpu_virt_kiq_wreg<br> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c, 207:<br> amdgpu_virt_kiq_wreg in amdgpu_mm_wreg<br> drivers/gpu/drm/amd/amdgpu/cik.c, 139:<br> amdgpu_mm_wreg in cik_uvd_ctx_wreg<br> drivers/gpu/drm/amd/amdgpu/cik.c, 138:<br> _raw_spin_lock_irqsave in cik_uvd_ctx_wreg<br> <br> [FUNC] mutex_lock_nested<br> drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c, 1477:<br> mutex_lock_nested in amdgpu_dpm_enable_uvd<br> drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c, 1154:<br> amdgpu_dpm_enable_uvd in amdgpu_uvd_ring_begin_use<br> drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c, 80:<br> [FUNC_PTR]amdgpu_uvd_ring_begin_use in amdgpu_ring_alloc<br> drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c, 199:<br> amdgpu_ring_alloc in amdgpu_virt_kiq_wreg<br> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c, 207:<br> amdgpu_virt_kiq_wreg in amdgpu_mm_wreg<br> drivers/gpu/drm/amd/amdgpu/dce_v6_0.c, 126:<br> amdgpu_mm_wreg in dce_v6_0_audio_endpt_rreg<br> drivers/gpu/drm/amd/amdgpu/dce_v6_0.c, 125:<br> _raw_spin_lock_irqsave in dce_v6_0_audio_endpt_rreg<br> <br> Note that [FUNC_PTR] means a function pointer call is used.<br> <br> These bugs are found by my static analysis tool DSAC.<br> <br> <br> Best wishes,<br> Jia-Ju Bai<br> </div> </span></font> </body> </html>