This patch replaces kzalloc's flag from GFP_KERNEL to GFP_ATOMIC to avoid sleeping in atomic context. Below is the stack trace: BUG: sleeping function called from invalid context at mm/slab.h:*** in_atomic(): 1, irqs_disabled(): 0, pid: 1137, name: DrmThread CPU: 1 PID: 1137 Comm: DrmThread Tainted: G W 4.14.43 #10 Call Trace: dump_stack+0x4d/0x63 ___might_sleep+0x11f/0x12e __kmalloc+0x76/0x126 amdgpu_atom_execute_table_locked+0xfc/0x285 amdgpu_atom_execute_table+0x5d/0x72 transmitter_control_v1_5+0xef/0x11a hwss_edp_backlight_control+0x132/0x151 dce110_disable_stream+0x133/0x16e core_link_disable_stream+0x1c5/0x23b dce110_reset_hw_ctx_wrap+0xb4/0x1aa dce110_apply_ctx_to_hw+0x4e/0x6da ? generic_reg_get+0x1f/0x33 dc_commit_state+0x33f/0x3d2 amdgpu_dm_atomic_commit_tail+0x2cf/0x5d2 ? wait_for_common+0x5b/0x69 commit_tail+0x42/0x64 drm_atomic_helper_commit+0xdc/0xf9 drm_atomic_helper_set_config+0x5c/0x76 __drm_mode_set_config_internal+0x64/0x105 drm_mode_setcrtc+0x474/0x56f ? drm_mode_getcrtc+0x155/0x155 drm_ioctl_kernel+0x6c/0xa8 drm_ioctl+0x267/0x353 ? drm_mode_getcrtc+0x155/0x155 amdgpu_drm_ioctl+0x4f/0x7f vfs_ioctl+0x21/0x2f do_vfs_ioctl+0x4c4/0x4e7 ? security_file_ioctl+0x3b/0x4f SyS_ioctl+0x57/0x79 do_syscall_64+0x64/0x72 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 V2: Added stack trace in commit message. Signed-off-by: Shirish S <shirish.s at amd.com> --- drivers/gpu/drm/amd/amdgpu/atom.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/atom.c b/drivers/gpu/drm/amd/amdgpu/atom.c index bfd98f0..da4558c 100644 --- a/drivers/gpu/drm/amd/amdgpu/atom.c +++ b/drivers/gpu/drm/amd/amdgpu/atom.c @@ -1221,7 +1221,7 @@ static int amdgpu_atom_execute_table_locked(struct atom_context *ctx, int index, ectx.abort = false; ectx.last_jump = 0; if (ws) - ectx.ws = kzalloc(4 * ws, GFP_KERNEL); + ectx.ws = kzalloc(4 * ws, GFP_ATOMIC); else ectx.ws = NULL; -- 2.7.4
