Noralf Trønnes a89bfc5d9a tinydrm/mipi-dbi: Use dma-safe buffers for all SPI transfers ... Buffers passed to spi_sync() must be dma-safe even for tiny buffers since some SPI controllers use DMA for all transfers. Example splat with CONFIG_DMA_API_DEBUG enabled: [ 23.750467] DMA-API: dw_dmac_pci 0000:00:15.0: device driver maps memory from stack [probable addr=000000001e49185d] [ 23.750529] WARNING: CPU: 1 PID: 1296 at kernel/dma/debug.c:1161 check_for_stack+0xb7/0x190 [ 23.750533] Modules linked in: mmc_block(+) spi_pxa2xx_platform(+) pwm_lpss_pci pwm_lpss spi_pxa2xx_pci sdhci_pci cqhci intel_mrfld_pwrbtn extcon_intel_mrfld sdhci intel_mrfld_adc led_class mmc_core ili9341 mipi_dbi tinydrm backlight ti_ads7950 industrialio_triggered_buffer kfifo_buf intel_soc_pmic_mrfld hci_uart btbcm [ 23.750599] CPU: 1 PID: 1296 Comm: modprobe Not tainted 5.0.0-rc7+ #236 [ 23.750605] Hardware name: Intel Corporation Merrifield/BODEGA BAY, BIOS 542 2015.01.21:18.19.48 [ 23.750620] RIP: 0010:check_for_stack+0xb7/0x190 [ 23.750630] Code: 8b 6d 50 4d 85 ed 75 04 4c 8b 6d 10 48 89 ef e8 2f 8b 44 00 48 89 c6 4a 8d 0c 23 4c 89 ea 48 c7 c7 88 d0 82 b4 e8 40 7c f9 ff <0f> 0b 8b 05 79 00 4b 01 85 c0 74 07 5b 5d 41 5c 41 5d c3 8b 05 54 [ 23.750637] RSP: 0000:ffff97bbc0292fa0 EFLAGS: 00010286 [ 23.750646] RAX: 0000000000000000 RBX: ffff97bbc0290000 RCX: 0000000000000006 [ 23.750652] RDX: 0000000000000007 RSI: 0000000000000002 RDI: ffff94b33e115450 [ 23.750658] RBP: ffff94b33c8578b0 R08: 0000000000000002 R09: 00000000000201c0 [ 23.750664] R10: 00000006ecb0ccc6 R11: 0000000000034f38 R12: 000000000000316c [ 23.750670] R13: ffff94b33c84b250 R14: ffff94b33dedd5a0 R15: 0000000000000001 [ 23.750679] FS: 0000000000000000(0000) GS:ffff94b33e100000(0063) knlGS:00000000f7faf690 [ 23.750686] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 23.750691] CR2: 00000000f7f54faf CR3: 000000000722c000 CR4: 00000000001006e0 [ 23.750696] Call Trace: [ 23.750713] debug_dma_map_sg+0x100/0x340 [ 23.750727] ? dma_direct_map_sg+0x3b/0xb0 [ 23.750739] spi_map_buf+0x25a/0x300 [ 23.750751] __spi_pump_messages+0x2a4/0x680 [ 23.750762] __spi_sync+0x1dd/0x1f0 [ 23.750773] spi_sync+0x26/0x40 [ 23.750790] mipi_dbi_typec3_command_read+0x14d/0x240 [mipi_dbi] [ 23.750802] ? spi_finalize_current_transfer+0x10/0x10 [ 23.750821] mipi_dbi_typec3_command+0x1bc/0x1d0 [mipi_dbi] Reported-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Noralf Trønnes <noralf@tronnes.org> Tested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190222124329.23046-1-noralf@tronnes.org		2019-03-20 12:02:41 +01:00
..
bridge	drm/bridge: dw-hdmi: Add SCDC and TMDS Scrambling support	2019-02-01 13:15:07 +01:00
i2c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
tinydrm	tinydrm/mipi-dbi: Use dma-safe buffers for all SPI transfers	2019-03-20 12:02:41 +01:00
ttm	Merge drm/drm-next into drm-misc-next	2019-02-11 10:35:35 +01:00
amd_asic_type.h	drm/amdgpu: simplify Raven, Raven2, and Picasso handling	2018-09-14 09:38:03 -05:00
ati_pcigart.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
drm_agpsupport.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
drm_atomic.h	drm/atomic: Add drm_atomic_state->duplicated	2019-02-05 18:19:00 -05:00
drm_atomic_helper.h	drm: Fix up drm_atomic_state_helper.[hc] extraction	2018-11-30 16:37:52 +01:00
drm_atomic_state_helper.h	drm: Fix up drm_atomic_state_helper.[hc] extraction	2018-11-30 16:37:52 +01:00
drm_atomic_uapi.h	drm: extract drm_atomic_uapi.c	2018-09-09 14:19:18 +02:00
drm_audio_component.h	ALSA: hda: Make audio component support more generic	2018-07-17 22:25:48 +02:00
drm_auth.h	drm: Add drm_object lease infrastructure [v5]	2017-10-25 16:31:29 +10:00
drm_blend.h	drm: Add per-plane pixel blend mode property	2018-08-24 17:31:37 +01:00
drm_bridge.h	drm: bridge: Constify mode arguments to bridge .mode_set() operation	2019-01-14 03:51:14 +02:00
drm_cache.h	drm: change func to better detect wether swiotlb is needed	2019-02-20 13:29:29 +01:00
drm_client.h	drm: Trivial comment grammar cleanups	2019-02-04 10:21:17 +01:00
drm_color_mgmt.h	drm: Constify drm_color_lut_check()	2019-01-29 23:26:12 +02:00
drm_connector.h	drm: Add HDMI colorspace property	2019-02-19 18:50:55 +01:00
drm_crtc.h	drm/doc: Fix copy paste error in drm_crtc_funcs.destroy()	2019-02-28 14:39:09 +01:00
drm_crtc_helper.h	drm: Split out drm_probe_helper.h	2019-01-24 13:20:42 +01:00
drm_damage_helper.h	drm/damage-helper: Add drm_atomic_helper_damage_merged()	2019-01-17 10:56:54 +01:00
drm_debugfs.h	drm/debugfs: Add kerneldoc	2017-03-24 09:36:06 +01:00
drm_debugfs_crc.h	drm/crc: Only report a single overflow when a CRC fd is opened	2018-07-06 14:57:03 +02:00
drm_device.h	drm/vblank: Allow dynamic per-crtc max_vblank_count	2019-01-14 21:23:55 +02:00
drm_displayid.h
drm_dp_dual_mode_helper.h	drm: Fix LSPCON kernel-doc	2016-10-19 18:20:40 +03:00
drm_dp_helper.h	Merge https://gitlab.freedesktop.org/drm/msm into drm-next	2019-02-20 12:16:37 +10:00
drm_dp_mst_helper.h	Linux 5.0-rc7	2019-02-18 13:27:15 +10:00
drm_drv.h	Merge drm/drm-next into drm-misc-next	2019-03-06 09:22:18 -05:00
drm_dsc.h	drm/dsc: Split DSC PPS and SDP header initialisations	2019-03-05 13:24:34 -05:00
drm_edid.h	drm: Add colorspace info to AVI Infoframe	2019-02-19 18:51:12 +01:00
drm_encoder.h	drm: Add drm/drm_util.h header file	2018-09-09 14:18:11 +02:00
drm_encoder_slave.h	drm: remove include of drmP.h from drm_encoder_slave.h	2019-01-09 22:35:35 +01:00
drm_fb_cma_helper.h	drm/cma-helper: Remove unused fbdev code	2019-01-17 10:56:38 +01:00
drm_fb_helper.h	drm/fb-helper: document remove*_conflicting_framebuffers()	2018-09-07 22:07:49 +02:00
drm_file.h	drm: include idr.h from drm_file.h	2019-01-02 11:37:56 +02:00
drm_fixed.h
drm_flip_work.h	drm/kms-helpers: Use recommened kerneldoc for struct member refs	2017-01-25 16:18:57 +01:00
drm_fourcc.h	drm/fourcc: Add format info helpers for checking YUV sub-sampling	2019-01-18 19:00:18 +01:00
drm_framebuffer.h	drm: make drm_framebuffer.h self contained	2019-01-09 22:11:28 +01:00
drm_gem.h	drm: Add helpers for locking an array of BO reservations.	2019-03-14 09:22:57 -07:00
drm_gem_cma_helper.h	drm: remove drmP.h from drm_gem_cma_helper.h	2019-01-09 22:54:08 +01:00
drm_gem_framebuffer_helper.h	drm/gem-fb-helper: Add drm_gem_fb_create_with_dirty()	2019-01-17 10:56:45 +01:00
drm_gem_shmem_helper.h	drm: Add library for shmem backed GEM objects	2019-03-14 12:06:44 -07:00
drm_hashtab.h	drm: drop extern from function decls	2017-03-24 09:36:06 +01:00
drm_hdcp.h	drm: include types.h from drm_hdcp.h	2019-01-02 11:38:01 +02:00
drm_ioctl.h	drm: remove all control node code	2018-05-03 21:26:32 +02:00
drm_irq.h	drm: Extract drm_vblank.[hc]	2017-06-01 08:02:14 +02:00
drm_lease.h	drm: Add four ioctls for managing drm mode object leases [v7]	2017-10-25 16:31:30 +10:00
drm_legacy.h	drm: un-inline drm_legacy_findmap()	2019-01-02 11:37:11 +02:00
drm_mipi_dsi.h	drm: dsi: Add lane clock rate fields to DSI device	2018-10-24 16:26:35 +02:00
drm_mm.h	drm/mm: Add a search-by-address variant to only inspect a single hole	2018-05-24 15:04:30 +01:00
drm_mode_config.h	drm: Trivial comment grammar cleanups	2019-02-04 10:21:17 +01:00
drm_mode_object.h	drm: remove drm_mode_object_{un/reference} aliases	2018-03-19 09:09:46 -04:00
drm_modes.h	drm/modes: Add DRM_SIMPLE_MODE()	2019-02-21 12:13:42 +01:00
drm_modeset_helper.h	drm: remove drmP.h from drm_modeset_helper.h	2019-02-07 21:48:34 +01:00
drm_modeset_helper_vtables.h	drm: Trivial comment grammar cleanups	2019-02-04 10:21:17 +01:00
drm_modeset_lock.h	drm: Trivial comment grammar cleanups	2019-02-04 10:21:17 +01:00
drm_of.h	drm: of: Export and rename drm_crtc_port_mask()	2018-06-27 21:44:04 +02:00
drm_os_linux.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
drm_panel.h	This is the 4.19-rc6 release	2018-10-04 11:03:34 +10:00
drm_pci.h	drm: drop drm_pcie_get_speed_cap_mask and drm_pcie_get_max_link_width	2018-07-05 16:40:00 -05:00
drm_pciids.h	drm/radeon: change SPDX identifier to MIT	2018-10-15 16:16:12 -05:00
drm_plane.h	drm: Add helper iterator functions for plane fb_damage_clips blob	2018-12-05 10:00:36 +01:00
drm_plane_helper.h	drm: Unexport drm_plane_helper_check_update	2018-10-05 22:45:19 +02:00
drm_prime.h	drm/prime: Add drm_gem_prime_mmap()	2018-11-20 14:54:53 +01:00
drm_print.h	Merge drm/drm-next into drm-misc-next	2018-08-27 10:00:03 -04:00
drm_probe_helper.h	drm: Split out drm_probe_helper.h	2019-01-24 13:20:42 +01:00
drm_property.h	drm: Fix kernel doc for DRM_MODE_PROP_IMMUTABLE	2018-10-03 13:05:12 -07:00
drm_rect.h	drm: Nuke drm_calc_{h,v}scale_relaxed()	2019-02-07 13:14:06 +02:00
drm_scdc_helper.h	drm: Fix warning when building docs for scdc_helper	2017-07-31 14:24:14 +02:00
drm_simple_kms_helper.h	drm: Move simple_display_pipe prepare_fb helper into gem fb helpers	2018-04-24 13:57:22 +02:00
drm_syncobj.h	Merge drm/drm-next into drm-intel-next-queued	2019-01-08 10:50:22 +02:00
drm_sysfs.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
drm_util.h	drm: fix drm_can_sleep() comment	2019-01-21 10:30:12 +01:00
drm_utils.h	drm: export drm_timeout_abs_to_jiffies	2019-03-07 12:00:30 -06:00
drm_vblank.h	drm/vblank: Allow dynamic per-crtc max_vblank_count	2019-01-14 21:23:55 +02:00
drm_vma_manager.h	drm/i915: Prevent writing into a read-only object via a GGTT mmap	2018-07-13 16:14:04 +01:00
drm_writeback.h	drm/atomic: Avoid connector to writeback_connector casts	2018-07-07 07:51:19 +02:00
drmP.h	drm: move EXPORT_SYMBOL_FOR_TESTS_ONLY to drm_util.h	2019-01-14 10:58:37 +01:00
gma_drm.h
gpu_scheduler.h	drm/sched: Rework HW fence processing.	2019-01-25 16:15:36 -05:00
i915_component.h	i915/snd_hdac: I915 subcomponent for the snd_hdac	2019-02-08 16:58:59 +01:00
i915_drm.h	x86/gpu: reserve ICL's graphics stolen memory	2018-07-10 16:28:47 -07:00
i915_pciids.h	drm/i915/cfl: Adding another PCI Device ID.	2019-01-31 08:53:59 -08:00
intel-gtt.h	drm: include kernel.h and agp_backend.h from intel-gtt.h	2019-01-02 11:37:47 +02:00
intel_lpe_audio.h	ALSA: x86: Register multiple PCM devices for the LPE audio card	2017-05-03 16:24:00 +03:00
spsc_queue.h	drm: move amd_gpu_scheduler into common location	2017-12-07 11:51:56 -05:00