Skip to content

L
linux
Switch branch/tag
  1. 07 Sep, 2020 1 commit
    • Marek Vasut's avatar
      spi: stm32: Rate-limit the 'Communication suspended' message · ea8be08c
      Marek Vasut authored 
      The 'spi_stm32 44004000.spi: Communication suspended' message means that
when using PIO, the kernel did not read the FIFO fast enough and so the
SPI controller paused the transfer. Currently, this is printed on every
single such event, so if the kernel is busy and the controller is pausing
the transfers often, the kernel will be all the more busy scrolling this
message into the log buffer every few milliseconds. That is not helpful.

Instead, rate-limit the message and print it every once in a while. It is
not possible to use the default dev_warn_ratelimited(), because that is
still too verbose, as it prints 10 lines (DEFAULT_RATELIMIT_BURST) every
5 seconds (DEFAULT_RATELIMIT_INTERVAL). The policy here is to print 1 line
every 50 seconds (DEFAULT_RATELIMIT_INTERVAL * 10), because 1 line is more
than enough and the cycles saved on printing are better left to the CPU to
handle the SPI. However, dev_warn_once() is also not useful, as the user
should be aware that this condition is possibly recurring or ongoing. Thus
the custom rate-limit policy.

Finally, turn the message from dev_warn() to dev_dbg(), since the system
does not suffer any sort of malfunction if this message appears, it is
just slowing down. This further reduces the printing into the log buffer
and frees the CPU to do useful work.

Fixes: dcbe0d84 ("spi: add driver for STM32 SPI controller")
Signed-off-by: default avatarMarek Vasut <marex@denx.de>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Cc: Amelie Delaunay <amelie.delaunay@st.com>
Cc: Antonio Borneo <borneo.antonio@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20200905151913.117775-1-marex@denx.deSigned-off-by: default avatarMark Brown <broonie@kernel.org>
      ea8be08c
  3. 02 Sep, 2020 1 commit
    • Vincent Whitchurch's avatar
      spi: spi-loopback-test: Fix out-of-bounds read · 837ba18d
      Vincent Whitchurch authored 
      The "tx/rx-transfer - crossing PAGE_SIZE" test always fails when
len=131071 and rx_offset >= 5:

 spi-loopback-test spi0.0: Running test tx/rx-transfer - crossing PAGE_SIZE
 ...
   with iteration values: len = 131071, tx_off = 0, rx_off = 3
   with iteration values: len = 131071, tx_off = 0, rx_off = 4
   with iteration values: len = 131071, tx_off = 0, rx_off = 5
 loopback strangeness - rx changed outside of allowed range at: ...a4321000
   spi_msg@ffffffd5a4157690
     frame_length:  131071
     actual_length: 131071
     spi_transfer@ffffffd5a41576f8
       len:    131071
       tx_buf: ffffffd5a4340ffc

Note that rx_offset > 3 can only occur if the SPI controller driver sets
->dma_alignment to a higher value than 4, so most SPI controller drivers
are not affect.

The allocated Rx buffer is of size SPI_TEST_MAX_SIZE_PLUS, which is 132
KiB (assuming 4 KiB pages).  This test uses an initial offset into the
rx_buf of PAGE_SIZE - 4, and a len of 131071, so the range expected to
be written in this transfer ends at (4096 - 4) + 5 + 131071 == 132 KiB,
which is also the end of the allocated buffer.  But the code which
verifies the content of the buffer reads a byte beyond the allocated
buffer and spuriously fails because this out-of-bounds read doesn't
return the expected value.

Fix this by using ITERATE_LEN instead of ITERATE_MAX_LEN to avoid
testing sizes which cause out-of-bounds reads.
Signed-off-by: default avatarVincent Whitchurch <vincent.whitchurch@axis.com>
Link: https://lore.kernel.org/r/20200902132341.7079-1-vincent.whitchurch@axis.comSigned-off-by: default avatarMark Brown <broonie@kernel.org>
      837ba18d
  5. 25 Aug, 2020 1 commit
  7. 24 Aug, 2020 1 commit
  9. 10 Aug, 2020 7 commits
  11. 05 Aug, 2020 1 commit
  13. 03 Aug, 2020 1 commit
    • Lukas Wunner's avatar
      spi: Prevent adding devices below an unregistering controller · ddf75be4
      Lukas Wunner authored 
      CONFIG_OF_DYNAMIC and CONFIG_ACPI allow adding SPI devices at runtime
using a DeviceTree overlay or DSDT patch.  CONFIG_SPI_SLAVE allows the
same via sysfs.

But there are no precautions to prevent adding a device below a
controller that's being removed.  Such a device is unusable and may not
even be able to unbind cleanly as it becomes inaccessible once the
controller has been torn down.  E.g. it is then impossible to quiesce
the device's interrupt.

of_spi_notify() and acpi_spi_notify() do hold a ref on the controller,
but otherwise run lockless against spi_unregister_controller().

Fix by holding the spi_add_lock in spi_unregister_controller() and
bailing out of spi_add_device() if the controller has been unregistered
concurrently.

Fixes: ce79d54a ("spi/of: Add OF notifier handler")
Signed-off-by: default avatarLukas Wunner <lukas@wunner.de>
Cc: stable@vger.kernel.org # v3.19+
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Octavian Purdila <octavian.purdila@intel.com>
Cc: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Link: https://lore.kernel.org/r/a8c3205088a969dc8410eec1eba9aface60f36af.1596451035.git.lukas@wunner.deSigned-off-by: default avatarMark Brown <broonie@kernel.org>
      ddf75be4
  15. 29 Jul, 2020 5 commits
    • Mark Brown's avatar
      Merge series "Some bug fix for lpspi" from Clark Wang <xiaoning.wang@nxp.com>: · 1d5cd4e7
      Mark Brown authored 
      Hi,

This patchset mainly fixes some recently discovered problems about CS for
LPSPI module on i.MX8DXLEVK.

Add the dt-bindings description for the new property.

Clark Wang (4):
  spi: lpspi: Fix kernel warning dump when probe fail after calling
    spi_register
  spi: lpspi: remove unused fsl_lpspi->chipselect
  spi: lpspi: fix using CS discontinuously on i.MX8DXLEVK
  dt-bindings: lpspi: New property in document DT bindings for LPSPI

 .../bindings/spi/spi-fsl-lpspi.yaml           |  7 ++++++
 drivers/spi/spi-fsl-lpspi.c                   | 25 +++++++++++--------
 2 files changed, 21 insertions(+), 11 deletions(-)

--
2.17.1
      1d5cd4e7
    • Clark Wang's avatar
      dt-bindings: lpspi: New property in document DT bindings for LPSPI · 7ac9bbf6
      Clark Wang authored 
      Add "fsl,spi-only-use-cs1-sel" to fit i.MX8DXL-EVK.
Spi common code does not support use of CS signals discontinuously.
It only uses CS1 without using CS0. So, add this property to re-config
chipselect value.
Signed-off-by: default avatarClark Wang <xiaoning.wang@nxp.com>
Link: https://lore.kernel.org/r/20200727031513.31774-1-xiaoning.wang@nxp.comSigned-off-by: default avatarMark Brown <broonie@kernel.org>
      7ac9bbf6
    • Clark Wang's avatar
      spi: lpspi: fix using CS discontinuously on i.MX8DXLEVK · 2a052590
      Clark Wang authored 
      SPI common code does not support using CS discontinuously for now.
However, i.MX8DXL-EVK only uses CS1 without CS0. Therefore, add a flag
is_only_cs1 to set the correct TCR[PCS].
Signed-off-by: default avatarClark Wang <xiaoning.wang@nxp.com>
Link: https://lore.kernel.org/r/20200727031448.31661-4-xiaoning.wang@nxp.comSigned-off-by: default avatarMark Brown <broonie@kernel.org>
      2a052590
    • Clark Wang's avatar
      spi: lpspi: remove unused fsl_lpspi->chipselect · 768ba490
      Clark Wang authored 
      The cs-gpio is initailized by spi_get_gpio_descs() now. Remove the
chipselect.
Signed-off-by: default avatarClark Wang <xiaoning.wang@nxp.com>
Link: https://lore.kernel.org/r/20200727031448.31661-3-xiaoning.wang@nxp.comSigned-off-by: default avatarMark Brown <broonie@kernel.org>
      768ba490
    • Clark Wang's avatar
      spi: lpspi: Fix kernel warning dump when probe fail after calling spi_register · 16d79185
      Clark Wang authored 
      Calling devm_spi_register_controller() too early will cause problem.
When probe failed occurs after calling devm_spi_register_controller(),
the call of spi_controller_put() will trigger the following warning dump.

[    2.092138] ------------[ cut here ]------------
[    2.096876] kernfs: can not remove 'uevent', no directory
[    2.102440] WARNING: CPU: 0 PID: 181 at fs/kernfs/dir.c:1503 kernfs_remove_by_name_ns+0xa0/0xb0
[    2.111142] Modules linked in:
[    2.114207] CPU: 0 PID: 181 Comm: kworker/0:7 Not tainted 5.4.24-05024-g775c6e8a738c-dirty #1314
[    2.122991] Hardware name: Freescale i.MX8DXL EVK (DT)
[    2.128141] Workqueue: events deferred_probe_work_func
[    2.133281] pstate: 60000005 (nZCv daif -PAN -UAO)
[    2.138076] pc : kernfs_remove_by_name_ns+0xa0/0xb0
[    2.142958] lr : kernfs_remove_by_name_ns+0xa0/0xb0
[    2.147837] sp : ffff8000122bba70
[    2.151145] x29: ffff8000122bba70 x28: ffff8000119d6000
[    2.156462] x27: 0000000000000000 x26: ffff800011edbce8
[    2.161779] x25: 0000000000000000 x24: ffff00003ae4f700
[    2.167096] x23: ffff000010184c10 x22: ffff00003a3d6200
[    2.172412] x21: ffff800011a464a8 x20: ffff000010126a68
[    2.177729] x19: ffff00003ae5c800 x18: 000000000000000e
[    2.183046] x17: 0000000000000001 x16: 0000000000000019
[    2.188362] x15: 0000000000000004 x14: 000000000000004c
[    2.193679] x13: 0000000000000000 x12: 0000000000000001
[    2.198996] x11: 0000000000000000 x10: 00000000000009c0
[    2.204313] x9 : ffff8000122bb7a0 x8 : ffff00003a3d6c20
[    2.209630] x7 : ffff00003a3d6380 x6 : 0000000000000001
[    2.214946] x5 : 0000000000000001 x4 : ffff00003a05eb18
[    2.220263] x3 : 0000000000000005 x2 : ffff8000119f1c48
[    2.225580] x1 : 2bcbda323bf5a800 x0 : 0000000000000000
[    2.230898] Call trace:
[    2.233345]  kernfs_remove_by_name_ns+0xa0/0xb0
[    2.237879]  sysfs_remove_file_ns+0x14/0x20
[    2.242065]  device_del+0x12c/0x348
[    2.245555]  device_unregister+0x14/0x30
[    2.249492]  spi_unregister_controller+0xac/0x120
[    2.254201]  devm_spi_unregister+0x10/0x18
[    2.258304]  release_nodes+0x1a8/0x220
[    2.262055]  devres_release_all+0x34/0x58
[    2.266069]  really_probe+0x1b8/0x318
[    2.269733]  driver_probe_device+0x54/0xe8
[    2.273833]  __device_attach_driver+0x80/0xb8
[    2.278194]  bus_for_each_drv+0x74/0xc0
[    2.282034]  __device_attach+0xdc/0x138
[    2.285876]  device_initial_probe+0x10/0x18
[    2.290063]  bus_probe_device+0x90/0x98
[    2.293901]  deferred_probe_work_func+0x64/0x98
[    2.298442]  process_one_work+0x198/0x320
[    2.302451]  worker_thread+0x1f0/0x420
[    2.306208]  kthread+0xf0/0x120
[    2.309352]  ret_from_fork+0x10/0x18
[    2.312927] ---[ end trace 58abcdfae01bd3c7 ]---

So put this function at the end of the probe sequence.
Signed-off-by: default avatarClark Wang <xiaoning.wang@nxp.com>
Link: https://lore.kernel.org/r/20200727031448.31661-2-xiaoning.wang@nxp.comSigned-off-by: default avatarMark Brown <broonie@kernel.org>
      16d79185
  17. 28 Jul, 2020 5 commits
  19. 27 Jul, 2020 3 commits
  21. 22 Jul, 2020 14 commits
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7