linux-stable.git/drivers/tty/serial, branch v4.19.53

dmaengine: idma64: Use actual device for DMA transfers

2019-06-15T09:54:10+00:00

[ Upstream commit 5ba846b1ee0792f5a596b9b0b86d6e8cdebfab06 ]

Intel IOMMU, when enabled, tries to find the domain of the device,
assuming it's a PCI one, during DMA operations, such as mapping or
unmapping. Since we are splitting the actual PCI device to couple of
children via MFD framework (see drivers/mfd/intel-lpss.c for details),
the DMA device appears to be a platform one, and thus not an actual one
that performs DMA. In a such situation IOMMU can't find or allocate
a proper domain for its operations. As a result, all DMA operations are
failed.

In order to fix this, supply parent of the platform device
to the DMA engine framework and fix filter functions accordingly.

We may rely on the fact that parent is a real PCI device, because no
other configuration is present in the wild.

Signed-off-by: Andy Shevchenko 
Acked-by: Mark Brown 
Acked-by: Greg Kroah-Hartman  [for tty parts]
Signed-off-by: Vinod Koul 
Signed-off-by: Sasha Levin

TTY: serial_core, add ->install

2019-06-11T10:20:56+00:00

commit 4cdd17ba1dff20ffc99fdbd2e6f0201fc7fe67df upstream.

We need to compute the uart state only on the first open. This is
usually what is done in the ->install hook. serial_core used to do this
in ->open on every open. So move it to ->install.

As a side effect, it ensures the state is set properly in the window
after tty_init_dev is called, but before uart_open. This fixes a bunch
of races between tty_open and flush_to_ldisc we were dealing with
recently.

One of such bugs was attempted to fix in commit fedb5760648a (serial:
fix race between flush_to_ldisc and tty_open), but it only took care of
a couple of functions (uart_start and uart_unthrottle).  I was able to
reproduce the crash on a SLE system, but in uart_write_room which is
also called from flush_to_ldisc via process_echoes. I was *unable* to
reproduce the bug locally. It is due to having this patch in my queue
since 2012!

 general protection fault: 0000 [#1] SMP KASAN PTI
 CPU: 1 PID: 5 Comm: kworker/u4:0 Tainted: G             L 4.12.14-396-default #1 SLE15-SP1 (unreleased)
 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-0-ga698c89-prebuilt.qemu.org 04/01/2014
 Workqueue: events_unbound flush_to_ldisc
 task: ffff8800427d8040 task.stack: ffff8800427f0000
 RIP: 0010:uart_write_room+0xc4/0x590
 RSP: 0018:ffff8800427f7088 EFLAGS: 00010202
 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
 RDX: 000000000000002f RSI: 00000000000000ee RDI: ffff88003888bd90
 RBP: ffffffffb9545850 R08: 0000000000000001 R09: 0000000000000400
 R10: ffff8800427d825c R11: 000000000000006e R12: 1ffff100084fee12
 R13: ffffc900004c5000 R14: ffff88003888bb28 R15: 0000000000000178
 FS:  0000000000000000(0000) GS:ffff880043300000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 0000561da0794148 CR3: 000000000ebf4000 CR4: 00000000000006e0
 Call Trace:
  tty_write_room+0x6d/0xc0
  __process_echoes+0x55/0x870
  n_tty_receive_buf_common+0x105e/0x26d0
  tty_ldisc_receive_buf+0xb7/0x1c0
  tty_port_default_receive_buf+0x107/0x180
  flush_to_ldisc+0x35d/0x5c0
...

0 in rbx means tty->driver_data is NULL in uart_write_room. 0x178 is
tried to be dereferenced (0x178 >> 3 is 0x2f in rdx) at
uart_write_room+0xc4. 0x178 is exactly (struct uart_state *)NULL->refcount
used in uart_port_lock from uart_write_room.

So revert the upstream commit here as my local patch should fix the
whole family.

Signed-off-by: Jiri Slaby 
Cc: Li RongQing 
Cc: Wang Li 
Cc: Zhang Yu 
Cc: Greg Kroah-Hartman 
Cc: stable 
Signed-off-by: Greg Kroah-Hartman

serial: sh-sci: disable DMA for uart_console

2019-06-09T07:17:21+00:00

commit 099506cbbc79c0bd52b19cb6b930f256dabc3950 upstream.

As noted in commit 84b40e3b57ee ("serial: 8250: omap: Disable DMA for
console UART"), UART console lines use low-level PIO only access functions
which will conflict with use of the line when DMA is enabled, e.g. when
the console line is also used for systemd messages. So disable DMA
support for UART console lines.

Reported-by: Michael Rodin 
Link: https://patchwork.kernel.org/patch/10929511/
Tested-by: Eugeniu Rosca 
Reviewed-by: Simon Horman 
Reviewed-by: Wolfram Sang 
Reviewed-by: Geert Uytterhoeven 
Cc: stable@vger.kernel.org
Signed-off-by: George G. Davis 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Greg Kroah-Hartman

tty: max310x: Fix external crystal register setup

2019-06-09T07:17:19+00:00

commit 5d24f455c182d5116dd5db8e1dc501115ecc9c2c upstream.

The datasheet states:

  Bit 4: ClockEnSet the ClockEn bit high to enable an external clocking
(crystal or clock generator at XIN). Set the ClockEn bit to 0 to disable
clocking
  Bit 1: CrystalEnSet the CrystalEn bit high to enable the crystal
oscillator. When using an external clock source at XIN, CrystalEn must
be set low.

The bit 4, MAX310X_CLKSRC_EXTCLK_BIT, should be set and was not.

This was required to make the MAX3107 with an external crystal on our
board able to send or receive data.

Signed-off-by: Joe Burmeister 
Cc: stable 
Signed-off-by: Greg Kroah-Hartman

tty: serial: msm_serial: Fix XON/XOFF

2019-06-09T07:17:19+00:00

commit 61c0e37950b88bad590056286c1d766b1f167f4e upstream.

When the tty layer requests the uart to throttle, the current code
executing in msm_serial will trigger "Bad mode in Error Handler" and
generate an invalid stack frame in pstore before rebooting (that is if
pstore is indeed configured: otherwise the user shall just notice a
reboot with no further information dumped to the console).

This patch replaces the PIO byte accessor with the word accessor
already used in PIO mode.

Fixes: 68252424a7c7 ("tty: serial: msm: Support big-endian CPUs")
Cc: stable@vger.kernel.org
Signed-off-by: Jorge Ramirez-Ortiz 
Reviewed-by: Bjorn Andersson 
Reviewed-by: Stephen Boyd 
Signed-off-by: Greg Kroah-Hartman

serial: ar933x_uart: Fix build failure with disabled console

2019-05-04T07:20:13+00:00

[ Upstream commit 72ff51d8dd262d1fef25baedc2ac35116435be47 ]

Andrey has reported on OpenWrt's bug tracking system[1], that he
currently can't use ar93xx_uart as pure serial UART without console
(CONFIG_SERIAL_8250_CONSOLE and CONFIG_SERIAL_AR933X_CONSOLE undefined),
because compilation ends with following error:

 ar933x_uart.c: In function 'ar933x_uart_console_write':
 ar933x_uart.c:550:14: error: 'struct uart_port' has no
                               member named 'sysrq'

So this patch moves all the code related to console handling behind
series of CONFIG_SERIAL_AR933X_CONSOLE ifdefs.

1. https://bugs.openwrt.org/index.php?do=details&task_id=2152

Cc: Greg Kroah-Hartman 
Cc: Jiri Slaby 
Cc: Andrey Batyiev 
Reported-by: Andrey Batyiev 
Tested-by: Andrey Batyiev 
Signed-off-by: Petr Štetiar 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Sasha Levin (Microsoft)

sc16is7xx: missing unregister/delete driver on error in sc16is7xx_init()

2019-05-04T07:20:13+00:00

[ Upstream commit ac0cdb3d990108df795b676cd0d0e65ac34b2273 ]

Add the missing uart_unregister_driver() and i2c_del_driver() before return
from sc16is7xx_init() in the error handling case.

Signed-off-by: Mao Wenan 
Reviewed-by: Vladimir Zapolskiy 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Sasha Levin (Microsoft)

serial: sh-sci: Fix HSCIF RX sampling point calculation

2019-04-27T07:36:36+00:00

commit ace965696da2611af759f0284e26342b7b6cec89 upstream.

There are several issues with the formula used for calculating the
deviation from the intended rate:
  1. While min_err and last_stop are signed, srr and baud are unsigned.
     Hence the signed values are promoted to unsigned, which will lead
     to a bogus value of deviation if min_err is negative,
  2. Srr is the register field value, which is one less than the actual
     sampling rate factor,
  3. The divisions do not use rounding.

Fix this by casting unsigned variables to int, adding one to srr, and
using a single DIV_ROUND_CLOSEST().

Fixes: 63ba1e00f178a448 ("serial: sh-sci: Support for HSCIF RX sampling point adjustment")
Signed-off-by: Geert Uytterhoeven 
Reviewed-by: Mukesh Ojha 
Cc: stable 
Reviewed-by: Ulrich Hecht 
Signed-off-by: Greg Kroah-Hartman

serial: sh-sci: Fix HSCIF RX sampling point adjustment

2019-04-27T07:36:36+00:00

commit 6b87784b53592a90d21576be8eff688b56d93cce upstream.

The calculation of the sampling point has min() and max() exchanged.
Fix this by using the clamp() helper instead.

Fixes: 63ba1e00f178a448 ("serial: sh-sci: Support for HSCIF RX sampling point adjustment")
Signed-off-by: Geert Uytterhoeven 
Reviewed-by: Ulrich Hecht 
Reviewed-by: Wolfram Sang 
Acked-by: Dirk Behme 
Cc: stable 
Reviewed-by: Simon Horman 
Signed-off-by: Greg Kroah-Hartman

serial: uartps: console_setup() can't be placed to init section

2019-04-20T07:16:01+00:00

[ Upstream commit 4bb1ce2350a598502b23088b169e16b43d4bc639 ]

When console device is rebinded, console_setup() is called again.
But marking it as __init means that function will be clear after boot is
complete. If console device is binded again console_setup() is not found
and error "Unable to handle kernel paging request at virtual address"
is reported.

Signed-off-by: Michal Simek 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Sasha Levin