linux.git/drivers/tty/serial, branch v4.10-rc2

Replace with globally

2016-12-24T19:46:01+00:00

This was entirely automated, using the script by Al:

  PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*'
  sed -i -e "s!$PATT!#include !" \
        $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h)

to do the replacement at the end of the merge window.

Requested-by: Al Viro 
Signed-off-by: Linus Torvalds

Merge tag 'dmaengine-4.10-rc1' of git://git.infradead.org/users/vkoul/slave-dma

2016-12-15T04:42:45+00:00

Pull dmaengine updates from Vinod Koul:
 "Fairly routine update this time around with all changes specific to
  drivers:

   - New driver for STMicroelectronics FDMA
   - Memory-to-memory transfers on dw dmac
   - Support for slave maps on pl08x devices
   - Bunch of driver fixes to use dma_pool_zalloc
   - Bunch of compile and warning fixes spread across drivers"

[ The ST FDMA driver already came in earlier through the remoteproc tree ]

* tag 'dmaengine-4.10-rc1' of git://git.infradead.org/users/vkoul/slave-dma: (68 commits)
  dmaengine: sirf-dma: remove unused ‘sdesc’
  dmaengine: pl330: remove unused ‘regs’
  dmaengine: s3c24xx: remove unused ‘cdata’
  dmaengine: stm32-dma: remove unused ‘src_addr’
  dmaengine: stm32-dma: remove unused ‘dst_addr’
  dmaengine: stm32-dma: remove unused ‘sfcr’
  dmaengine: pch_dma: remove unused ‘cookie’
  dmaengine: mic_x100_dma: remove unused ‘data’
  dmaengine: img-mdc: remove unused ‘prev_phys’
  dmaengine: usb-dmac: remove unused ‘uchan’
  dmaengine: ioat: remove unused ‘res’
  dmaengine: ioat: remove unused ‘ioat_dma’
  dmaengine: ioat: remove unused ‘is_raid_device’
  dmaengine: pl330: do not generate unaligned access
  dmaengine: k3dma: move to dma_pool_zalloc
  dmaengine: at_hdmac: move to dma_pool_zalloc
  dmaengine: at_xdmac: don't restore unsaved status
  dmaengine: ioat: set error code on failures
  dmaengine: ioat: set error code on failures
  dmaengine: DW DMAC: add multi-block property to device tree
  ...

serial: 8250_mid fix calltrace when hotplug 8250 serial controller

2016-11-30T12:06:08+00:00

Fix the following Calltrace:
[   77.768221] WARNING: CPU: 5 PID: 645 at drivers/dma/dmaengine.c:1069 dma_async_device_unregister+0xe2/0xf0
[   77.775058] dma_async_device_unregister called while 1 clients hold a reference
[   77.825048] CPU: 5 PID: 645 Comm: sh Not tainted 4.8.8-WR9.0.0.0_standard+ #3
[   77.832550] Hardware name: Intel Corp. Aspen Cove/Server, BIOS HAVLCRB1.X64.0012.D58.1604140405 04/14/2016
[   77.840396]  0000000000000000 ffffc90008adbc80 ffffffff81403456 ffffc90008adbcd0
[   77.848245]  0000000000000000 ffffc90008adbcc0 ffffffff8105e2e1 0000042d08adbf20
[   77.855934]  ffff88046a861c18 ffff88046a85c420 ffffffff820d4200 ffff88046ae92318
[   77.863601] Call Trace:
[   77.871113]  [] dump_stack+0x4f/0x69
[   77.878655]  [] __warn+0xd1/0xf0
[   77.886102]  [] warn_slowpath_fmt+0x4f/0x60
[   77.893508]  [] ? find_next_bit+0x19/0x20
[   77.900730]  [] ? dma_channel_rebalance+0x23e/0x270
[   77.907814]  [] dma_async_device_unregister+0xe2/0xf0
[   77.914992]  [] hsu_dma_remove+0x1a/0x60
[   77.921977]  [] dnv_exit+0x1c/0x20
[   77.928752]  [] mid8250_remove+0x26/0x40
[   77.935607]  [] pci_device_remove+0x39/0xc0
[   77.942292]  [] __device_release_driver+0x9a/0x140
[   77.948836]  [] device_release_driver+0x23/0x30
[   77.955364]  [] pci_stop_bus_device+0x8c/0xa0
[   77.961769]  [] pci_stop_and_remove_bus_device_locked+0x1a/0x30
[   77.968113]  [] remove_store+0x5e/0x70
[   77.974267]  [] dev_attr_store+0x18/0x30
[   77.980243]  [] sysfs_kf_write+0x3a/0x50
[   77.986180]  [] kernfs_fop_write+0x10b/0x190
[   77.992118]  [] __vfs_write+0x18/0x40
[   77.998032]  [] vfs_write+0xae/0x190
[   78.003747]  [] SyS_write+0x46/0xb0
[   78.009234]  [] entry_SYSCALL_64_fastpath+0x13/0x8f
[   78.014809] ---[ end trace 0c36dd73b7408eb2 ]---

This happens when the 8250 serial controller is hotplugged as follows:
echo 1 > /sys/bus/pci/devices/0000:00:1a.0/remove

This trace happens due to the serial port still holding a reference when
the dma device is unregistered.
The dma unregister routine will check if there is still a reference exist,
if so it will give the WARNING(here serial port still was not unregister).

To fix this, We need to unregister the serial port first, then do DMA
device unregister to make sure there is no reference when to DMA routine.

Signed-off-by: Liwei Song 
Signed-off-by: Greg Kroah-Hartman

dmaengine: DW DMAC: add multi-block property to device tree

2016-11-30T03:27:50+00:00

Several versions of DW DMAC have multi block transfers hardware
support. Hardware support of multi block transfers is disabled
by default if we use DT to configure DMAC and software emulation
of multi block transfers used instead.
Add multi-block property, so it is possible to enable hardware
multi block transfers (if present) via DT.

Switch from per device is_nollp variable to multi_block array
to be able enable/disable multi block transfers separately per
channel.

Acked-by: Andy Shevchenko 
Signed-off-by: Eugeniy Paltsev 
Signed-off-by: Vinod Koul

serial: 8250_pci: Detach low-level driver during PCI error recovery

2016-11-29T19:20:07+00:00

During a PCI error recovery, like the ones provoked by EEH in the ppc64
platform, all IO to the device must be blocked while the recovery is
completed.  Current 8250_pci implementation only suspends the port
instead of detaching it, which doesn't prevent incoming accesses like
TIOCMGET and TIOCMSET calls from reaching the device.  Those end up
racing with the EEH recovery, crashing it.  Similar races were also
observed when opening the device and when shutting it down during
recovery.

This patch implements a more robust IO blockage for the 8250_pci
recovery by unregistering the port at the beginning of the procedure and
re-adding it afterwards.  Since the port is detached from the uart
layer, we can be sure that no request will make through to the device
during recovery.  This is similar to the solution used by the JSM serial
driver.

I thank Peter Hurley  for valuable input on
this one over one year ago.

Signed-off-by: Gabriel Krisman Bertazi 
Signed-off-by: Greg Kroah-Hartman

serial: core: don't check port twice in a row

2016-11-28T07:29:34+00:00

There is no need to check port for NULL in uart_port_deref() since we call it
only when port is defined.

There are few places that violate this. Fix them here as well.

Signed-off-by: Andy Shevchenko 
Signed-off-by: Greg Kroah-Hartman

mxs-auart: count FIFO overrun errors

2016-11-16T16:17:42+00:00

The mxs-auart driver does not count FIFO overrun errors. These errors never
appear in /proc/tty/driver/ttyAPP. This is because the OERR status bit is
masked by read_status_mask in the rx interrupt function, but the
AUART_STAT_OERR bit is never set in read_status_mask. The patch enables the
counting of overrun errors.

Signed-off-by: Wolfgang Ocker 
Reviewed-by: Fabio Estevam 
Signed-off-by: Greg Kroah-Hartman

serial: 8250_dw: Add support for IrDA SIR mode

2016-11-16T09:59:38+00:00

Add a set_ldisc function to enable/disable IrDA SIR mode according to
the new line discipline, if IrDA SIR mode is supported by the hardware
configuration.

Signed-off-by: Ed Blake 
Signed-off-by: Greg Kroah-Hartman

serial: 8250: Expose set_ldisc function

2016-11-16T09:59:38+00:00

Expose set_ldisc() function so that it can be overridden with a
platform specific implementation.

Signed-off-by: Ed Blake 
Signed-off-by: Greg Kroah-Hartman

serial: 8250: Add IrDA to UART capabilities

2016-11-16T09:59:38+00:00

Add an IrDA UART capability flag and change the type of
uart_8250_port.capabilities to be u32 rather than unsigned short to
accommodate the additional flag.

Signed-off-by: Ed Blake 
Signed-off-by: Greg Kroah-Hartman