linux-stable.git/drivers/tty, branch v3.18.17

serial: 8250_dw: add support for AMD SOC Carrizo

2015-06-28T17:39:20+00:00

[ Upstream commit 5ef86b74209db33c133b5f18738dd8f3189b63a1 ]

Add ACPI identifier for UART on AMD SOC Carrizo.

Signed-off-by: Ken Xue 
Cc: stable 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Sasha Levin

serial: 8250: add support for ACPI-probed serial port for X-Gene platform

2015-06-28T17:39:20+00:00

[ Upstream commit 5e1aeea52f6a0763e79473b1767401fda88eb7e1 ]

Enable APM X-Gene SoC serial port functionality when using ACPI table to
initialize serial port.

Signed-off-by: Feng Kan 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Sasha Levin

serial: imx: Fix clearing of receiver overrun flag

2015-06-28T17:39:15+00:00

[ Upstream commit 91555ce9012557b2d621d7b0b6ec694218a2a9bc ]

The writeable bits in the USR2 register are all "write 1 to
clear" so only write the bits that actually should be cleared.

Fixes: f1f836e4209e ("serial: imx: Add Rx Fifo overrun error message")
Signed-off-by: Uwe Kleine-König 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Sasha Levin

serial: imx: Enable UCR4_OREN in startup interface

2015-06-28T17:39:15+00:00

[ Upstream commit 6f026d6b7cb6e019b6352ed7fb71497c787fd6d7 ]

Other than enable Receiver Overrun Interrupt Enable (UCR4_OREN)
in start_tx interface, UCR4_OREN should be enabled before enable
of Receiver.

Signed-off-by: Jiada Wang 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Sasha Levin

tty/n_gsm.c: fix a memory leak when gsmtty is removed

2015-06-10T17:42:22+00:00

[ Upstream commit 8f9cfeed3eae86c70d3b04445a6f2036b27b6304 ]

when gsmtty_remove put dlci, it will cause memory leak if dlci->port's refcount is zero.
So we do the cleanup work in .cleanup callback instead.

dlci will be last put in two call chains.
1) gsmld_close -> gsm_cleanup_mux -> gsm_dlci_release -> dlci_put
2) gsmld_remove -> dlci_put
so there is a race. the memory leak depends on the race.

In call chain 2. we hit the memory leak. below comment tells.

release_tty -> tty_driver_remove_tty -> gsmtty_remove -> dlci_put -> tty_port_destructor (WARN_ON(port->itty) and return directly)
                         |
                tty->port->itty = NULL;
                         |
                tty_kref_put ---> release_one_tty -> gsmtty_cleanup (added by our patch)

So our patch fix the memory leak by doing the cleanup work after tty core did.

Signed-off-by: Pan Xinhui 
Fixes: dfabf7ffa30585
Cc: stable  # 3.14+
Acked-by: Jiri Slaby 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Sasha Levin

xen/events: don't bind non-percpu VIRQs with percpu chip

2015-06-09T17:43:54+00:00

[ Upstream commit 77bb3dfdc0d554befad58fdefbc41be5bc3ed38a ]

A non-percpu VIRQ (e.g., VIRQ_CONSOLE) may be freed on a different
VCPU than it is bound to.  This can result in a race between
handle_percpu_irq() and removing the action in __free_irq() because
handle_percpu_irq() does not take desc->lock.  The interrupt handler
sees a NULL action and oopses.

Only use the percpu chip/handler for per-CPU VIRQs (like VIRQ_TIMER).

  # cat /proc/interrupts | grep virq
   40:      87246          0  xen-percpu-virq      timer0
   44:          0          0  xen-percpu-virq      debug0
   47:          0      20995  xen-percpu-virq      timer1
   51:          0          0  xen-percpu-virq      debug1
   69:          0          0   xen-dyn-virq      xen-pcpu
   74:          0          0   xen-dyn-virq      mce
   75:         29          0   xen-dyn-virq      hvc_console

Signed-off-by: David Vrabel 
Cc: 
Signed-off-by: Sasha Levin

xen/console: Update console event channel on resume

2015-05-23T19:53:06+00:00

[ Upstream commit b9d934f27c91b878c4b2e64299d6e419a4022f8d ]

After a resume the hypervisor/tools may change console event
channel number. We should re-query it.

Signed-off-by: Boris Ostrovsky 
Cc: 
Signed-off-by: David Vrabel 
Signed-off-by: Sasha Levin

tty/serial: at91: maxburst was missing for dma transfers

2015-05-17T23:12:40+00:00

[ Upstream commit a8d4e01637902311c5643b69a5c80e2805f04054 ]

Maxburst was not set when doing the dma slave configuration. This value
is checked by the recently introduced xdmac. It causes an error when
doing the slave configuration and so prevents from using dma.

Signed-off-by: Ludovic Desroches 
Cc:  # 3.12 and later
Acked-by: Nicolas Ferre 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Sasha Levin

serial: xilinx: Use platform_get_irq to get irq description structure

2015-05-17T23:12:38+00:00

[ Upstream commit 5c90c07b98c02198d9777a7c4f3047b0a94bf7ed ]

For systems with CONFIG_SERIAL_OF_PLATFORM=y and device_type =
"serial"; property in DT of_serial.c driver maps and unmaps IRQ (because
driver probe fails). Then a driver is called but irq mapping is not
created that's why driver is failing again in again on request_irq().
Based on this use platform_get_irq() instead of platform_get_resource()
which is doing irq_desc allocation and driver itself can request IRQ.

Fix both xilinx serial drivers in the tree.

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

serial: of-serial: Remove device_type = "serial" registration

2015-05-17T23:12:37+00:00

[ Upstream commit 6befa9d883385c580369a2cc9e53fbf329771f6d ]

Do not probe all serial drivers by of_serial.c which are using
device_type = "serial"; property. Only drivers which have valid
compatible strings listed in the driver should be probed.

When PORT_UNKNOWN is setup probe will fail anyway.

Arnd quotation about driver historical background:
"when I wrote that driver initially, the idea was that it would
get used as a stub to hook up all other serial drivers but after
that, the common code learned to create platform devices from DT"

This patch fix the problem with on the system with xilinx_uartps and
16550a where of_serial failed to register for xilinx_uartps and because
of irq_dispose_mapping() removed irq_desc. Then when xilinx_uartps was asking
for irq with request_irq() EINVAL is returned.

Signed-off-by: Michal Simek 
CC: 
Acked-by: Arnd Bergmann 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Sasha Levin