kernel/linux.git/drivers/tty/serial/sunhv.c, branch linux-4.4.y

sunhv: Fix device naming inconsistency between sunhv_console and sunhv_reg

2019-06-22T06:18:25+00:00

[ Upstream commit 07a6d63eb1b54b5fb38092780fe618dfe1d96e23 ] In d5a2aa24, the name in struct console sunhv_console was changed from "ttyS" to "ttyHV" while the name in struct uart_ops sunhv_pops remained unchanged. This results in the hypervisor console device to be listed as "ttyHV0" under /proc/consoles while the device node is still named "ttyS0": root@osaka:~# cat /proc/consoles ttyHV0 -W- (EC p ) 4:64 tty0 -WU (E ) 4:1 root@osaka:~# readlink /sys/dev/char/4:64 ../../devices/root/f02836f0/f0285690/tty/ttyS0 root@osaka:~# This means that any userland code which tries to determine the name of the device file of the hypervisor console device can not rely on the information provided by /proc/consoles. In particular, booting current versions of debian- installer inside a SPARC LDOM will fail with the installer unable to determine the console device. After renaming the device in struct uart_ops sunhv_pops to "ttyHV" as well, the inconsistency is fixed and it is possible again to determine the name of the device file of the hypervisor console device by reading the contents of /proc/console: root@osaka:~# cat /proc/consoles ttyHV0 -W- (EC p ) 4:64 tty0 -WU (E ) 4:1 root@osaka:~# readlink /sys/dev/char/4:64 ../../devices/root/f02836f0/f0285690/tty/ttyHV0 root@osaka:~# With this change, debian-installer works correctly when installing inside a SPARC LDOM. Signed-off-by: John Paul Adrian Glaubitz Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman

sparc64: Migrate hvcons irq to panicked cpu

2017-10-21T15:09:05+00:00

[ Upstream commit 7dd4fcf5b70694dc961eb6b954673e4fc9730dbd ] On panic, all other CPUs are stopped except the one which had hit panic. To keep console alive, we need to migrate hvcons irq to panicked CPU. Signed-off-by: Vijay Kumar Signed-off-by: David S. Miller Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

sparc: serial: sunhv: fix a double lock bug

2016-11-21T09:06:40+00:00

[ Upstream commit 344e3c7734d5090b148c19ac6539b8947fed6767 ] We accidentally take the "port->lock" twice in a row. This old code was supposed to be deleted. Fixes: e58e241c1788 ('sparc: serial: Clean up the locking for -rt') Signed-off-by: Dan Carpenter Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman

tty/serial: Skip 'NULL' char after console break when sysrq enabled

2015-12-24T17:13:37+00:00

When sysrq is triggered from console, serial driver for SUN hypervisor console receives a console break and enables the sysrq. It expects a valid sysrq char following with break. Meanwhile if driver receives 'NULL' ASCII char then it disables sysrq and sysrq handler will never be invoked. This fix skips calling uart sysrq handler when 'NULL' is received while sysrq is enabled. Signed-off-by: Vijay Kumar Acked-by: Karl Volz Signed-off-by: David S. Miller

tty: serial: constify sunhv_ops structs

2015-12-24T17:04:18+00:00

Constifies sunhv_ops structures in tty's serial driver since they are not modified after their initialization. Detected and found using Coccinelle. Suggested-by: Julia Lawall Signed-off-by: Aya Mahfouz Signed-off-by: David S. Miller

drivers/tty: make serial/sunhv.c driver explicitly non-modular

2015-07-24T01:27:41+00:00

The Kconfig for this driver is currently: config SERIAL_SUNHV bool "Sun4v Hypervisor Console support" ...meaning that it currently is not being built as a module by anyone. Lets remove the modular and unused code here, so that when reading the driver there is no doubt it is builtin-only. Since module_init translates to device_initcall in the non-modular case, the init ordering remains unchanged with this commit. We don't swap module.h for init.h since this file has init.h already. We leave some tags like MODULE_LICENSE for documentation purposes, and for the "git blame" value. Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code, so we remove that too. Cc: "David S. Miller" Cc: Greg Kroah-Hartman Cc: Jiri Slaby Cc: sparclinux@vger.kernel.org Cc: linux-serial@vger.kernel.org Signed-off-by: Paul Gortmaker Signed-off-by: Greg Kroah-Hartman

tty: serial: drop owner assignment from platform_drivers

2014-10-20T14:21:45+00:00

A platform_driver does not need to set an owner, it will be populated by the driver core. Signed-off-by: Wolfram Sang

serial: Fix send_xchar() handlers

2014-09-08T23:22:42+00:00

START_CHAR() & STOP_CHAR() can be disabled if set to '\0' (__DISABLED_CHAR). UART drivers which define a send_xchar() handler must not transmit __DISABLED_CHAR. Document requirement. Affected drivers: sunsab sunhv cc: David S. Miller cc: Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman

serial: treewide: Remove empty implementations of enable_ms()

2014-07-10T00:29:38+00:00

Signed-off-by: Alexander Shiyan Signed-off-by: Greg Kroah-Hartman

sparc: serial: Clean up the locking for -rt

2014-03-06T21:32:25+00:00

Signed-off-by: David S. Miller Tested-by: Allen Pais