Marek Vasut f6aa5beb45 serial: 8250: Fix clearing FIFOs in RS485 mode again ... The 8250 FIFOs indeed need to be cleared after stopping transmission in RS485 mode without SER_RS485_RX_DURING_TX flag set. But there are two problems with the approach taken by the previous patch from Fixes tag. First, serial8250_clear_fifos() should clear fifos, but what it really does is it enables the FIFOs unconditionally if present, clears them and then sets the FCR register to zero, which effectively disables the FIFOs. In case the FIFO is disabled, enabling it and clearing it makes no sense and in fact can trigger misbehavior of the 8250 core. Moreover, the FCR register may contain other FIFO configuration bits which may not be writable unconditionally and writing them incorrectly can trigger misbehavior of the 8250 core too. (ie. AM335x UART swallows the first byte and retransmits the last byte twice because of this FCR write). Second, serial8250_clear_and_reinit_fifos() completely reloads the FCR, but what really has to happen at the end of the RS485 transmission is clearing of the FIFOs and nothing else. This patch repairs serial8250_clear_fifos() so that it really only clears the FIFOs by operating on FCR[2:1] bits and leaves all the other bits alone. It also undoes serial8250_clear_and_reinit_fifos() from __do_stop_tx_rs485() as serial8250_clear_fifos() is sufficient. Signed-off-by: Marek Vasut <marex@denx.de> Fixes: 2bed8a8e70 ("Clearing FIFOs in RS485 emulation mode causes subsequent transmits to break") Cc: Daniel Jedrychowski <avistel@gmail.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: stable <stable@vger.kernel.org> # let it bake a bit before merging Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-09-18 16:07:25 +02:00
..
accessibility
acpi	Merge branch 'acpi-bus'	2018-09-07 10:05:20 +02:00
amba
android	android: binder: fix the race mmap and alloc_new_buf_locked	2018-09-12 09:18:29 +02:00
ata	SCSI fixes on 20180905	2018-09-05 09:17:20 -07:00
atm
auxdisplay	Char/Misc driver patches for 4.19-rc1	2018-08-18 11:04:51 -07:00
base	firmware: Fix security issue with request_firmware_into_buf()	2018-09-12 09:31:00 +02:00
bcma
block	for-linus-20180913	2018-09-13 19:16:11 -10:00
bluetooth	Bluetooth: mediatek: Fix memory leak	2018-08-21 16:56:20 +02:00
bus	Merge branch 'perm-fix' into omap-for-v4.19/fixes-v2	2018-08-28 09:58:03 -07:00
cdrom	cdrom: Fix info leak/OOB read in cdrom_ioctl_drive_status	2018-08-29 08:09:20 -06:00
char	A few fixes that came around or after the merge window, except	2018-09-12 19:33:56 -10:00
clk	clk: x86: Set default parent to 48Mhz	2018-08-30 14:47:41 -07:00
clocksource	RISC-V Updates for the 4.19 Merge Window	2018-08-19 09:56:38 -07:00
connector
cpufreq	ARM: SoC driver updates	2018-08-23 13:52:46 -07:00
cpuidle	cpuidle: menu: Retain tick when shallow state is selected	2018-08-25 13:16:08 +02:00
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2018-08-29 13:38:39 -07:00
dax	drivers/dax/device.c: convert variable to vm_fault_t type	2018-09-04 16:45:02 -07:00
dca
devfreq	Char/Misc driver patches for 4.19-rc1	2018-08-18 11:04:51 -07:00
dio
dma	dmaengine: mic_x100_dma: use devm_kzalloc to fix an issue	2018-08-27 11:16:04 +05:30
dma-buf
edac	EDAC: Add missing MEM_LRDDR4 entry in edac_mem_types[]	2018-08-17 15:13:34 +02:00
eisa
extcon
firewire	firewire: use 64-bit time_t based interfaces	2018-08-17 16:20:27 -07:00
firmware	firmware: arm_scmi: fix divide by zero when sustained_perf_level is zero	2018-09-06 09:59:40 -07:00
fmc
fpga	fpga: dfl: fme: fix return value check in in pr_mgmt_init()	2018-09-12 09:31:00 +02:00
fsi
gnss
gpio	gpio: Fix crash due to registration race	2018-08-31 11:30:45 +02:00
gpu	Merge branch 'linux-4.19' of git://github.com/skeggsb/linux into drm-fixes	2018-09-14 09:38:42 +10:00
hid	HID: i2c-hid: Don't reset device upon system resume	2018-09-06 16:30:53 +02:00
hsi
hv	vmbus: don't return values for uninitalized channels	2018-09-12 09:31:00 +02:00
hwmon	ARM: SoC fixes	2018-09-08 15:38:57 -07:00
hwspinlock
hwtracing	drivers/hwtracing/intel_th/msu.c: change return type to vm_fault_t	2018-08-23 18:48:43 -07:00
i2c	i2c: xiic: Make the start and the byte count write atomic	2018-09-06 20:49:09 +02:00
ide	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide	2018-08-22 07:40:33 -07:00
idle
iio	First set of IIO fixes for the 4.19 cycle.	2018-09-09 09:33:29 +02:00
infiniband	pci-v4.19-fixes-1	2018-09-12 19:39:56 -10:00
input	ARM: 32-bit SoC platform updates	2018-08-23 13:44:43 -07:00
iommu	ARM: SoC: late updates	2018-08-25 14:12:36 -07:00
ipack
irqchip	irqchip/gic-v3-its: Cap lpi_id_bits to reduce memory footprint	2018-09-06 20:31:59 +02:00
isdn	isdn: Disable IIOCDBGVAR	2018-08-16 12:26:24 -07:00
leds
lightnvm
macintosh	macintosh: therm_windtunnel: drop using attach_adapter	2018-08-24 14:42:42 +02:00
mailbox
mcb
md	- DM verity fix for crash due to using vmalloc'd buffers with the	2018-09-13 19:12:55 -10:00
media	Merge branch 'ida-4.19' of git://git.infradead.org/users/willy/linux-dax	2018-08-26 11:48:42 -07:00
memory	memory: ti-aemif: fix a potential NULL-pointer dereference	2018-09-06 10:04:07 -07:00
memstick
message
mfd	mfd: at91-usart: Include Device Tree header	2018-09-11 11:44:56 +01:00
misc	misc: hmc6352: fix potential Spectre v1	2018-09-12 09:31:00 +02:00
mmc	mmc: meson-mx-sdio: fix OF child-node lookup	2018-09-05 08:28:45 +02:00
mtd	mtd: rawnand: denali: do not pass zero maxchips to nand_scan()	2018-08-27 20:41:46 +02:00
mux
net	nfp: flower: reject tunnel encap with ipv6 outer headers for offloading	2018-09-12 13:18:30 -07:00
nfc
ntb
nubus
nvdimm	libnvdimm-for-4.19_dax-memory-failure	2018-08-25 18:43:59 -07:00
nvme	nvmet-rdma: fix possible bogus dereference under heavy load	2018-09-05 12:18:01 -07:00
nvmem
of	Devicetree fixes for 4.19, part 2:	2018-09-14 13:03:17 -10:00
opp
oprofile
parisc
parport	Char/Misc driver patches for 4.19-rc1	2018-08-18 11:04:51 -07:00
pci	PCI: Fix enabling of PASID on RC integrated endpoints	2018-09-11 21:46:49 -05:00
pcmcia	pcmcia: remove long deprecated pcmcia_request_exclusive_irq() function	2018-08-18 12:30:42 -07:00
perf	Char/Misc driver patches for 4.19-rc1	2018-08-18 11:04:51 -07:00
phy
pinctrl	pinctrl: madera: Fix possible NULL pointer with pdata config	2018-08-29 14:02:47 +02:00
platform	platform-drivers-x86 for v4.19-1	2018-08-22 14:14:15 -07:00
pnp
power	treewide: convert ISO_8859-1 text comments to utf-8	2018-08-23 18:48:43 -07:00
powercap
pps
ps3
ptp	Char/Misc driver patches for 4.19-rc1	2018-08-18 11:04:51 -07:00
pwm	pwm: mediatek: Add MT7628 support	2018-08-20 11:36:07 +02:00
rapidio	drivers/rapidio/devices/rio_mport_cdev.c: remove redundant pointer md	2018-08-22 10:52:51 -07:00
ras
regulator	- New Drivers	2018-08-20 15:38:44 -07:00
remoteproc	remoteproc/davinci: use the reset framework	2018-08-16 17:39:55 -07:00
reset	ARM: SoC: late updates	2018-08-25 14:12:36 -07:00
rpmsg
rtc	RTC for 4.19	2018-08-20 16:30:27 -07:00
s390	s390 fixes for 4.19-rc4	2018-09-13 16:22:24 -10:00
sbus
scsi	scsi: qedi: Add the CRC size within iSCSI NVM image	2018-08-30 07:15:22 -04:00
sfi
sh
siox
slimbus
sn
soc	ARM: Device-tree updates	2018-08-23 14:02:22 -07:00
soundwire
spi	spi: at91-usart: Make local functions static	2018-09-11 11:43:07 +01:00
spmi
ssb
staging	staging: vboxvideo: Change address of scanout buffer on page-flip	2018-09-11 18:39:54 +02:00
target	scsi: iscsi: target: Fix conn_ops double free	2018-08-30 07:07:12 -04:00
tc
tee	ARM: SoC driver updates	2018-08-23 13:52:46 -07:00
thermal	Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal	2018-08-28 16:11:34 -07:00
thunderbolt
tty	serial: 8250: Fix clearing FIFOs in RS485 mode again	2018-09-18 16:07:25 +02:00
uio	Char/Misc fix for 4.19-rc1	2018-08-19 09:30:44 -07:00
usb	Revert "cdc-acm: implement put_char() and flush_chars()"	2018-09-10 20:40:29 +02:00
uwb
vfio	powerpc updates for 4.19	2018-08-17 11:32:50 -07:00
vhost	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2018-08-27 11:59:39 -07:00
video	fbdev changes for v4.19:	2018-08-23 15:44:58 -07:00
virt
virtio	virtio, vhost: fixes, tweaks	2018-08-24 08:45:19 -07:00
visorbus
vlynq
vme
w1	power supply and reset changes for the v4.19 series	2018-08-21 18:06:27 -07:00
watchdog	include/linux/compiler*.h: make compiler-*.h mutually exclusive	2018-08-22 17:31:34 -07:00
xen	xen/gntdev: fix up blockable calls to mn_invl_range_start	2018-09-14 08:52:30 -04:00
zorro
Kconfig
Makefile	Char/Misc driver patches for 4.19-rc1	2018-08-18 11:04:51 -07:00