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Hugo Villeneuve 4739a8a989 serial: sc16is7xx: fix unconditional activation of THRI interrupt 
[ Upstream commit 9915753037 ]

Commit cc4c1d05eb ("sc16is7xx: Properly resume TX after stop") changed
behavior to unconditionnaly set the THRI interrupt in sc16is7xx_tx_proc().

For example when sending a 65 bytes message, and assuming the Tx FIFO is
initially empty, sc16is7xx_handle_tx() will write the first 64 bytes of the
message to the FIFO and sc16is7xx_tx_proc() will then activate THRI. When
the THRI IRQ is fired, the driver will write the remaining byte of the
message to the FIFO, and disable THRI by calling sc16is7xx_stop_tx().

When sending a 2 bytes message, sc16is7xx_handle_tx() will write the 2
bytes of the message to the FIFO and call sc16is7xx_stop_tx(), disabling
THRI. After sc16is7xx_handle_tx() exits, control returns to
sc16is7xx_tx_proc() which will unconditionally set THRI. When the THRI IRQ
is fired, the driver simply acknowledges the interrupt and does nothing
more, since all the data has already been written to the FIFO. This results
in 2 register writes and 4 register reads all for nothing and taking
precious cycles from the I2C/SPI bus.

Fix this by enabling the THRI interrupt only when we fill the Tx FIFO to
its maximum capacity and there are remaining bytes to send in the message.

Fixes: cc4c1d05eb ("sc16is7xx: Properly resume TX after stop")
Cc:  <stable@vger.kernel.org>
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Link: https://lore.kernel.org/r/20231211171353.2901416-7-hugo@hugovil.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-01-31 16:19:10 -08:00
..
accel accel/habanalabs: fix information leak in sec_attest_info() 2024-01-25 15:35:38 -08:00
accessibility tty: use u8 for flags 2023-08-11 21:12:45 +02:00
acpi acpi: property: Let args be NULL in __acpi_node_get_property_reference 2024-01-25 15:35:51 -08:00
amba amba: bus: fix refcount leak 2023-08-22 15:50:57 +02:00
android binder: fix race between mmput() and do_exit() 2024-01-25 15:35:42 -08:00
ata scsi: sd: Fix system start for ATA devices 2023-12-08 08:52:17 +01:00
atm atm: solos-pci: Fix potential deadlock on &tx_queue_lock 2023-12-20 17:01:46 +01:00
auxdisplay drm for 6.6-rc1 2023-08-30 13:34:34 -07:00
base rtc: Extend timeout for waiting for UIP to clear to 1s 2024-01-31 16:18:56 -08:00
bcma bcma: Add explicit of_device.h include 2023-04-14 15:32:56 +03:00
block rbd: don't move requests to the running list on errors 2024-01-31 16:19:06 -08:00
bluetooth Bluetooth: btmtkuart: fix recv_buf() return value 2024-01-25 15:35:29 -08:00
bus bus: mhi: host: Add spinlock to protect WP access when queueing TREs 2024-01-31 16:18:52 -08:00
cache riscv: RISCV_NONSTANDARD_CACHE_OPS shouldn't depend on RISCV_DMA_NONCOHERENT 2023-10-26 09:42:37 +02:00
cdrom cdrom/gdrom: Fix build error 2023-06-29 08:09:31 -06:00
cdx cdx: Explicitly include correct DT includes 2023-08-04 16:21:20 +02:00
char hwrng: core - Fix page fault dead lock on mmap-ed hwrng 2024-01-31 16:18:50 -08:00
clk clk: qcom: dispcc-sm8550: Update disp PLL settings 2024-01-25 15:35:38 -08:00
clocksource clocksource/drivers/timer-ti-dm: Fix make W=n kerneldoc warnings 2024-01-25 15:35:42 -08:00
comedi Revert "comedi: add HAS_IOPORT dependencies" 2023-09-12 15:49:20 +02:00
connector connector: Fix proc_event_num_listeners count not cleared 2024-01-20 11:51:47 +01:00
counter First set of Counter fixes for 6.6 2023-10-02 13:13:15 +02:00
cpufreq cpufreq: intel_pstate: Refine computation of P-state for given frequency 2024-01-31 16:19:07 -08:00
cpuidle cpuidle: haltpoll: Do not enable interrupts when entering idle 2024-01-25 15:35:15 -08:00
crypto crypto: sahara - do not resize req->src when doing hash operations 2024-01-25 15:35:18 -08:00
cxl cxl/port: Fix missing target list lock 2024-01-25 15:35:55 -08:00
dax mm: remove enum page_entry_size 2023-08-24 16:20:30 -07:00
dca Mainly singleton patches all over the place. Series of note are: 2023-04-27 19:57:00 -07:00
devfreq PM / devfreq: Fix buffer overflow in trans_stat_show 2024-01-31 16:18:50 -08:00
dio drivers: dio: fix possible memory leak in dio_init() 2022-11-09 15:12:37 +01:00
dma dmaengine: idxd: Move dma_free_coherent() out of spinlocked context 2024-01-31 16:18:47 -08:00
dma-buf dma-buf: fix check in dma_resv_add_fence 2023-12-08 08:52:19 +01:00
edac EDAC/thunderx: Fix possible out-of-bounds string access 2024-01-25 15:35:12 -08:00
eisa EISA: Replace all non-returning strlcpy with strscpy 2023-07-27 10:04:42 -07:00
extcon extcon: cht_wc: add POWER_SUPPLY dependency 2023-08-05 15:42:15 +09:00
firewire firewire: ohci: suppress unexpected system reboot in AMD Ryzen machines and ASM108x/VT630x PCIe cards 2024-01-10 17:17:00 +01:00
firmware Revert "drivers/firmware: Move sysfb_init() from device_initcall to subsys_initcall_sync" 2024-01-31 16:19:07 -08:00
fpga fpga: Fix memory leak for fpga_region_test_class_find() 2023-10-24 19:32:39 +02:00
fsi fsi: i2cr: Switch to use struct i2c_driver's .probe() 2023-08-22 15:51:33 +02:00
gnss driver core: class: remove module * from class_create() 2023-03-17 15:16:33 +01:00
gpio gpiolib: acpi: Ignore touchpad wakeup on GPD G1619-04 2024-01-31 16:19:07 -08:00
gpu drm/amd/display: Fix uninitialized variable usage in core_link_ 'read_dpcd() & write_dpcd()' functions 2024-01-31 16:19:09 -08:00
greybus greybus: Use alloc_ordered_workqueue() to create ordered workqueues 2023-05-08 13:52:27 -10:00
hid HID: wacom: Correct behavior when processing some confidence == false touches 2024-01-25 15:35:48 -08:00
hsi hsi: omap_ssi: Explicitly include correct DT includes 2023-07-31 23:17:57 +02:00
hte hte: tegra: Fix missing error code in tegra_hte_test_probe() 2023-11-20 11:59:08 +01:00
hv hyperv-next for v6.6 2023-09-04 11:26:29 -07:00
hwmon hwmon: (corsair-psu) Fix probe when built-in 2024-01-20 11:51:42 +01:00
hwspinlock hwspinlock: qcom: add missing regmap config for SFPB MMIO implementation 2023-07-17 11:49:18 -07:00
hwtracing coresight: etm4x: Fix width of CCITMIN field 2024-01-20 11:51:49 +01:00
i2c i2c: s3c24xx: fix transferring more than one message in polling mode 2024-01-25 15:36:01 -08:00
i3c i3c: master: svc: fix random hot join failure since timeout error 2023-11-28 17:20:06 +00:00
idle x86: Fix CPUIDLE_FLAG_IRQ_ENABLE leaking timer reprogram 2024-01-25 15:35:12 -08:00
iio iio: adc: ad7091r: Enable internal vref if external vref is not supplied 2024-01-31 16:18:47 -08:00
infiniband IB/iser: Prevent invalidating wrong MR 2024-01-25 15:35:40 -08:00
input Input: atkbd - use ab83 as id when skipping the getid command 2024-01-25 15:35:41 -08:00
interconnect interconnect: qcom: sm8250: Enable sync_state 2024-01-01 12:42:36 +00:00
iommu iommu: Don't reserve 0-length IOVA region 2024-01-25 15:35:54 -08:00
ipack tty: make tty_operations::write()'s count size_t 2023-08-11 21:12:46 +02:00
irqchip irqchip/gic-v3-its: Flush ITS tables correctly in non-coherent GIC designs 2023-12-03 07:33:02 +01:00
isdn isdn: mISDN: hfcsusb: Spelling fix in comment 2023-10-23 09:39:46 +01:00
leds leds: aw200xx: Fix write to DIM parameter 2024-01-25 15:35:49 -08:00
macintosh powerpc updates for 6.6 2023-08-31 12:43:10 -07:00
mailbox mailbox: qcom-ipcc: fix incorrect num_chans counting 2023-09-05 10:11:01 -05:00
mcb mcb: fix error handling for different scenarios when parsing 2023-11-28 17:20:05 +00:00
md Revert "Revert "md/raid5: Wait for MD_SB_CHANGE_PENDING in raid5d"" 2024-01-25 15:36:01 -08:00
media media: i2c: imx290: Properly encode registers as little-endian 2024-01-31 16:19:10 -08:00
memory memory: tegra: Set BPMP msg flags to reset IPC channels 2023-11-20 11:59:17 +01:00
memstick memstick r592: make memstick_debug_get_tpc_name() static 2023-06-12 15:16:19 +02:00
message scsi: message: fusion: Add HAS_IOPORT dependencies 2023-05-31 19:59:26 -04:00
mfd mfd: intel-lpss: Fix the fractional clock divider flags 2024-01-25 15:35:49 -08:00
misc misc: mei: client.c: fix problem of return '-EOVERFLOW' in mei_cl_write 2023-12-13 18:45:29 +01:00
mmc mmc: mmc_spi: remove custom DMA mapped buffers 2024-01-31 16:18:55 -08:00
most staging: most: Replace all non-returning strlcpy with strscpy 2023-06-01 07:07:37 -07:00
mtd mtd: rawnand: Clarify conditions to enable continuous reads 2024-01-31 16:18:50 -08:00
mux mux: Explicitly include correct DT includes 2023-08-28 13:36:24 -05:00
net hv_netvsc: Calculate correct ring size when PAGE_SIZE is not 4 Kbytes 2024-01-31 16:19:06 -08:00
nfc nfc: virtual_ncidev: Add variable to check if ndev is running 2023-12-20 17:01:59 +01:00
ntb ntb: Check tx descriptors outstanding instead of head/tail for tx queue 2023-08-22 12:38:19 -04:00
nubus nubus: Don't list slot resources by default 2023-05-22 13:51:56 +02:00
nvdimm nd_btt: Make BTT lanes preemptible 2023-11-20 11:59:19 +01:00
nvme nvmet-tcp: Fix the H2C expected PDU len calculation 2024-01-25 15:35:55 -08:00
nvmem nvmem: brcm_nvram: store a copy of NVRAM content 2024-01-01 12:42:44 +00:00
of of: unittest: Fix of_count_phandle_with_args() expected value message 2024-01-25 15:35:40 -08:00
opp OPP: Pass rounded rate to _set_opp() 2024-01-31 16:18:49 -08:00
parisc parisc/power: Fix power soft-off button emulation on qemu 2024-01-31 16:18:52 -08:00
parport parport: parport_serial: Add Brainboxes device IDs and geometry 2024-01-20 11:51:48 +01:00
pci PCI: mediatek-gen3: Fix translation window size calculation 2024-01-25 15:35:55 -08:00
pcmcia pcmcia: ds: fix possible name leak in error path in pcmcia_device_add() 2023-11-20 11:59:31 +01:00
peci Update peci-next for v6.6-rc1 2023-08-08 10:53:30 +02:00
perf drivers/perf: hisi: Fix some event id for HiSilicon UC pmu 2024-01-25 15:35:13 -08:00
phy phy: sunplus: return negative error code in sp_usb_phy_probe 2024-01-10 17:16:57 +01:00
pinctrl pinctrl: cy8c95x0: Fix get_pincfg 2024-01-20 11:51:46 +01:00
platform platform/x86: p2sb: Allow p2sb_bar() calls during PCI device probe 2024-01-31 16:19:07 -08:00
pmdomain pmdomain: imx: Make imx pgc power domain also set the fwnode 2023-11-28 17:20:00 +00:00
pnp PNP: ACPI: Fix string truncation warning 2023-08-17 19:38:35 +02:00
power power: supply: Fix null pointer dereference in smb2_probe 2024-01-25 15:35:54 -08:00
powercap powercap: DTPM: Fix missing cpufreq_cpu_put() calls 2023-12-13 18:45:25 +01:00
pps driver core: class: remove module * from class_create() 2023-03-17 15:16:33 +01:00
ps3 driver/ps3: Include <video/cmdline.h> for mode parsing 2023-02-20 14:56:51 +01:00
ptp ptp: annotate data-race around q->head and q->tail 2023-11-28 17:19:51 +00:00
pwm pwm: Fix out-of-bounds access in of_pwm_single_xlate() 2024-01-25 15:35:46 -08:00
rapidio Mainly singleton patches all over the place. Series of note are: 2023-04-27 19:57:00 -07:00
ras ras/debugfs: Fix error checking for debugfs_create_dir() 2023-05-16 21:12:23 +02:00
regulator regulator: qcom-rpmh: Fix smps4 regulator for pm8550ve 2023-11-20 11:59:07 +01:00
remoteproc remoteproc updates for v6.6 2023-09-04 15:12:26 -07:00
reset reset: hisilicon: hi6220: fix Wvoid-pointer-to-enum-cast warning 2024-01-20 11:51:44 +01:00
rpmsg rpmsg: virtio: Free driver_override when rpmsg_remove() 2024-01-31 16:18:50 -08:00
rtc rtc: Extend timeout for waiting for UIP to clear to 1s 2024-01-31 16:18:56 -08:00
s390 s390/vfio-ap: do not reset queue removed from host config 2024-01-31 16:18:51 -08:00
sbus sbus: Explicitly include correct DT includes 2023-08-28 13:36:24 -05:00
scsi scsi: core: Kick the requeue list after inserting when flushing 2024-01-31 16:18:48 -08:00
sh sh: intc: move to use bus_get_dev_root() 2023-03-17 15:29:55 +01:00
siox siox: fix possible memory leak in siox_device_add() 2022-11-09 15:40:14 +01:00
slimbus driver core: make struct bus_type.uevent() take a const * 2023-01-27 13:45:52 +01:00
soc soc: fsl: cpm1: qmc: Fix rx channel reset 2024-01-31 16:18:51 -08:00
soundwire soundwire: fix initializing sysfs for same devices on different buses 2024-01-31 16:18:47 -08:00
spi spi: coldfire-qspi: Remove an erroneous clk_disable_unprepare() from the remove function 2024-01-25 15:35:55 -08:00
spmi spmi: mtk-pmif: Serialize PMIF status check and command submission 2024-01-25 15:35:53 -08:00
ssb driver core: make struct bus_type.uevent() take a const * 2023-01-27 13:45:52 +01:00
staging media: rkvdec: Hook the (TRY_)DECODER_CMD stateless ioctls 2024-01-25 15:35:32 -08:00
target scsi: target: core: add missing file_{start,end}_write() 2024-01-25 15:35:45 -08:00
tc The main MIPS changes for 5.6: 2020-01-31 11:28:31 -08:00
tee tee: optee: Fix supplicant based device enumeration 2023-12-13 18:45:11 +01:00
thermal thermal: gov_power_allocator: avoid inability to reset a cdev 2024-01-31 16:19:10 -08:00
thunderbolt thunderbolt: Fix memory leak in margining_port_remove() 2024-01-01 12:42:46 +00:00
tty serial: sc16is7xx: fix unconditional activation of THRI interrupt 2024-01-31 16:19:10 -08:00
ufs scsi: ufs: core: Remove the ufshcd_hba_exit() call from ufshcd_async_scan() 2024-01-31 16:18:48 -08:00
uio uio: Fix use-after-free in uio_open 2024-01-20 11:51:48 +01:00
usb usb: xhci-mtk: fix a short packet issue of gen1 isoc-in transfer 2024-01-25 15:35:54 -08:00
vdpa vdpa: Fix an error handling path in eni_vdpa_probe() 2024-01-25 15:35:54 -08:00
vfio hisi_acc_vfio_pci: Update migration data pointer correctly on saving/resume 2024-01-25 15:35:55 -08:00
vhost virtio/vsock: send credit update during setting SO_RCVLOWAT 2024-01-25 15:35:26 -08:00
video fbdev: flush deferred IO before closing 2024-01-25 15:35:45 -08:00
virt virt: sevguest: Fix passing a stack buffer as a scatterlist target 2023-11-20 11:59:30 +01:00
virtio virtio_ring: fix syncs DMA memory with different direction 2024-01-05 15:19:41 +01:00
vlynq bus: Make remove callback return void 2021-07-21 11:53:42 +02:00
w1 w1: ds2482: Switch back to use struct i2c_driver's .probe() 2023-09-13 10:48:42 +02:00
watchdog watchdog: rti_wdt: Drop runtime pm reference count when watchdog is unused 2024-01-25 15:35:37 -08:00
xen swiotlb-xen: provide the "max_mapping_size" method 2023-12-03 07:33:07 +01:00
zorro zorro: Include zorro.h in names.c 2023-08-21 13:27:44 +02:00
Kconfig Merge patch series "Add non-coherent DMA support for AX45MP" 2023-09-08 11:24:34 -07:00
Makefile pmdomain: Rename the genpd subsystem to pmdomain 2023-09-13 11:09:21 +02:00