AuxXxilium/linux_dsm_epyc7002
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0b6bfad4ce
linux_dsm_epyc7002/drivers/spi
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Serge Semin 0b6bfad4ce
spi: spi-dw: Remove extraneous locking 
There is no point in having the commit 19b61392c5 ("spi: spi-dw: Add
lock protect dw_spi rx/tx to prevent concurrent calls") applied. The
commit author made an assumption that the problem with the rx data
mismatch was due to the lack of the data protection. While most likely it
was caused by the lack of the memory barrier. So having the
commit bfda044533 ("spi: dw: use "smp_mb()" to avoid sending spi data
error") applied would be enough to fix the problem.

Indeed the spin unlock operation makes sure each memory operation issued
before the release will be completed before it's completed. In other words
it works as an implicit one way memory barrier. So having both smp_mb()
and the spin_unlock_irqrestore() here is just redundant. One of them would
be enough. It's better to leave the smp_mb() since the Tx/Rx buffers
consistency is provided by the data transfer algorithm implementation:
first we initialize the buffers pointers, then make sure the assignments
are visible by the other CPUs by calling the smp_mb(), only after that
enable the interrupt, which handler uses the buffers.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Link: https://lore.kernel.org/r/20200920112914.26501-5-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Mark Brown <broonie@kernel.org>
2020-09-29 17:22:28 +01:00
..
atmel-quadspi.c spi: atmel-quadspi: Use optimezed memcpy_fromio()/memcpy_toio() 2020-07-17 00:55:24 +01:00
internals.h
Kconfig spi: qup: Allow for compile-testing on !ARM 2020-09-07 19:04:23 +01:00
Makefile Merge series "mtd: spi-nor: Move cadence-qaudspi to spi-mem framework" from Vignesh Raghavendra <vigneshr@ti.com>: 2020-06-19 14:26:55 +01:00
spi-altera.c spi: altera: fix module autoload 2020-06-24 16:37:47 +01:00
spi-amd.c spi: spi-amd: Do not define 'struct acpi_device_id' when !CONFIG_ACPI 2020-07-17 16:38:56 +01:00
spi-ar934x.c spi: add driver for ar934x spi controller 2020-02-11 11:37:30 +00:00
spi-armada-3700.c spi: a3700: Remove a useless memset 2020-08-18 17:52:37 +01:00
spi-at91-usart.c spi: spi-at91-usart: Remove unused OF table 'struct of_device_id' 2020-07-17 16:38:54 +01:00
spi-ath79.c spi: ath79: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:15:29 +01:00
spi-atmel.c spi: atmel: Simplify with dev_err_probe() 2020-09-08 18:19:24 +01:00
spi-au1550.c
spi-axi-spi-engine.c spi: spi-axi-spi-engine: Access register after clock initialization 2020-04-09 18:46:53 +01:00
spi-bcm63xx-hsspi.c spi: bcm63xx-hsspi: add reset support 2020-06-17 14:29:58 +01:00
spi-bcm63xx.c spi: bcm63xx-spi: add reset support 2020-06-17 14:29:58 +01:00
spi-bcm2835.c spi: bcm2835: Make polling_limit_us static 2020-09-14 15:50:15 +01:00
spi-bcm2835aux.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
spi-bcm-qspi.c spi: bcm-qspi: Clean up 7425, 7429, and 7435 settings 2020-09-14 15:50:08 +01:00
spi-bcm-qspi.h
spi-bitbang-txrx.h
spi-bitbang.c spi: spi-bitbang: Demote obvious misuse of kerneldoc to standard comment blocks 2020-07-17 16:38:45 +01:00
spi-brcmstb-qspi.c
spi-butterfly.c spi: docs: convert to ReST and add it to the kABI bookset 2019-07-31 14:13:13 -06:00
spi-cadence-quadspi.c spi: cadence-quadspi: Simplify with dev_err_probe() 2020-09-08 18:19:26 +01:00
spi-cadence.c spi: spi-cadence: add support for chip select high 2020-07-22 01:55:51 +01:00
spi-cavium-octeon.c spi: octeon: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:17:27 +01:00
spi-cavium-thunderx.c spi: spi-cavium-thunderx: flag controller as half duplex 2020-06-16 00:38:39 +01:00
spi-cavium.c spi: use new spi_transfer_delay_exec helper where straightforward 2019-10-15 11:51:57 +01:00
spi-cavium.h
spi-clps711x.c spi: clps711x: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:17:36 +01:00
spi-coldfire-qspi.c spi: coldfire-qspi: Use clk_prepare_enable and clk_disable_unprepare 2020-07-17 00:55:26 +01:00
spi-davinci.c Remove uninitialized_var() macro for v5.9-rc1 2020-08-04 13:49:43 -07:00
spi-dln2.c
spi-dw-core.c spi: spi-dw: Remove extraneous locking 2020-09-29 17:22:28 +01:00
spi-dw-dma.c spi: dw-dma: Fix Tx DMA channel working too fast 2020-07-21 23:43:24 +01:00
spi-dw-mmio.c spi: dw: Add KeemBay Master capability 2020-09-29 17:22:27 +01:00
spi-dw-pci.c spi: dw-pci: free previously allocated IRQs if desc->setup() fails 2020-09-17 19:56:04 +01:00
spi-dw.h spi: spi-dw: Remove extraneous locking 2020-09-29 17:22:28 +01:00
spi-efm32.c spi: efm32: Convert to use GPIO descriptors 2020-03-27 15:52:23 +00:00
spi-ep93xx.c spi: spi-ep93xx: Fix API slippage 2020-07-17 16:38:47 +01:00
spi-falcon.c spi: spi-falcon: extend warning to delay as well 2019-10-15 11:46:57 +01:00
spi-fsi.c spi: fsi: Check mux status before transfers 2020-09-17 19:31:43 +01:00
spi-fsl-cpm.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
spi-fsl-cpm.h
spi-fsl-dspi.c spi: spi-fsl-dspi: use XSPI mode instead of DMA for DPAA2 SoCs 2020-09-14 15:50:14 +01:00
spi-fsl-espi.c spi: spi-fsl-espi: Remove use of %p 2020-08-25 22:46:50 +01:00
spi-fsl-lib.c
spi-fsl-lib.h spi: fsl: Convert to use CS GPIO descriptors 2019-08-28 14:10:41 +01:00
spi-fsl-lpspi.c spi: lpspi: Remove CONFIG_PM_SLEEP ifdefery 2020-08-18 17:52:36 +01:00
spi-fsl-qspi.c spi: Fix SPI NOR and SPI NAND acronyms 2020-07-17 00:55:25 +01:00
spi-fsl-spi.c spi: fsl: add missing __iomem annotation 2020-07-01 23:21:26 +01:00
spi-fsl-spi.h
spi-geni-qcom.c spi: spi-geni-qcom: Don't wait to start 1st transfer if transmitting 2020-09-14 15:50:16 +01:00
spi-gpio.c Merge branch 'for-5.4' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi into spi-5.5 2019-10-08 19:12:28 +01:00
spi-hisi-sfc-v3xx.c spi: hisi-sfc-v3xx: fix spelling mistake "occured" -> "occurred" 2020-09-28 20:33:56 +01:00
spi-img-spfi.c spi: img-spfi: Convert to use GPIO descriptors 2020-07-01 23:21:29 +01:00
spi-imx.c spi: spi-imx: spi_imx_transfer(): add support for effective_speed_hz 2020-09-23 19:59:32 +01:00
spi-iproc-qspi.c
spi-jcore.c remove ioremap_nocache and devm_ioremap_nocache 2020-01-06 09:45:59 +01:00
spi-lantiq-ssc.c spi: lantiq: remove redundant irqsave and irqrestore in hardIRQ 2020-09-17 19:56:02 +01:00
spi-lm70llp.c spi: docs: convert to ReST and add it to the kABI bookset 2019-07-31 14:13:13 -06:00
spi-loopback-test.c spi: spi-loopback-test: Fix formatting issues in function header blocks 2020-07-17 16:38:44 +01:00
spi-lp8841-rtc.c spi: lp-8841: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:18:35 +01:00
spi-mem.c spi: spi-mem: allow specifying a command's extension 2020-07-14 17:29:38 +01:00
spi-meson-spicc.c spi: spi-meson-spicc: Remove set but never used variable 'data' from meson_spicc_reset_fifo() 2020-07-17 16:38:48 +01:00
spi-meson-spifc.c spi: spi-meson-spifc: Fix misdocumenting of 'dev' in 'struct meson_spifc' 2020-07-17 16:38:48 +01:00
spi-mpc52xx-psc.c spi: use new spi_transfer_delay_exec helper where straightforward 2019-10-15 11:51:57 +01:00
spi-mpc52xx.c
spi-mpc512x-psc.c spi: use new spi_transfer_delay_exec helper where straightforward 2019-10-15 11:51:57 +01:00
spi-mt65xx.c spi: mediatek: add spi support for mt8192 IC 2020-07-22 01:56:00 +01:00
spi-mt7621.c spi: mt7621: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:19:34 +01:00
spi-mtk-nor.c spi: spi-mtk-nor: fix timeout calculation overflow 2020-09-25 21:40:20 +01:00
spi-mux.c spi: spi-mux: Simplify with dev_err_probe() 2020-09-08 18:19:27 +01:00
spi-mxic.c spi: spi-mem: allow specifying a command's extension 2020-07-14 17:29:38 +01:00
spi-mxs.c spi: mxs: Drop GPIO includes 2020-03-17 13:20:16 +00:00
spi-npcm-fiu.c spi: npcm-fiu: simplify the return expression of npcm_fiu_probe() 2020-09-22 01:04:19 +01:00
spi-npcm-pspi.c spi: npcm-pspi: Convert to use GPIO descriptors 2020-07-01 23:21:28 +01:00
spi-nxp-fspi.c spi: spi-nxp-fspi: Add ACPI support 2020-09-17 19:56:03 +01:00
spi-oc-tiny.c SPI SUBSYSTEM: Replace HTTP links with HTTPS ones 2020-07-09 22:41:11 +01:00
spi-omap2-mcspi.c spi: omap2-mcspi: Improve performance waiting for CHSTAT 2020-09-22 01:04:20 +01:00
spi-omap-100k.c spi: omap-100k: Drop include 2020-07-14 17:38:46 +01:00
spi-omap-uwire.c spi: omap-uwire: Use clk_prepare_enable and clk_disable_unprepare 2020-07-15 15:58:33 +01:00
spi-orion.c spi: Fix SPI NOR and SPI NAND acronyms 2020-07-17 00:55:25 +01:00
spi-pic32-sqi.c spi: pic32-sqi: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:20:52 +01:00
spi-pic32.c spi: pic32: Retire dma_request_slave_channel_compat() 2019-11-22 19:53:41 +00:00
spi-pl022.c spi: spi-pl022: Provide missing struct attribute/function param docs 2020-07-17 16:38:50 +01:00
spi-ppc4xx.c spi: ppc4xx: Convert to use GPIO descriptors 2020-07-22 01:55:52 +01:00
spi-pxa2xx-dma.c
spi-pxa2xx-pci.c
spi-pxa2xx.c spi: spi-pxa2xx: Do not define 'struct acpi_device_id' when !CONFIG_ACPI 2020-07-17 16:38:55 +01:00
spi-pxa2xx.h
spi-qcom-qspi.c spi: spi-qcom-qspi: replace spin_lock_irqsave by spin_lock in hard IRQ 2020-09-14 15:50:10 +01:00
spi-qup.c spi: qup: remove redundant assignment to variable ret 2020-09-14 15:50:04 +01:00
spi-rb4xx.c spi: rb4xx: update driver to be device tree aware 2020-05-22 14:13:17 +01:00
spi-rockchip.c spi: rockchip: Fix error in SPI slave pio read 2020-07-28 17:29:31 +01:00
spi-rpc-if.c spi: add Renesas RPC-IF driver 2020-06-16 00:38:38 +01:00
spi-rspi.c spi: rspi: Fill in controller speed limits 2020-08-20 22:38:17 +01:00
spi-s3c24xx-fiq.h
spi-s3c24xx-fiq.S
spi-s3c24xx.c spi: s3c24xx: correct kerneldoc comment 2020-08-18 17:52:39 +01:00
spi-s3c64xx.c spi: spi-s3c64xx: Add missing entries for structs 's3c64xx_spi_dma_data' and 's3c64xx_spi_dma_data' 2020-07-17 16:38:49 +01:00
spi-sc18is602.c spi: sc18is602: Fix a typo in MODULE_DESCRIPTION 2020-04-14 12:39:37 +01:00
spi-sh-hspi.c spi: use new spi_transfer_delay_exec helper where straightforward 2019-10-15 11:51:57 +01:00
spi-sh-msiof.c spi: spi-sh-msiof: Fix checkpatch error Complex macros should use () 2020-04-14 18:36:34 +01:00
spi-sh-sci.c
spi-sh.c spi: Remove dev_err() usage after platform_get_irq() 2019-08-02 12:15:43 +01:00
spi-sifive.c spi: sifive: disable clk when probe fails and remove 2019-11-04 13:26:11 +00:00
spi-sirf.c spi: sirf: Use dma_request_chan() instead dma_request_slave_channel() 2019-12-16 11:57:36 +00:00
spi-slave-mt27xx.c spi: mediatek: Use devm_platform_ioremap_resource() in mtk_spi_slave_probe() 2019-10-01 12:34:58 +01:00
spi-slave-system-control.c
spi-slave-time.c
spi-sprd-adi.c spi: sprd: Simplify with dev_err_probe() 2020-09-14 15:50:17 +01:00
spi-sprd.c spi: sprd: Simplify with dev_err_probe() 2020-09-14 15:50:17 +01:00
spi-st-ssc4.c spi: st-ssc4: add missed pm_runtime_disable 2019-11-18 12:59:11 +00:00
spi-stm32-qspi.c spi: stm32-qspi: Fix error path in case of -EPROBE_DEFER 2020-06-17 13:26:41 +01:00
spi-stm32.c spi: stm32: Simplify with dev_err_probe() 2020-09-08 18:19:29 +01:00
spi-sun4i.c spi: sun4i: update max transfer size reported 2020-07-27 14:55:21 +01:00
spi-sun6i.c spi: spi-sun6i: sun6i_spi_transfer_one(): enable RF_RDY interrupt only if needed 2020-07-07 10:41:41 +01:00
spi-synquacer.c spi: synquacer: Simplify with dev_err_probe() 2020-09-08 18:19:29 +01:00
spi-tegra20-sflash.c spi: tegra20-sflash: Fix runtime PM imbalance on error 2020-05-28 14:01:16 +01:00
spi-tegra20-slink.c spi: tegra20: Simplify with dev_err_probe() 2020-09-08 18:19:31 +01:00
spi-tegra114.c spi: tegra114: Simplify with dev_err_probe() 2020-09-08 18:19:30 +01:00
spi-test.h
spi-ti-qspi.c SPI SUBSYSTEM: Replace HTTP links with HTTPS ones 2020-07-09 22:41:11 +01:00
spi-tle62x0.c
spi-topcliff-pch.c spi/topcliff-pch: drop double zeroing 2020-09-21 17:56:38 +01:00
spi-txx9.c spi: txx9: Convert to use GPIO descriptors 2019-10-30 14:14:32 +00:00
spi-uniphier.c spi: uniphier: Use devm_platform_get_and_ioremap_resource() to simplify code 2020-05-11 18:17:52 +01:00
spi-xcomm.c spi: use new spi_transfer_delay_exec helper where straightforward 2019-10-15 11:51:57 +01:00
spi-xilinx.c spi: xilinx: Fix info message during probe 2020-09-17 19:56:01 +01:00
spi-xlp.c spi: xlp: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:23:28 +01:00
spi-xtensa-xtfpga.c spi: xtensa-xtfpga: Use devm_platform_ioremap_resource() in xtfpga_spi_probe() 2019-10-01 12:35:18 +01:00
spi-zynq-qspi.c spi: spi-zynq-qspi: Add description for 2 missing attributes/parameters 2020-07-17 16:38:51 +01:00
spi-zynqmp-gqspi.c spi: spi-zynqmp-gqspi: Fix incorrect indentation 2020-09-24 12:59:29 +01:00
spi.c spi: Fixes for v5.9 2020-08-18 14:27:12 -07:00
spidev.c spi: spidev: Remove redundant initialization of variable status 2020-09-09 16:27:46 +01:00