From: Ran Wang Date: Mon, 23 Nov 2020 02:57:15 +0000 (+0800) Subject: spi: spi-nxp-fspi: fix fspi panic by unexpected interrupts X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=71d80563b0760a411cd90a3680536f5d887fff6b;p=linux.git spi: spi-nxp-fspi: fix fspi panic by unexpected interrupts Given the case that bootloader(such as UEFI)'s FSPI driver might not handle all interrupts before loading kernel, those legacy interrupts would assert immidiately once kernel's FSPI driver enable them. Further, if it was FSPI_INTR_IPCMDDONE, the irq handler nxp_fspi_irq_handler() would call complete(&f->c) to notify others. However, f->c might not be initialized yet at that time, then cause kernel panic. Of cause, we should fix this issue within bootloader. But it would be better to have this pacth to make dirver more robust (by clearing all interrupt status bits before enabling interrupts). Suggested-by: Han Xu Signed-off-by: Ran Wang Link: https://lore.kernel.org/r/20201123025715.14635-1-ran.wang_1@nxp.com Signed-off-by: Mark Brown --- diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c index 0d41406c036de..ab9035662717a 100644 --- a/drivers/spi/spi-nxp-fspi.c +++ b/drivers/spi/spi-nxp-fspi.c @@ -1001,6 +1001,7 @@ static int nxp_fspi_probe(struct platform_device *pdev) struct resource *res; struct nxp_fspi *f; int ret; + u32 reg; ctlr = spi_alloc_master(&pdev->dev, sizeof(*f)); if (!ctlr) @@ -1032,6 +1033,12 @@ static int nxp_fspi_probe(struct platform_device *pdev) goto err_put_ctrl; } + /* Clear potential interrupts */ + reg = fspi_readl(f, f->iobase + FSPI_INTR); + if (reg) + fspi_writel(f, reg, f->iobase + FSPI_INTR); + + /* find the resources - controller memory mapped space */ if (is_acpi_node(f->dev->fwnode)) res = platform_get_resource(pdev, IORESOURCE_MEM, 1);