mirror of
https://github.com/torvalds/linux
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9dd6f1c166
Due to a typo the illegal access interrupt is never cleared in by the interupt handler, causing an effective deadlock on the first illegal access. This was broken since the code was introduced in5433acd81e("MIPS: ralink: add illegal access driver"), but only exposed when the Kconfig symbol was added, thus enabling the code. Cc: <stable@vger.kernel.org> [3.18+] Fixes:a7b7aad383("MIPS: ralink: add missing symbol for RALINK_ILL_ACC") Signed-off-by: Jonas Gorski <jogo@openwrt.org> Cc: linux-mips@linux-mips.org Cc: John Crispin <blogic@openwrt.org> Patchwork: https://patchwork.linux-mips.org/patch/10172/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* Copyright (C) 2013 John Crispin <blogic@openwrt.org>
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*/
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#include <linux/interrupt.h>
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#include <linux/of_platform.h>
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#include <linux/of_irq.h>
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#include <asm/mach-ralink/ralink_regs.h>
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#define REG_ILL_ACC_ADDR 0x10
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#define REG_ILL_ACC_TYPE 0x14
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#define ILL_INT_STATUS BIT(31)
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#define ILL_ACC_WRITE BIT(30)
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#define ILL_ACC_LEN_M 0xff
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#define ILL_ACC_OFF_M 0xf
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#define ILL_ACC_OFF_S 16
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#define ILL_ACC_ID_M 0x7
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#define ILL_ACC_ID_S 8
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#define DRV_NAME "ill_acc"
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static const char * const ill_acc_ids[] = {
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"cpu", "dma", "ppe", "pdma rx", "pdma tx", "pci/e", "wmac", "usb",
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};
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static irqreturn_t ill_acc_irq_handler(int irq, void *_priv)
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{
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struct device *dev = (struct device *) _priv;
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u32 addr = rt_memc_r32(REG_ILL_ACC_ADDR);
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u32 type = rt_memc_r32(REG_ILL_ACC_TYPE);
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dev_err(dev, "illegal %s access from %s - addr:0x%08x offset:%d len:%d\n",
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(type & ILL_ACC_WRITE) ? ("write") : ("read"),
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ill_acc_ids[(type >> ILL_ACC_ID_S) & ILL_ACC_ID_M],
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addr, (type >> ILL_ACC_OFF_S) & ILL_ACC_OFF_M,
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type & ILL_ACC_LEN_M);
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rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE);
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return IRQ_HANDLED;
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}
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static int __init ill_acc_of_setup(void)
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{
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struct platform_device *pdev;
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struct device_node *np;
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int irq;
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/* somehow this driver breaks on RT5350 */
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if (of_machine_is_compatible("ralink,rt5350-soc"))
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return -EINVAL;
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np = of_find_compatible_node(NULL, NULL, "ralink,rt3050-memc");
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if (!np)
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return -EINVAL;
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pdev = of_find_device_by_node(np);
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if (!pdev) {
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pr_err("%s: failed to lookup pdev\n", np->name);
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return -EINVAL;
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}
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irq = irq_of_parse_and_map(np, 0);
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if (!irq) {
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dev_err(&pdev->dev, "failed to get irq\n");
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return -EINVAL;
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}
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if (request_irq(irq, ill_acc_irq_handler, 0, "ill_acc", &pdev->dev)) {
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dev_err(&pdev->dev, "failed to request irq\n");
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return -EINVAL;
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}
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rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE);
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dev_info(&pdev->dev, "irq registered\n");
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return 0;
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}
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arch_initcall(ill_acc_of_setup);
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