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大连app开发制作,宁波seo搜索引擎优化公司,网站的图片怎么做无法下载,目录和文章wordpress文章目录1. pci显示模块卸载2. free_irq未被调用导致xxfb_pci_unregister报错3. free_irq第二个参数与request_irq最后一个参数不一致导致报错1. pci显示模块卸载 为方便调试显示驱动将pci模块xxfb编译为内核模块#xff0c;卸载命令如下#xff1a; echo 0 /sys/clas…文章目录1. pci显示模块卸载2. free_irq未被调用导致xxfb_pci_unregister报错3. free_irq第二个参数与request_irq最后一个参数不一致导致报错1. pci显示模块卸载为方便调试显示驱动将pci模块xxfb编译为内核模块卸载命令如下echo0/sys/class/vtconsole/vtcon1/bind systemctl stop lightdm rmmod xxfb2. free_irq未被调用导致xxfb_pci_unregister报错pci_disable_msi调free_msi_irqs报错BUG:failure at drivers/pci/msi.c:376/free_msi_irqs()!0Kernel panic-not syncing:BUG!CPU:0PID:3136Comm:rmmod Not tainted5.10.0-00811-g123456789012-dirty #134Hardware name:WIAT WIAT Platform Software,BIOS xxxx-200000May2420206Trace:[ffffffff80918bb0]walk_stackframe0x0/0x100[ffffffff81b011d8]dump_stack0xd0/0x110[ffffffff81af85c8]panic0x1a0/0x4e0[ffffffff811b6df0]free_msi_irqs0xe0/0x270[ffffffff811b78d0]pci_disable_msi0x190/0x1f0[fffff0000021a3b4]cleanup0xf4/0x170[ichfb][fffff0000021a458]xxfb_pci_unregister0x28/0x60[ichfb][ffffffff8119c544]pci_device_remove0x54/0x130[ffffffff814a347c]__device_release_driver0x23c/0x3a0[ffffffff814a5028]driver_detach0x158/0x210[ffffffff814a267c]bus_remove_driver0x8c/0x150[ffffffff814a5a28]driver_unregister0x48/0xa0[ffffffff8119be34]pci_unregister_driver0x34/0x110[fffff0000022b330]xxfb_exit0x20/0x38[ichfb][ffffffff80a335fc]sys_delete_module0x1cc/0x370[ffffffff80912014]entSys0xf4/0x110[ffffffff80c08084]sys_close0x24/0x702SMP:stopping secondary CPUs0---[end Kernel panic-not syncing:BUG!]---看下free_msi_irqsstaticvoidfree_msi_irqs(structpci_dev*dev){structlist_head*msi_listdev_to_msi_list(dev-dev);structmsi_desc*entry,*tmp;structattribute**msi_attrs;structdevice_attribute*dev_attr;inti,count0;for_each_pci_msi_entry(entry,dev)if(entry-irq)for(i0;ientry-nvec_used;i)BUG_ON(irq_has_action(entry-irqi));//报错地方pci_msi_teardown_msi_irqs(dev);...报错处BUG_ON逻辑为真的函数irq_has_action(entry-irq i))staticinlineintirq_desc_has_action(structirq_desc*desc){returndesc-action!NULL;}也即desc-action未释放。查看代码DC DMA申请了未释放xxfbhw_dma_init中调用了errrequest_irq(xx_par-irq_dma,xxfbhw_dma_irq_handler,IRQF_SHARED,DMA_TRANSFER_IRQ,xx_par);xxfbhw_dma_exit未调用free_irq进行irq_dma释放。DMA是非共享中断因此在xxfbhw_dma_exit中添加free_irqxxfbhw_dma_exit{...free_irq(xx_par-irq_dma,0);//to add}3. free_irq第二个参数与request_irq最后一个参数不一致导致报错constvoid*free_irq(unsignedintirq,void*dev_id)//dev_id----------------------------------------------------staticinlineint__must_checkrequest_irq(unsignedintirq,irq_handler_thandler,unsignedlongflags,constchar*name,void*dev)//devxxfbhw_dma_exit中添加free_irq(xx_par-irq_dma, 0)后依然报错Trying to free already-free IRQ XX4------------[cut here]------------4WARNING:CPU:1PID:733at kernel/irq/manage.c:1751free_irq0x32c/0x630Trying to free already-free IRQ58Modules linked in:cxxfb(-)c ngbec sch_fq_codelc efivarfsc ipv6c CPU:0PID:3136Comm:rmmod Not tainted5.10.0-00811-g123456789012-dirty #134Hardware name:WIAT WIAT Platform Software,BIOS xxxx-200000May2420206Trace:[ffffffff80918bb0]walk_stackframe0x0/0x100[ffffffff81b011d8]dump_stack0xd0/0x110[ffffffff80959a5c]__warn0x13c/0x1f0[ffffffff809e8478]free_irq0x328/0x630[ffffffff809e8478]free_irq0x328/0x630[ffffffff81af89d4]warn_slowpath_fmt0xcc/0x100[ffffffff809e8478]free_irq0x328/0x630[ffffffff809e8478]free_irq0x328/0x630[ffffffff81003b4c]debugfs_rename0x3bc/0x3c0[ffffffff80c42cc4]mntput_no_expire0x184/0x3f0[fffff00000229014]xxfbhw_dma_exit0x94/0xf0[xxfb][fffff0000021a420]cleanup0x160/0x170[xxfb][fffff0000021a458]xxfb_pci_unregister0x28/0x60[xxfb][ffffffff8119c544]pci_device_remove0x54/0x130[ffffffff814a347c]__device_release_driver0x23c/0x3a0[ffffffff814a5028]driver_detach0x158/0x210[ffffffff814a267c]bus_remove_driver0x8c/0x150[ffffffff814a5a28]driver_unregister0x48/0xa0[ffffffff8119be34]pci_unregister_driver0x34/0x110[fffff0000022b350]xxfb_exit0x20/0x38[xxfb]free_irq 第二个参数要与request_irq最后一个参数一致修改为free_irq(xx_par-irq_dma, xx_par)后正常。