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While debugging an unrelated issue with the GICv3 ITS driver, the following trace triggered: WARNING: CPU: 1 PID: 1 at kernel/irq/irqdomain.c:1121 irq_domain_free_irqs+0x160/0x17c() NULL pointer, cannot free irq Modules linked in: CPU: 1 PID: 1 Comm: swapper/0 Tainted: G W 3.19.0-rc6+ #3690 Hardware name: FVP Base (DT) Call trace: [<ffffffc000089398>] dump_backtrace+0x0/0x13c [<ffffffc0000894e4>] show_stack+0x10/0x1c [<ffffffc00066d134>] dump_stack+0x74/0x94 [<ffffffc0000a92f8>] warn_slowpath_common+0x9c/0xd4 [<ffffffc0000a938c>] warn_slowpath_fmt+0x5c/0x80 [<ffffffc0000ee04c>] irq_domain_free_irqs+0x15c/0x17c [<ffffffc0000ef918>] msi_domain_free_irqs+0x58/0x74 [<ffffffc000386f58>] free_msi_irqs+0xb4/0x1c0 // The msi_prepare callback fails here [<ffffffc0003872c0>] pci_enable_msix+0x25c/0x3d4 [<ffffffc00038746c>] pci_enable_msix_range+0x34/0x80 [<ffffffc0003924ac>] vp_try_to_find_vqs+0xec/0x528 [<ffffffc000392954>] vp_find_vqs+0x6c/0xa8 [<ffffffc0003ee2a8>] init_vq+0x120/0x248 [<ffffffc0003eefb0>] virtblk_probe+0xb0/0x6bc [<ffffffc00038fc34>] virtio_dev_probe+0x17c/0x214 [<ffffffc0003d4a04>] driver_probe_device+0x7c/0x23c [<ffffffc0003d4cb0>] __driver_attach+0x98/0xa0 [<ffffffc0003d2c60>] bus_for_each_dev+0x60/0xb4 [<ffffffc0003d455c>] driver_attach+0x1c/0x28 [<ffffffc0003d41b0>] bus_add_driver+0x150/0x208 [<ffffffc0003d54c0>] driver_register+0x64/0x130 [<ffffffc00038f9e8>] register_virtio_driver+0x24/0x68 [<ffffffc00091320c>] init+0x70/0xac [<ffffffc0000828f0>] do_one_initcall+0x94/0x1d0 [<ffffffc0008e9b00>] kernel_init_freeable+0x144/0x1e4 [<ffffffc00066a434>] kernel_init+0xc/0xd8 ---[ end trace f9ee562a77cc7bae ]--- The ITS msi_prepare callback having failed, we end-up trying to free MSIs that have never been allocated. Oddly enough, the kernel is pretty upset about it. It turns out that this behaviour was expected before the MSI domain was introduced (and dealt with in arch_teardown_msi_irqs). The obvious fix is to detect this early enough and bail out. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Jiang Liu <jiang.liu@linux.intel.com> Link: http://lkml.kernel.org/r/1422299419-6051-1-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de> |
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| .. | ||
| autoprobe.c | ||
| chip.c | ||
| debug.h | ||
| devres.c | ||
| dummychip.c | ||
| generic-chip.c | ||
| handle.c | ||
| internals.h | ||
| irqdesc.c | ||
| irqdomain.c | ||
| Kconfig | ||
| Makefile | ||
| manage.c | ||
| migration.c | ||
| msi.c | ||
| pm.c | ||
| proc.c | ||
| resend.c | ||
| settings.h | ||
| spurious.c | ||