From: Al Viro Date: Thu, 25 Aug 2005 22:13:14 +0000 (+0100) Subject: [PATCH] late spinlock initialization in ieee1394/ohci X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3515d0161d55d2fa1a340932625f94240a68c262;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git [PATCH] late spinlock initialization in ieee1394/ohci spinlock used in irq handler should be initialized before registering irq, even if we know that our device has interrupts disabled; handler is registered shared and taking spinlock is done unconditionally. As it is, we can and do get oopsen on boot for some configuration, depending on irq routing - I've got a reproducer. Signed-off-by: Al Viro Signed-off-by: Ben Collins Signed-off-by: Linus Torvalds --- diff --git a/drivers/ieee1394/ohci1394.c b/drivers/ieee1394/ohci1394.c index b12a970cc9a3..27018c8efc24 100644 --- a/drivers/ieee1394/ohci1394.c +++ b/drivers/ieee1394/ohci1394.c @@ -478,7 +478,6 @@ static void ohci_initialize(struct ti_ohci *ohci) int num_ports, i; spin_lock_init(&ohci->phy_reg_lock); - spin_lock_init(&ohci->event_lock); /* Put some defaults to these undefined bus options */ buf = reg_read(ohci, OHCI1394_BusOptions); @@ -3402,7 +3401,14 @@ static int __devinit ohci1394_pci_probe(struct pci_dev *dev, /* We hopefully don't have to pre-allocate IT DMA like we did * for IR DMA above. Allocate it on-demand and mark inactive. */ ohci->it_legacy_context.ohci = NULL; + spin_lock_init(&ohci->event_lock); + /* + * interrupts are disabled, all right, but... due to SA_SHIRQ we + * might get called anyway. We'll see no event, of course, but + * we need to get to that "no event", so enough should be initialized + * by that point. + */ if (request_irq(dev->irq, ohci_irq_handler, SA_SHIRQ, OHCI1394_DRIVER_NAME, ohci)) FAIL(-ENOMEM, "Failed to allocate shared interrupt %d", dev->irq);