[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v4 18/18] xen/arm: IRQ: Handle multiple action per IRQ
On Tue, 2014-04-22 at 13:58 +0100, Julien Grall wrote: > On ARM, it may happen (eg ARM SMMU) to setup multiple handler for the same > interrupt. > > To be able to use multiple action, the driver has to explicitly call > {setup,request}_irq with IRQF_SHARED as 2nd parameter. > > The behavior stays the same on x86, e.g only one action is handled. > > Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx> > Cc: Keir Fraser <keir@xxxxxxx> > Cc: Jan Beulich <jbeulich@xxxxxxxx> > > --- > Changes in v4: > - Go back to a single custom linked list. The double linked-list > doesn't fit the requirements (i.e browsing safely without look) and > the llist.h from Linux doesn't allow use to delete a node in the > middle > of the list. Is this variant any safer? > + do > + { > + action->handler(irq, action->dev_id, regs); > + action = action->next; > + } while ( action ); What happens if action is freed and recycled in the midst of this loop? Ian. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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