From: Thomas Gleixner tglx@linutronix.de
commit c330fb1ddc0a922f044989492b7fcca77ee1db46 upstream.
handler data is meant for interrupt handlers and not for storing irq chip specific information as some devices require handler data to store internal per interrupt information, e.g. pinctrl/GPIO chained interrupt handlers.
This obviously creates a conflict of interests and crashes the machine because the XEN pointer is overwritten by the driver pointer.
As the XEN data is not handler specific it should be stored in irqdesc::irq_data::chip_data instead.
A simple sed s/irq_[sg]et_handler_data/irq_[sg]et_chip_data/ cures that.
Cc: stable@vger.kernel.org Reported-by: Roman Shaposhnik roman@zededa.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Tested-by: Roman Shaposhnik roman@zededa.com Reviewed-by: Juergen Gross jgross@suse.com Link: https://lore.kernel.org/r/87lfi2yckt.fsf@nanos.tec.linutronix.de Signed-off-by: Juergen Gross jgross@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/xen/events/events_base.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-)
--- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -155,7 +155,7 @@ int get_evtchn_to_irq(unsigned evtchn) /* Get info for IRQ */ struct irq_info *info_for_irq(unsigned irq) { - return irq_get_handler_data(irq); + return irq_get_chip_data(irq); }
/* Constructors for packed IRQ information. */ @@ -384,7 +384,7 @@ static void xen_irq_init(unsigned irq) info->type = IRQT_UNBOUND; info->refcnt = -1;
- irq_set_handler_data(irq, info); + irq_set_chip_data(irq, info);
list_add_tail(&info->list, &xen_irq_list_head); } @@ -433,14 +433,14 @@ static int __must_check xen_allocate_irq
static void xen_free_irq(unsigned irq) { - struct irq_info *info = irq_get_handler_data(irq); + struct irq_info *info = irq_get_chip_data(irq);
if (WARN_ON(!info)) return;
list_del(&info->list);
- irq_set_handler_data(irq, NULL); + irq_set_chip_data(irq, NULL);
WARN_ON(info->refcnt > 0);
@@ -610,7 +610,7 @@ EXPORT_SYMBOL_GPL(xen_irq_from_gsi); static void __unbind_from_irq(unsigned int irq) { int evtchn = evtchn_from_irq(irq); - struct irq_info *info = irq_get_handler_data(irq); + struct irq_info *info = irq_get_chip_data(irq);
if (info->refcnt > 0) { info->refcnt--; @@ -1114,7 +1114,7 @@ int bind_ipi_to_irqhandler(enum ipi_vect
void unbind_from_irqhandler(unsigned int irq, void *dev_id) { - struct irq_info *info = irq_get_handler_data(irq); + struct irq_info *info = irq_get_chip_data(irq);
if (WARN_ON(!info)) return; @@ -1148,7 +1148,7 @@ int evtchn_make_refcounted(unsigned int if (irq == -1) return -ENOENT;
- info = irq_get_handler_data(irq); + info = irq_get_chip_data(irq);
if (!info) return -ENOENT; @@ -1176,7 +1176,7 @@ int evtchn_get(unsigned int evtchn) if (irq == -1) goto done;
- info = irq_get_handler_data(irq); + info = irq_get_chip_data(irq);
if (!info) goto done;