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xhci: Do not open code __print_symbolic() in xhci trace events 

commit 045706bff8 upstream.

libtraceevent (used by perf and trace-cmd) failed to parse the
xhci_urb_dequeue trace event. This is because the user space trace
event format parsing is not a full C compiler. It can handle some basic
logic, but is not meant to be able to handle everything C can do.

In cases where a trace event field needs to be converted from a number
to a string, there's the __print_symbolic() macro that should be used:

 See samples/trace_events/trace-events-sample.h

Some xhci trace events open coded the __print_symbolic() causing the
user spaces tools to fail to parse it. This has to be replaced with
__print_symbolic() instead.

CC: stable@vger.kernel.org
Reported-by: Tzvetomir Stoyanov <tstoyanov@vmware.com>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=206531
Fixes: 5abdc2e6e1 ("usb: host: xhci: add urb_enqueue/dequeue/giveback tracers")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20200306150858.21904-2-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Steven Rostedt (VMware) 2020-03-06 17:08:57 +02:00 committed by Greg Kroah-Hartman
parent ac9d327951
commit 039547fbd1
1 changed files with 6 additions and 17 deletions
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23
drivers/usb/host/xhci-trace.h
View File

@ -289,23 +289,12 @@ DECLARE_EVENT_CLASS(xhci_log_urb,
),
TP_printk("ep%d%s-%s: urb %p pipe %u slot %d length %d/%d sgs %d/%d stream %d flags %08x",
__entry->epnum, __entry->dir_in ? "in" : "out",
({ char *s;
switch (__entry->type) {
case USB_ENDPOINT_XFER_INT:
s = "intr";
break;
case USB_ENDPOINT_XFER_CONTROL:
s = "control";
break;
case USB_ENDPOINT_XFER_BULK:
s = "bulk";
break;
case USB_ENDPOINT_XFER_ISOC:
s = "isoc";
break;
default:
s = "UNKNOWN";
} s; }), __entry->urb, __entry->pipe, __entry->slot_id,
__print_symbolic(__entry->type,
{ USB_ENDPOINT_XFER_INT, "intr" },
{ USB_ENDPOINT_XFER_CONTROL, "control" },
{ USB_ENDPOINT_XFER_BULK, "bulk" },
{ USB_ENDPOINT_XFER_ISOC, "isoc" }),
__entry->urb, __entry->pipe, __entry->slot_id,
__entry->actual, __entry->length, __entry->num_mapped_sgs,
__entry->num_sgs, __entry->stream, __entry->flags
)