linux-kernel - [patch V2 11/13] usb: gadget: udc: Remove in_interrupt()/in

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Message-Id: <20201019101110.744172050@linutronix.de>
Date:   Mon, 19 Oct 2020 12:06:40 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        "Ahmed S. Darwish" <a.darwish@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org,
        Thomas Winischhofer <thomas@...ischhofer.net>,
        Johan Hovold <johan@...nel.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Valentina Manea <valentina.manea.m@...il.com>,
        Shuah Khan <shuah@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        linux-omap@...r.kernel.org, Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org,
        Duncan Sands <duncan.sands@...e.fr>
Subject: [patch V2 11/13] usb: gadget: udc: Remove in_interrupt()/in_irq()
 from comments

From: Ahmed S. Darwish <a.darwish@...utronix.de>

The usage of in_irq()/in_interrupt() in drivers is phased out for various
reasons.

The context description for usb_gadget_giveback_request() is misleading as
in_interupt() means: hard interrupt or soft interrupt or bottom half
disabled regions. But it's also invoked from task context when endpoints
are torn down. Remove it as it's more confusing than helpful.

Replace also the in_irq() comment with plain text.

Signed-off-by: Ahmed S. Darwish <a.darwish@...utronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Felipe Balbi <balbi@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org

---
 drivers/usb/gadget/udc/core.c      |    2 --
 drivers/usb/gadget/udc/dummy_hcd.c |    6 ++++--
 2 files changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -894,8 +894,6 @@ EXPORT_SYMBOL_GPL(usb_gadget_unmap_reque
  * @ep: the endpoint to be used with with the request
  * @req: the request being given back
  *
- * Context: in_interrupt()
- *
  * This is called by device controller drivers in order to return the
  * completed request back to the gadget layer.
  */
--- a/drivers/usb/gadget/udc/dummy_hcd.c
+++ b/drivers/usb/gadget/udc/dummy_hcd.c
@@ -1754,8 +1754,10 @@ static int handle_control_request(struct
 	return ret_val;
 }
 
-/* drive both sides of the transfers; looks like irq handlers to
- * both drivers except the callbacks aren't in_irq().
+/*
+ * Drive both sides of the transfers; looks like irq handlers to both
+ * drivers except that the callbacks are invoked from soft interrupt
+ * context.
  */
 static void dummy_timer(struct timer_list *t)
 {