linux-kernel - Re: [PATCH] usb: dwc3: Clear DWC3_EVENT

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Date:   Tue, 03 Jan 2023 17:48:58 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     JaeHun Jung <jh0801.jung@...sung.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Cc:     "open list:USB XHCI DRIVER" <linux-usb@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Seungchull Suh <sc.suh@...sung.com>,
        Daehwan Jung <dh10.jung@...sung.com>,
        JaeHun Jung <jh0801.jung@...sung.com>
Subject: Re: [PATCH] usb: dwc3: Clear DWC3_EVENT_PENDING when count is 0


Hi,

JaeHun Jung <jh0801.jung@...sung.com> writes:
> Sometimes very rarely, The count is 0 and the DWC3 flag is set has status.
> It must not have these status. Because, It can make happen interrupt storming
> status.
> So, It have to clean up DWC3_EVENT_PENDING flags set when count is 0.
> It means "There are no interrupts to handle.".
>
> (struct dwc3_event_buffer *) ev_buf = 0xFFFFFF883DBF1180 (
> 	(void *) buf = 0xFFFFFFC00DBDD000 = end+0x337D000,
> 	(void *) cache = 0xFFFFFF8839F54080,
> 	(unsigned int) length = 0x1000,
> 	(unsigned int) lpos = 0x0,
> 	(unsigned int) count = 0x0,
> 	(unsigned int) flags = 0x00000001,
> 	(dma_addr_t) dma = 0x00000008BD7D7000,
> 	(struct dwc3 *) dwc = 0xFFFFFF8839CBC880,
> 	(u64) android_kabi_reserved1 = 0x0),
>
> (time = 47557628930999, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
> (time = 47557628931268, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
> (time = 47557628932383, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
> (time = 47557628932652, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
> (time = 47557628933768, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
> (time = 47557628934037, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
> (time = 47557628935152, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
> (time = 47557628935460, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
> (time = 47557628936575, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
> (time = 47557628936845, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
> (time = 47557628937960, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
> (time = 47557628938229, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
> (time = 47557628939345, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
> (time = 47557628939652, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
> (time = 47557628940768, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
> (time = 47557628941037, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
> (time = 47557628942152, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
> (time = 47557628942422, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
> (time = 47557628943537, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
> (time = 47557628943806, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
> (time = 47557628944922, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
> (time = 47557628945229, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
> (time = 47557628946345, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
> (time = 47557628946614, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
> (time = 47557628947729, irq = 165, fn = dwc3_interrupt, latency = 0, en = 1),
> (time = 47557628947999, irq = 165, fn = dwc3_interrupt, latency = 0, en = 3),
>
> Signed-off-by: JaeHun Jung <jh0801.jung@...sung.com>

Please get in the habit of running patches through
scripts/get_maintainer.pl. If you did, it would tell you Thinh is the
new maintainer for dwc3.

-- 
balbi