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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Marek Szyprowski <m.szyprowski@samsung.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
	Chunfeng Yun <chunfeng.yun@mediatek.com>,
	Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [PATCH] USB: mtu3: tracing: fix pointers dereferencing
Message-ID: <20260903141403.3bNG0z7l@linutronix.de>
References: <CGME20260804100540eucas1p24c59c891e91eeeeea8032d1c80312ea3@eucas1p2.samsung.com>
 <20260804100531.88576-1-m.szyprowski@samsung.com>
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In-Reply-To: <20260804100531.88576-1-m.szyprowski@samsung.com>

On 2026-08-04 12:05:30 [+0200], Marek Szyprowski wrote:
> Commit b5cc230af5e5 ("tracing: Warn when an event dereferences a pointer
> in TP_printk()") added a warning then printing an event dereferences
> a pointer, because it might be already freed that time.
> 
> MTU3 driver is one of the drivers triggering this warning. Fix it by
> storing also the DMA address in the event structure to avoid
> dereferencing gpd_ring pointer during event printing.
> 
> Fixes: 83374e035b62 ("usb: mtu3: add tracepoints to help debug")
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>

Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

Just run into this, made the same fix :)

Sebastian