From: Andrew Lunn <andrew@lunn.ch>
To: Yun Zhou <yun.zhou@windriver.com>
Cc: marcin.s.wojtas@gmail.com, andrew+netdev@lunn.ch,
davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
pabeni@redhat.com, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] net: mvneta_bm: add suspend/resume to prevent crash after resume
Date: Thu, 11 Jun 2026 08:03:45 +0200 [thread overview]
Message-ID: <922113c3-7fd0-4f15-9fa0-7e9a540409dd@lunn.ch> (raw)
In-Reply-To: <20260611020935.1933865-1-yun.zhou@windriver.com>
On Thu, Jun 11, 2026 at 10:09:35AM +0800, Yun Zhou wrote:
> The mvneta driver uses the hardware Buffer Manager (BM) for RX buffer
> allocation. During suspend, mvneta disables its clock, causing BM to
> lose all buffer address state. On resume, mvneta_bm_port_init() re-
> attaches the BM pool to the NIC, but BM hardware returns stale/garbage
> buffer addresses. When NAPI poll processes these buffers, DMA cache
> sync hits an invalid virtual address causing a kernel panic:
Has this never worked, or has something changed recently which broke
it?
Andrew
next prev parent reply other threads:[~2026-06-11 6:03 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-11 2:09 Yun Zhou
2026-06-11 6:03 ` Andrew Lunn [this message]
2026-06-11 7:23 ` Zhou, Yun
2026-06-12 16:50 ` Simon Horman
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