From: Srinivas Kandagatla <srini@kernel.org>
To: Ekansh Gupta <ekansh.gupta@oss.qualcomm.com>,
Jianping Li <jianping.li@oss.qualcomm.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Abel Vesa <abelvesa@kernel.org>,
linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org, quic_chennak@quicinc.com,
stable@kernel.org
Subject: Re: [PATCH v13] misc: fastrpc: Allocate entire reserved memory for Audio PD in probe
Date: Mon, 14 Sep 2026 09:07:35 +0100 [thread overview]
Message-ID: <178937325582.257763.3545375214126322609.b4-ty@kernel.org> (raw)
In-Reply-To: <20260826033803.475-1-jianping.li@oss.qualcomm.com>
On Wed, 26 Aug 2026 11:38:03 +0800, Jianping Li wrote:
> Allocating and freeing Audio PD memory from userspace is unsafe because
> the kernel cannot reliably determine when the DSP has finished using the
> memory. Userspace may free buffers while they are still in use by the DSP,
> and remote free requests cannot be safely trusted.
>
> Additionally, the current implementation allows userspace to repeatedly
> grow the Audio PD heap, but does not support shrinking it. This can lead
> to unbounded memory usage over time, effectively causing a memory leak.
>
> [...]
Applied, thanks!
[1/1] misc: fastrpc: Allocate entire reserved memory for Audio PD in probe
commit: 9981fbe599e80d0fa264b714ebf14d8d80d9790a
Best regards,
--
Srinivas Kandagatla <srini@kernel.org>
prev parent reply other threads:[~2026-09-14 8:07 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-26 3:38 Jianping Li
2026-09-01 11:01 ` Ekansh Gupta
2026-09-14 8:07 ` Srinivas Kandagatla [this message]
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