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([2001:250:5800:1000::f280]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3925ff6658bsm5116933a91.14.2026.08.07.23.53.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 07 Aug 2026 23:53:35 -0700 (PDT) From: Guangshuo Li To: Hadar Gat , Olivia Mackall , Herbert Xu , linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Guangshuo Li , stable@vger.kernel.org Subject: [PATCH] hwrng: cctrng: fix usage_count leak when autosuspend_delay is negative Date: Sat, 8 Aug 2026 14:41:45 +0800 Message-ID: <20260808064145.2615010-1-lgs201920130244@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" cc_trng_pm_init() calls pm_runtime_use_autosuspend(), but cc_trng_pm_fini() does not call the matching pm_runtime_dont_use_autosuspend() before disabling runtime PM. If the autosuspend delay is set to a negative value while autosuspend is enabled, the runtime PM core increments usage_count to prevent runtime suspend. Without calling pm_runtime_dont_use_autosuspend() during teardown, this reference is not dropped and usage_count remains unbalanced. Add the missing pm_runtime_dont_use_autosuspend() call before disabling runtime PM. This issue was found by manual code inspection. Fixes: a583ed310bb6 ("hwrng: cctrng - introduce Arm CryptoCell driver") Cc: stable@vger.kernel.org Signed-off-by: Guangshuo Li --- drivers/char/hw_random/cctrng.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/char/hw_random/cctrng.c b/drivers/char/hw_random/cctrn= g.c index a5be9258037f..bed4b9876d09 100644 --- a/drivers/char/hw_random/cctrng.c +++ b/drivers/char/hw_random/cctrng.c @@ -126,6 +126,7 @@ static void cc_trng_pm_fini(struct cctrng_drvdata *drvd= ata) { struct device *dev =3D &(drvdata->pdev->dev); =20 + pm_runtime_dont_use_autosuspend(dev); pm_runtime_disable(dev); } =20 --=20 2.43.0