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[68.147.0.187]) by smtp.gmail.com with ESMTPSA id n52sm435888pfv.13.2021.04.06.16.47.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Apr 2021 16:47:49 -0700 (PDT) Date: Tue, 6 Apr 2021 17:47:47 -0600 From: Mathieu Poirier To: Suman Anna Cc: Bjorn Andersson , Grzegorz Jaszczyk , Jan Kiszka , Vignesh Raghavendra , Lokesh Vutla , linux-remoteproc@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 3/3] remoteproc: pru: Fix and cleanup firmware interrupt mapping logic Message-ID: <20210406234747.GC330882@xps15> References: <20210323223839.17464-1-s-anna@ti.com> <20210323223839.17464-4-s-anna@ti.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210323223839.17464-4-s-anna@ti.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210407_004751_980521_856A14DE X-CRM114-Status: GOOD ( 25.65 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Mar 23, 2021 at 05:38:39PM -0500, Suman Anna wrote: > The PRU firmware interrupt mappings are configured and unconfigured in > .start() and .stop() callbacks respectively using the variables 'evt_count' > and a 'mapped_irq' pointer. These variables are modified only during these > callbacks but are not re-initialized/reset properly during unwind or > failure paths. These stale values caused a kernel crash while stopping a > PRU remoteproc running a different firmware with no events on a subsequent > run after a previous run that was running a firmware with events. > > Fix this crash by ensuring that the evt_count is 0 and the mapped_irq > pointer is set to NULL in pru_dispose_irq_mapping(). Also, reset these > variables properly during any failures in the .start() callback. While > at this, the pru_dispose_irq_mapping() callsites are all made to look > the same, moving any conditional logic to inside the function. > > Fixes: c75c9fdac66e ("remoteproc: pru: Add support for PRU specific interrupt configuration") > Reported-by: Vignesh Raghavendra > Signed-off-by: Suman Anna > --- > drivers/remoteproc/pru_rproc.c | 12 +++++++++--- > 1 file changed, 9 insertions(+), 3 deletions(-) > > diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c > index 87b43976c51b..5df19acb90ed 100644 > --- a/drivers/remoteproc/pru_rproc.c > +++ b/drivers/remoteproc/pru_rproc.c > @@ -266,12 +266,17 @@ static void pru_rproc_create_debug_entries(struct rproc *rproc) > > static void pru_dispose_irq_mapping(struct pru_rproc *pru) > { > - while (pru->evt_count--) { > + if (!pru->mapped_irq) > + return; > + > + while (pru->evt_count) { > + pru->evt_count--; > if (pru->mapped_irq[pru->evt_count] > 0) > irq_dispose_mapping(pru->mapped_irq[pru->evt_count]); > } > > kfree(pru->mapped_irq); > + pru->mapped_irq = NULL; > } > > /* > @@ -324,6 +329,8 @@ static int pru_handle_intrmap(struct rproc *rproc) > of_node_put(parent); > if (!irq_parent) { > kfree(pru->mapped_irq); > + pru->mapped_irq = NULL; > + pru->evt_count = 0; Patch 1/3 introduced a check on @parent that doesn't free pru->mapped_irq. I would also expect that error path to do the same has what is done here. And looking further up I see the error path for !pru->mapped_irq doesn't set pru->evt_count to zero. Thanks, Mathieu > return -ENODEV; > } > > @@ -398,8 +405,7 @@ static int pru_rproc_stop(struct rproc *rproc) > pru_control_write_reg(pru, PRU_CTRL_CTRL, val); > > /* dispose irq mapping - new firmware can provide new mapping */ > - if (pru->mapped_irq) > - pru_dispose_irq_mapping(pru); > + pru_dispose_irq_mapping(pru); > > return 0; > } > -- > 2.30.1 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel