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[109.49.32.45]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-427f935933csm81735615e9.7.2024.07.25.08.21.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 Jul 2024 08:21:10 -0700 (PDT) From: Rui Miguel Silva To: Matthias Fend , Laurent Pinchart , Martin Kepplinger , Purism Kernel Team , Mauro Carvalho Chehab , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam Cc: linux-media@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] media: imx-mipi-csis: avoid logging while holding spinlock In-Reply-To: <20240723060909.534584-1-matthias.fend@emfend.at> References: <20240723060909.534584-1-matthias.fend@emfend.at> Date: Thu, 25 Jul 2024 16:21:09 +0100 Message-ID: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain Hey Matthias, Many thanks for the patch. Matthias Fend writes: > Refactor mipi_csis_log_counters() to prevent calling dev_info() while > IRQs are disabled. This reduces crucial IRQs off time to a bare minimum. > > Signed-off-by: Matthias Fend LGTM Reviewed-by: Rui Miguel Silva Cheers, Rui > --- > drivers/media/platform/nxp/imx-mipi-csis.c | 9 ++++++--- > 1 file changed, 6 insertions(+), 3 deletions(-) > > diff --git a/drivers/media/platform/nxp/imx-mipi-csis.c b/drivers/media/platform/nxp/imx-mipi-csis.c > index f49b06978f14..0c34d316ed29 100644 > --- a/drivers/media/platform/nxp/imx-mipi-csis.c > +++ b/drivers/media/platform/nxp/imx-mipi-csis.c > @@ -857,18 +857,21 @@ static void mipi_csis_log_counters(struct mipi_csis_device *csis, bool non_error > { > unsigned int num_events = non_errors ? MIPI_CSIS_NUM_EVENTS > : MIPI_CSIS_NUM_EVENTS - 8; > + unsigned int counters[MIPI_CSIS_NUM_EVENTS]; > unsigned long flags; > unsigned int i; > > spin_lock_irqsave(&csis->slock, flags); > + for (i = 0; i < num_events; ++i) > + counters[i] = csis->events[i].counter; > + spin_unlock_irqrestore(&csis->slock, flags); > > for (i = 0; i < num_events; ++i) { > - if (csis->events[i].counter > 0 || csis->debug.enable) > + if (counters[i] > 0 || csis->debug.enable) > dev_info(csis->dev, "%s events: %d\n", > csis->events[i].name, > - csis->events[i].counter); > + counters[i]); > } > - spin_unlock_irqrestore(&csis->slock, flags); > } > > static int mipi_csis_dump_regs(struct mipi_csis_device *csis) > -- > 2.25.1