From: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> To: Sagar Dharia <sdharia-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> Cc: gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org, bp-l3A5Bk7waGM@public.gmane.org, poeschel-Xtl8qvBWbHwb1SvskN2V4Q@public.gmane.org, treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org, gong.chen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org, andreas.noever-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, alan-VuQAYsv1563Yd54FQh9/CA@public.gmane.org, mathieu.poirier-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, daniel-/w4YWyX8dFk@public.gmane.org, oded.gabbay-5C7GfCeVMHo@public.gmane.org, jkosina-AlSwsSmVLrQ@public.gmane.org, sharon.dvir1-MQgwKvJRKlGYZoqfULhbRA@public.gmane.org, joe-6d6DIl74uiNBDgjK7y7TUQ@public.gmane.org, davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org, james.hogan-1AXoQHu6uovQT0dZR+AlfA@public.gmane.org, michael.opdenacker-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org, daniel.thompson-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, pawel.moll-5wv7dgnIgG8@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org, galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, kheitke-hxvC4TZJLZFWk0Htik3J/w@public.gmane.org, mlocke-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, agross-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, linux-arm-msm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Subject: Re: [PATCH V4 4/6] slim: qcom: Add Qualcomm Slimbus controller driver Date: Sat, 5 Mar 2016 14:23:15 +0900 [thread overview] Message-ID: <20160305052315.GE18327@sirena.org.uk> (raw) In-Reply-To: <1454784265-5194-5-git-send-email-sdharia-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> [-- Attachment #1: Type: text/plain, Size: 1901 bytes --] On Sat, Feb 06, 2016 at 11:44:23AM -0700, Sagar Dharia wrote: > > +if SLIMBUS > +config SLIM_QCOM_CTRL > + tristate "Qualcomm Slimbus Manager Component" > + depends on SLIMBUS > + default n > + help n is the default. > +static irqreturn_t msm_slim_interrupt(int irq, void *d) > +{ > + struct msm_slim_ctrl *dev = d; > + u32 stat = readl_relaxed(dev->base + MGR_INT_STAT); > + int err = 0; > + if (stat & MGR_INT_TX_MSG_SENT || stat & MGR_INT_TX_NACKED_2) { > + if (stat & MGR_INT_RX_MSG_RCVD) { > + } > + /** > + * All interrupts are handled: complex RX messages requiring more work > + * are queued to work-queue, others are handled above > + */ > + return IRQ_HANDLED; This unconditionally returns IRQ_HANDLED even if no interrupts were flagged. This will break if the interrupt gets shared in some hardware design or if something goes wrong with the hardware. > + ret = devm_request_irq(&pdev->dev, dev->irq, msm_slim_interrupt, > + IRQF_TRIGGER_HIGH, "msm_slim_irq", dev); > + if (ret) { > + dev_err(&pdev->dev, "request IRQ failed\n"); > + goto err_request_irq_failed; > + } Are you sure this is safe and we don't deallocate things the interrupt handler uses before we disable the interrupt? > + ret = clk_prepare_enable(hclk); > + if (ret) > + goto err_hclk_enable_failed; > + > + ret = clk_prepare_enable(rclk); > + if (ret) > + goto err_rclk_enable_failed; The remove path doesn't disable these. > + /* Register with framework before enabling frame, clock */ > + ret = slim_register_controller(&dev->ctrl); > + if (ret) { > + dev_err(dev->dev, "error adding controller\n"); > + goto err_ctrl_failed; > + } Should we have a devm_ version of slim_register_controller()? I'd also expect this to be the last thing we do in probe, things may start using the device before we've finished initializing it. [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 473 bytes --]
WARNING: multiple messages have this Message-ID (diff)
From: Mark Brown <broonie@kernel.org> To: Sagar Dharia <sdharia@codeaurora.org> Cc: gregkh@linuxfoundation.org, bp@suse.de, poeschel@lemonage.de, treding@nvidia.com, gong.chen@linux.intel.com, andreas.noever@gmail.com, alan@linux.intel.com, mathieu.poirier@linaro.org, daniel@ffwll.ch, oded.gabbay@amd.com, jkosina@suse.cz, sharon.dvir1@mail.huji.ac.il, joe@perches.com, davem@davemloft.net, james.hogan@imgtec.com, michael.opdenacker@free-electrons.com, daniel.thompson@linaro.org, robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, kheitke@audience.com, mlocke@codeaurora.org, agross@codeaurora.org, linux-arm-msm@vger.kernel.org Subject: Re: [PATCH V4 4/6] slim: qcom: Add Qualcomm Slimbus controller driver Date: Sat, 5 Mar 2016 14:23:15 +0900 [thread overview] Message-ID: <20160305052315.GE18327@sirena.org.uk> (raw) In-Reply-To: <1454784265-5194-5-git-send-email-sdharia@codeaurora.org> [-- Attachment #1: Type: text/plain, Size: 1901 bytes --] On Sat, Feb 06, 2016 at 11:44:23AM -0700, Sagar Dharia wrote: > > +if SLIMBUS > +config SLIM_QCOM_CTRL > + tristate "Qualcomm Slimbus Manager Component" > + depends on SLIMBUS > + default n > + help n is the default. > +static irqreturn_t msm_slim_interrupt(int irq, void *d) > +{ > + struct msm_slim_ctrl *dev = d; > + u32 stat = readl_relaxed(dev->base + MGR_INT_STAT); > + int err = 0; > + if (stat & MGR_INT_TX_MSG_SENT || stat & MGR_INT_TX_NACKED_2) { > + if (stat & MGR_INT_RX_MSG_RCVD) { > + } > + /** > + * All interrupts are handled: complex RX messages requiring more work > + * are queued to work-queue, others are handled above > + */ > + return IRQ_HANDLED; This unconditionally returns IRQ_HANDLED even if no interrupts were flagged. This will break if the interrupt gets shared in some hardware design or if something goes wrong with the hardware. > + ret = devm_request_irq(&pdev->dev, dev->irq, msm_slim_interrupt, > + IRQF_TRIGGER_HIGH, "msm_slim_irq", dev); > + if (ret) { > + dev_err(&pdev->dev, "request IRQ failed\n"); > + goto err_request_irq_failed; > + } Are you sure this is safe and we don't deallocate things the interrupt handler uses before we disable the interrupt? > + ret = clk_prepare_enable(hclk); > + if (ret) > + goto err_hclk_enable_failed; > + > + ret = clk_prepare_enable(rclk); > + if (ret) > + goto err_rclk_enable_failed; The remove path doesn't disable these. > + /* Register with framework before enabling frame, clock */ > + ret = slim_register_controller(&dev->ctrl); > + if (ret) { > + dev_err(dev->dev, "error adding controller\n"); > + goto err_ctrl_failed; > + } Should we have a devm_ version of slim_register_controller()? I'd also expect this to be the last thing we do in probe, things may start using the device before we've finished initializing it. [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 473 bytes --]
next prev parent reply other threads:[~2016-03-05 5:23 UTC|newest] Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-02-06 18:44 [PATCH V4 0/6] Introduce framework for SLIMbus device drivers Sagar Dharia 2016-02-06 18:44 ` Sagar Dharia [not found] ` <1454784265-5194-1-git-send-email-sdharia-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> 2016-02-06 18:44 ` [PATCH V4 1/6] SLIMbus: Device management on SLIMbus Sagar Dharia 2016-02-06 18:44 ` Sagar Dharia [not found] ` <1454784265-5194-2-git-send-email-sdharia-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> 2016-03-05 5:01 ` Mark Brown 2016-03-05 5:01 ` Mark Brown 2016-02-06 18:44 ` [PATCH V4 2/6] of/slimbus: OF helper for SLIMbus Sagar Dharia 2016-02-08 20:24 ` Rob Herring 2016-02-06 18:44 ` [PATCH V4 3/6] slimbus: Add messaging APIs to slimbus framework Sagar Dharia 2016-03-05 5:13 ` Mark Brown 2016-02-06 18:44 ` [PATCH V4 4/6] slim: qcom: Add Qualcomm Slimbus controller driver Sagar Dharia 2016-02-08 20:26 ` Rob Herring [not found] ` <1454784265-5194-5-git-send-email-sdharia-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> 2016-03-05 5:23 ` Mark Brown [this message] 2016-03-05 5:23 ` Mark Brown 2016-04-15 16:17 ` Sagar Dharia 2016-04-18 9:19 ` Mark Brown 2016-04-18 22:42 ` Sagar Dharia 2016-02-06 18:44 ` [PATCH V4 5/6] slimbus: Add support for 'clock-pause' feature Sagar Dharia 2016-02-06 18:44 ` [PATCH V4 6/6] slim: qcom: Add runtime-pm support using clock-pause feature Sagar Dharia 2016-03-05 5:29 ` Mark Brown 2016-03-05 5:31 ` [PATCH V4 0/6] Introduce framework for SLIMbus device drivers Mark Brown
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