From: Vinod Koul <vkoul@kernel.org> To: "yukuai (C)" <yukuai3@huawei.com> Cc: Johan Hovold <johan@kernel.org>, mcoquelin.stm32@gmail.com, alexandre.torgue@foss.st.com, michal.simek@xilinx.com, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, yi.zhang@huawei.com Subject: Re: [PATCH 2/3] dmaengine: usb-dmac: Fix PM reference leak in usb_dmac_probe() Date: Tue, 6 Jul 2021 16:19:50 +0530 [thread overview] Message-ID: <YOQ1TufSjoXDJBBj@matsya> (raw) In-Reply-To: <c8fcdaa1-f053-47aa-2dad-521b8f34b8d1@huawei.com> On 05-07-21, 16:41, yukuai (C) wrote: > Hi, Vinod > > Are you still intrested in accepting this patch? - Please do not top post - yes, pls rebase and resend > On 2021/06/07 18:19, Vinod Koul wrote: > > On 07-06-21, 10:06, Johan Hovold wrote: > > > On Thu, Jun 03, 2021 at 04:39:08PM +0530, Vinod Koul wrote: > > > > On 31-05-21, 11:19, Johan Hovold wrote: > > > > > On Mon, May 31, 2021 at 02:27:34PM +0530, Vinod Koul wrote: > > > > > > On 31-05-21, 14:11, yukuai (C) wrote: > > > > > > > On 2021/05/31 12:00, Vinod Koul wrote: > > > > > > > > On 17-05-21, 16:18, Yu Kuai wrote: > > > > > > > > > pm_runtime_get_sync will increment pm usage counter even it failed. > > > > > > > > > Forgetting to putting operation will result in reference leak here. > > > > > > > > > Fix it by replacing it with pm_runtime_resume_and_get to keep usage > > > > > > > > > counter balanced. > > > > > > > > > Yes the rumtime_pm is disabled on failure here and the count would have > > > > > > no consequence... > > > > > > > > > > You should still balance the PM usage counter as it isn't reset for > > > > > example when reloading the driver. > > > > > > > > Should I driver trust that on load PM usage counter is balanced and not > > > > to be reset..? > > > > > > Not sure what you're asking here. But a driver should never leave the PM > > > usage counter unbalanced. > > > > Thinking about again, yes we should safely assume the counter is > > balanced when driver loads.. so unloading while balancing sounds better > > behaviour > > > > Thanks > > -- ~Vinod
WARNING: multiple messages have this Message-ID (diff)
From: Vinod Koul <vkoul@kernel.org> To: "yukuai (C)" <yukuai3@huawei.com> Cc: Johan Hovold <johan@kernel.org>, mcoquelin.stm32@gmail.com, alexandre.torgue@foss.st.com, michal.simek@xilinx.com, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, yi.zhang@huawei.com Subject: Re: [PATCH 2/3] dmaengine: usb-dmac: Fix PM reference leak in usb_dmac_probe() Date: Tue, 6 Jul 2021 16:19:50 +0530 [thread overview] Message-ID: <YOQ1TufSjoXDJBBj@matsya> (raw) In-Reply-To: <c8fcdaa1-f053-47aa-2dad-521b8f34b8d1@huawei.com> On 05-07-21, 16:41, yukuai (C) wrote: > Hi, Vinod > > Are you still intrested in accepting this patch? - Please do not top post - yes, pls rebase and resend > On 2021/06/07 18:19, Vinod Koul wrote: > > On 07-06-21, 10:06, Johan Hovold wrote: > > > On Thu, Jun 03, 2021 at 04:39:08PM +0530, Vinod Koul wrote: > > > > On 31-05-21, 11:19, Johan Hovold wrote: > > > > > On Mon, May 31, 2021 at 02:27:34PM +0530, Vinod Koul wrote: > > > > > > On 31-05-21, 14:11, yukuai (C) wrote: > > > > > > > On 2021/05/31 12:00, Vinod Koul wrote: > > > > > > > > On 17-05-21, 16:18, Yu Kuai wrote: > > > > > > > > > pm_runtime_get_sync will increment pm usage counter even it failed. > > > > > > > > > Forgetting to putting operation will result in reference leak here. > > > > > > > > > Fix it by replacing it with pm_runtime_resume_and_get to keep usage > > > > > > > > > counter balanced. > > > > > > > > > Yes the rumtime_pm is disabled on failure here and the count would have > > > > > > no consequence... > > > > > > > > > > You should still balance the PM usage counter as it isn't reset for > > > > > example when reloading the driver. > > > > > > > > Should I driver trust that on load PM usage counter is balanced and not > > > > to be reset..? > > > > > > Not sure what you're asking here. But a driver should never leave the PM > > > usage counter unbalanced. > > > > Thinking about again, yes we should safely assume the counter is > > balanced when driver loads.. so unloading while balancing sounds better > > behaviour > > > > Thanks > > -- ~Vinod _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-07-06 10:49 UTC|newest] Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-05-17 8:18 [PATCH 0/3] cleanup patches for PM reference leak Yu Kuai 2021-05-17 8:18 ` Yu Kuai 2021-05-17 8:18 ` [PATCH 1/3] dmaengine: stm32-mdma: fix PM reference leak in stm32_mdma_alloc_chan_resourc() Yu Kuai 2021-05-17 8:18 ` Yu Kuai 2021-05-31 4:03 ` Vinod Koul 2021-05-31 4:03 ` Vinod Koul 2021-05-17 8:18 ` [PATCH 2/3] dmaengine: usb-dmac: Fix PM reference leak in usb_dmac_probe() Yu Kuai 2021-05-17 8:18 ` Yu Kuai 2021-05-31 4:00 ` Vinod Koul 2021-05-31 4:00 ` Vinod Koul 2021-05-31 6:11 ` yukuai (C) 2021-05-31 6:11 ` yukuai (C) 2021-05-31 8:57 ` Vinod Koul 2021-05-31 8:57 ` Vinod Koul 2021-05-31 9:19 ` Johan Hovold 2021-05-31 9:19 ` Johan Hovold 2021-06-03 11:09 ` Vinod Koul 2021-06-03 11:09 ` Vinod Koul 2021-06-07 8:06 ` Johan Hovold 2021-06-07 8:06 ` Johan Hovold 2021-06-07 10:19 ` Vinod Koul 2021-06-07 10:19 ` Vinod Koul 2021-07-05 8:41 ` yukuai (C) 2021-07-05 8:41 ` yukuai (C) 2021-07-06 10:49 ` Vinod Koul [this message] 2021-07-06 10:49 ` Vinod Koul 2021-05-17 8:18 ` [PATCH 3/3] dmaengine: zynqmp_dma: Fix PM reference leak in zynqmp_dma_alloc_chan_resourc() Yu Kuai 2021-05-17 8:18 ` Yu Kuai 2021-05-31 4:03 ` Vinod Koul 2021-05-31 4:03 ` Vinod Koul 2021-05-29 9:13 ` [PATCH 0/3] cleanup patches for PM reference leak yukuai (C) 2021-05-29 9:13 ` yukuai (C)
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