From: Keith Busch <keith.busch@intel.com> To: Bjorn Helgaas <bhelgaas@google.com> Cc: Alexander Gordeev <agordeev@redhat.com>, Matthew Wilcox <willy@linux.intel.com>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, linux-nvme@lists.infradead.org, "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org> Subject: Re: [PATCH v2 5/9] nvme: Fix invalid call to irq_set_affinity_hint() Date: Fri, 17 Jan 2014 15:01:10 -0700 (MST) [thread overview] Message-ID: <alpine.LRH.2.03.1401171419370.25844@AMR> (raw) In-Reply-To: <CAErSpo4g_xm4vZWZDgyjtJu+z5ARSerQLrtJ6W_peXv4bKwcgg@mail.gmail.com> On Fri, 17 Jan 2014, Bjorn Helgaas wrote: > On Fri, Jan 17, 2014 at 9:02 AM, Alexander Gordeev <agordeev@redhat.com> wrote: >> In case MSI-X and MSI initialization failed the function >> irq_set_affinity_hint() is called with uninitialized value >> in dev->entry[0].vector. This update fixes the issue. > > dev->entry[0].vector is initialized in nvme_dev_map(), and it's used > for free_irq() above the area of your patch, so I don't think this is > actually a bug, though it might be somewhat confusing. It is confusing, but there's a reason. :) We send a single command using legacy irq to discover how many msix vectors we want. The legacy entry needs to be set some time before calling request_irq in nvme_configure_admin_queue, but also within nvme_dev_start (for power-management). I don't think there's a place to set it that won't look odd when looking at nvme_setup_io_queues. I settled on 'nvme_dev_map' was because 'nvme_dev_unmap' invalidates the entries, so this seemed to provide some amount of symmetry. >> Signed-off-by: Alexander Gordeev <agordeev@redhat.com> >> --- >> drivers/block/nvme-core.c | 12 ++++++------ >> 1 files changed, 6 insertions(+), 6 deletions(-) >> >> diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c >> index 26d03fa..e292450 100644 >> --- a/drivers/block/nvme-core.c >> +++ b/drivers/block/nvme-core.c >> @@ -1790,15 +1790,15 @@ static int nvme_setup_io_queues(struct nvme_dev *dev) >> vecs = 32; >> for (;;) { >> result = pci_enable_msi_block(pdev, vecs); >> - if (result == 0) { >> - for (i = 0; i < vecs; i++) >> - dev->entry[i].vector = i + pdev->irq; >> - break; >> + if (result > 0) { >> + vecs = result; >> + continue; >> } else if (result < 0) { >> vecs = 1; >> - break; >> } >> - vecs = result; >> + for (i = 0; i < vecs; i++) >> + dev->entry[i].vector = i + pdev->irq; >> + break; >> } >> }
WARNING: multiple messages have this Message-ID (diff)
From: keith.busch@intel.com (Keith Busch) Subject: [PATCH v2 5/9] nvme: Fix invalid call to irq_set_affinity_hint() Date: Fri, 17 Jan 2014 15:01:10 -0700 (MST) [thread overview] Message-ID: <alpine.LRH.2.03.1401171419370.25844@AMR> (raw) In-Reply-To: <CAErSpo4g_xm4vZWZDgyjtJu+z5ARSerQLrtJ6W_peXv4bKwcgg@mail.gmail.com> On Fri, 17 Jan 2014, Bjorn Helgaas wrote: > On Fri, Jan 17, 2014@9:02 AM, Alexander Gordeev <agordeev@redhat.com> wrote: >> In case MSI-X and MSI initialization failed the function >> irq_set_affinity_hint() is called with uninitialized value >> in dev->entry[0].vector. This update fixes the issue. > > dev->entry[0].vector is initialized in nvme_dev_map(), and it's used > for free_irq() above the area of your patch, so I don't think this is > actually a bug, though it might be somewhat confusing. It is confusing, but there's a reason. :) We send a single command using legacy irq to discover how many msix vectors we want. The legacy entry needs to be set some time before calling request_irq in nvme_configure_admin_queue, but also within nvme_dev_start (for power-management). I don't think there's a place to set it that won't look odd when looking at nvme_setup_io_queues. I settled on 'nvme_dev_map' was because 'nvme_dev_unmap' invalidates the entries, so this seemed to provide some amount of symmetry. >> Signed-off-by: Alexander Gordeev <agordeev at redhat.com> >> --- >> drivers/block/nvme-core.c | 12 ++++++------ >> 1 files changed, 6 insertions(+), 6 deletions(-) >> >> diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c >> index 26d03fa..e292450 100644 >> --- a/drivers/block/nvme-core.c >> +++ b/drivers/block/nvme-core.c >> @@ -1790,15 +1790,15 @@ static int nvme_setup_io_queues(struct nvme_dev *dev) >> vecs = 32; >> for (;;) { >> result = pci_enable_msi_block(pdev, vecs); >> - if (result == 0) { >> - for (i = 0; i < vecs; i++) >> - dev->entry[i].vector = i + pdev->irq; >> - break; >> + if (result > 0) { >> + vecs = result; >> + continue; >> } else if (result < 0) { >> vecs = 1; >> - break; >> } >> - vecs = result; >> + for (i = 0; i < vecs; i++) >> + dev->entry[i].vector = i + pdev->irq; >> + break; >> } >> }
next prev parent reply other threads:[~2014-01-17 22:01 UTC|newest] Thread overview: 114+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-01-17 16:02 [PATCH v2 0/9] Phase out pci_enable_msi_block() Alexander Gordeev 2014-01-17 16:02 ` Alexander Gordeev 2014-01-17 16:02 ` Alexander Gordeev 2014-01-17 9:26 ` [PATCH 10/9] PCI/MSI: Undeprecate pci_enable_msi() Alexander Gordeev 2014-01-29 22:10 ` Bjorn Helgaas 2014-01-17 9:27 ` [PATCH 11/9] PCI/MSI: Phase out pci_enable_msi_block() Alexander Gordeev 2014-01-29 22:22 ` Bjorn Helgaas 2014-01-17 16:02 ` [PATCH v2 1/9] ahci: Fix broken fallback to single MSI mode Alexander Gordeev 2014-01-17 16:02 ` [PATCH v2 2/9] ahci: Use pci_enable_msi_range() Alexander Gordeev 2014-01-17 16:02 ` [PATCH v2 3/9] ipr: Get rid of superfluous call to pci_disable_msi/msix() Alexander Gordeev 2014-01-17 16:02 ` [PATCH v2 4/9] ipr: Use pci_enable_msi_range() and pci_enable_msix_range() Alexander Gordeev 2014-01-28 9:54 ` Alexander Gordeev 2014-01-28 15:28 ` Brian King 2014-01-29 13:26 ` Alexander Gordeev 2014-01-30 14:06 ` Alexander Gordeev 2014-01-30 14:09 ` [PATCH v2 1/2] ipr: Get rid of superfluous call to pci_disable_msi/msix() Alexander Gordeev 2014-02-03 15:20 ` Brian King 2014-01-30 14:10 ` [PATCH v2 2/2] ipr: Use pci_enable_msi_range() and pci_enable_msix_range() Alexander Gordeev 2014-02-03 15:22 ` Brian King 2014-02-24 8:12 ` [PATCH v2 4/9] " Alexander Gordeev 2014-02-26 15:02 ` Brian King 2014-01-17 16:02 ` [PATCH v2 5/9] nvme: Fix invalid call to irq_set_affinity_hint() Alexander Gordeev 2014-01-17 16:02 ` Alexander Gordeev 2014-01-17 19:40 ` Bjorn Helgaas 2014-01-17 19:40 ` Bjorn Helgaas 2014-01-17 22:01 ` Keith Busch [this message] 2014-01-17 22:01 ` Keith Busch 2014-01-20 8:38 ` Alexander Gordeev 2014-01-20 8:38 ` Alexander Gordeev 2014-01-20 8:40 ` [PATCH v3 6/9] nvme: Use pci_enable_msi_range() and pci_enable_msix_range() Alexander Gordeev 2014-01-20 8:40 ` Alexander Gordeev 2014-02-05 13:07 ` Alexander Gordeev 2014-02-05 13:07 ` Alexander Gordeev 2014-02-18 17:54 ` Keith Busch 2014-02-18 17:54 ` Keith Busch 2014-01-20 8:42 ` [PATCH] nvme: Cleanup nvme_dev_start() and fix IRQ leak Alexander Gordeev 2014-01-20 8:42 ` Alexander Gordeev 2014-01-20 22:48 ` Keith Busch 2014-01-20 22:48 ` Keith Busch 2014-01-21 10:03 ` Alexander Gordeev 2014-01-21 10:03 ` Alexander Gordeev 2014-01-21 10:06 ` [PATCH 1/2] Revert "NVMe: Disable admin queue on init failure" Alexander Gordeev 2014-01-21 10:06 ` Alexander Gordeev 2014-01-21 10:07 ` [PATCH 2/2] nvme: Cleanup nvme_dev_start() and fix IRQ leak Alexander Gordeev 2014-01-21 10:07 ` Alexander Gordeev 2014-01-21 19:06 ` Keith Busch 2014-01-21 19:06 ` Keith Busch 2014-01-20 8:43 ` [PATCH] nvme: Cleanup nvme_dev_start() Alexander Gordeev 2014-01-20 8:43 ` Alexander Gordeev 2014-01-20 16:41 ` Keith Busch 2014-01-20 16:41 ` Keith Busch 2014-01-17 16:02 ` [PATCH v2 6/9] nvme: Use pci_enable_msi_range() and pci_enable_msix_range() Alexander Gordeev 2014-01-17 16:02 ` Alexander Gordeev 2014-01-17 16:02 ` [PATCH v2 7/9] vfio: " Alexander Gordeev 2014-01-29 21:36 ` Bjorn Helgaas 2014-01-17 16:02 ` [PATCH v2 8/9] ath10k: Use pci_enable_msi_range() Alexander Gordeev 2014-01-17 16:02 ` Alexander Gordeev 2014-01-30 13:48 ` [PATCH 1/3] ath10k: Get rid of superfluous call to pci_disable_msi() Alexander Gordeev 2014-01-30 13:48 ` Alexander Gordeev 2014-02-04 18:32 ` Kalle Valo 2014-02-04 18:32 ` Kalle Valo 2014-02-04 19:09 ` Alexander Gordeev 2014-02-04 19:09 ` Alexander Gordeev 2014-02-05 8:21 ` Kalle Valo 2014-02-05 8:21 ` Kalle Valo 2014-02-05 8:50 ` Alexander Gordeev 2014-02-05 8:50 ` Alexander Gordeev 2014-02-05 8:54 ` Kalle Valo 2014-02-05 8:54 ` Kalle Valo 2014-02-12 0:31 ` Bjorn Helgaas 2014-02-12 0:31 ` Bjorn Helgaas 2014-02-12 13:38 ` Alexander Gordeev 2014-02-12 13:38 ` Alexander Gordeev 2014-02-12 19:28 ` Bjorn Helgaas 2014-02-12 19:28 ` Bjorn Helgaas 2014-02-12 21:30 ` Kalle Valo 2014-02-12 21:30 ` Kalle Valo 2014-02-12 21:40 ` Bjorn Helgaas 2014-02-12 21:40 ` Bjorn Helgaas 2014-02-13 10:29 ` Kalle Valo 2014-02-13 10:29 ` Kalle Valo 2014-02-13 13:18 ` Alexander Gordeev 2014-02-13 16:04 ` Kalle Valo 2014-02-13 16:04 ` Kalle Valo 2014-01-30 13:48 ` [PATCH 2/3] ath10k: Disable MSI in case IRQ configuration is unknown Alexander Gordeev 2014-01-30 13:48 ` Alexander Gordeev 2014-01-30 13:49 ` [PATCH v3 3/3] ath10k: Use pci_enable_msi_range() Alexander Gordeev 2014-01-30 13:49 ` Alexander Gordeev 2014-02-03 11:02 ` [PATCH v2 8/9] " Alexander Gordeev 2014-02-03 11:02 ` Alexander Gordeev 2014-01-17 16:02 ` [PATCH v2 9/9] wil6210: " Alexander Gordeev 2014-01-29 21:37 ` Bjorn Helgaas 2014-02-07 14:46 ` [PATCH] wil6210: Fix switch operator "missing break?" warning Alexander Gordeev 2014-02-10 10:54 ` Vladimir Kondratiev 2014-02-10 12:16 ` Alexander Gordeev 2014-02-11 1:32 ` Fengguang Wu 2014-01-17 21:00 ` [PATCH v2 0/9] Phase out pci_enable_msi_block() Bjorn Helgaas 2014-01-17 21:00 ` Bjorn Helgaas 2014-01-17 21:00 ` Bjorn Helgaas 2014-01-18 7:15 ` Alexander Gordeev 2014-01-18 7:15 ` Alexander Gordeev 2014-01-18 7:15 ` Alexander Gordeev 2014-01-18 14:38 ` Bjorn Helgaas 2014-01-18 14:38 ` Bjorn Helgaas 2014-01-18 14:38 ` Bjorn Helgaas 2014-01-18 14:59 ` Tejun Heo 2014-01-18 14:59 ` Tejun Heo 2014-01-18 14:59 ` Tejun Heo 2014-01-29 21:48 ` Bjorn Helgaas 2014-01-29 21:48 ` Bjorn Helgaas 2014-01-29 21:48 ` Bjorn Helgaas 2014-01-29 13:59 ` Alexander Gordeev 2014-01-29 13:59 ` Alexander Gordeev 2014-01-29 13:59 ` Alexander Gordeev
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