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| author | Emil Tantilov <emil.s.tantilov@intel.com> | 2017-01-07 00:59:08 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2017-02-03 22:42:38 +0300 |
| commit | 5b0948dfe138f0837699f46f5877f4f81c252dac (patch) | |
| tree | eb67c2325c5dea87be81c16ce19b872dd153ac6a /drivers/pci/pci.h | |
| parent | 7184f5b451cf3dc61de79091d235b5d2bba2782d (diff) | |
| download | linux-5b0948dfe138f0837699f46f5877f4f81c252dac.tar.xz | |
PCI: Lock each enable/disable num_vfs operation in sysfs
Enabling/disabling SRIOV via sysfs by echo-ing multiple values
simultaneously:
# echo 63 > /sys/class/net/ethX/device/sriov_numvfs&
# echo 63 > /sys/class/net/ethX/device/sriov_numvfs
# sleep 5
# echo 0 > /sys/class/net/ethX/device/sriov_numvfs&
# echo 0 > /sys/class/net/ethX/device/sriov_numvfs
results in the following bug:
kernel BUG at drivers/pci/iov.c:495!
invalid opcode: 0000 [#1] SMP
CPU: 1 PID: 8050 Comm: bash Tainted: G W 4.9.0-rc7-net-next #2092
RIP: 0010:[<ffffffff813b1647>]
[<ffffffff813b1647>] pci_iov_release+0x57/0x60
Call Trace:
[<ffffffff81391726>] pci_release_dev+0x26/0x70
[<ffffffff8155be6e>] device_release+0x3e/0xb0
[<ffffffff81365ee7>] kobject_cleanup+0x67/0x180
[<ffffffff81365d9d>] kobject_put+0x2d/0x60
[<ffffffff8155bc27>] put_device+0x17/0x20
[<ffffffff8139c08a>] pci_dev_put+0x1a/0x20
[<ffffffff8139cb6b>] pci_get_dev_by_id+0x5b/0x90
[<ffffffff8139cca5>] pci_get_subsys+0x35/0x40
[<ffffffff8139ccc8>] pci_get_device+0x18/0x20
[<ffffffff8139ccfb>] pci_get_domain_bus_and_slot+0x2b/0x60
[<ffffffff813b09e7>] pci_iov_remove_virtfn+0x57/0x180
[<ffffffff813b0b95>] pci_disable_sriov+0x65/0x140
[<ffffffffa00a1af7>] ixgbe_disable_sriov+0xc7/0x1d0 [ixgbe]
[<ffffffffa00a1e9d>] ixgbe_pci_sriov_configure+0x3d/0x170 [ixgbe]
[<ffffffff8139d28c>] sriov_numvfs_store+0xdc/0x130
...
RIP [<ffffffff813b1647>] pci_iov_release+0x57/0x60
Use the existing mutex lock to protect each enable/disable operation.
Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
CC: Alexander Duyck <alexander.h.duyck@intel.com>
Diffstat (limited to 'drivers/pci/pci.h')
| -rw-r--r-- | drivers/pci/pci.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index cb17db242f30..8dd38e69d6f2 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -270,7 +270,7 @@ struct pci_sriov { u16 driver_max_VFs; /* max num VFs driver supports */ struct pci_dev *dev; /* lowest numbered PF */ struct pci_dev *self; /* this PF */ - struct mutex lock; /* lock for VF bus */ + struct mutex lock; /* lock for setting sriov_numvfs in sysfs */ resource_size_t barsz[PCI_SRIOV_NUM_BARS]; /* VF BAR size */ }; |