PCI: vmd: Make vmd_dev::cfg_lock a raw_spinlock_t type

The access to the PCI config space via pci_ops::read and pci_ops::write is
a low-level hardware access. The functions can be accessed with disabled
interrupts even on PREEMPT_RT. The pci_lock is a raw_spinlock_t for this
purpose.

A spinlock_t becomes a sleeping lock on PREEMPT_RT, so it cannot be
acquired with disabled interrupts. The vmd_dev::cfg_lock is accessed in
the same context as the pci_lock.

Make vmd_dev::cfg_lock a raw_spinlock_t type so it can be used with
interrupts disabled.

This was reported as:

  BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48
  Call Trace:
   rt_spin_lock+0x4e/0x130
   vmd_pci_read+0x8d/0x100 [vmd]
   pci_user_read_config_byte+0x6f/0xe0
   pci_read_config+0xfe/0x290
   sysfs_kf_bin_read+0x68/0x90

Signed-off-by: Ryo Takakura <[email protected]>
Tested-by: Luis Claudio R. Goncalves <[email protected]>
Acked-by: Luis Claudio R. Goncalves <[email protected]>
[bigeasy: reword commit message]
Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Tested-off-by: Luis Claudio R. Goncalves <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[kwilczynski: commit log]
Signed-off-by: Krzysztof Wilczyński <[email protected]>
[bhelgaas: add back report info from
https://lore.kernel.org/lkml/[email protected]/]
Signed-off-by: Bjorn Helgaas <[email protected]>

0 files changed, 0 insertions, 0 deletions