kernel_optimize_test/drivers/pci
Logan Gunthorpe efbdc76960 PCI/switchtec: Fix init_completion race condition with poll_wait()
The call to init_completion() in mrpc_queue_cmd() can theoretically
race with the call to poll_wait() in switchtec_dev_poll().

  poll()			write()
    switchtec_dev_poll()   	  switchtec_dev_write()
      poll_wait(&s->comp.wait);      mrpc_queue_cmd()
			               init_completion(&s->comp)
				         init_waitqueue_head(&s->comp.wait)

To my knowledge, no one has hit this bug.

Fix this by using reinit_completion() instead of init_completion() in
mrpc_queue_cmd().

Fixes: 080b47def5 ("MicroSemi Switchtec management interface driver")

Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lkml.kernel.org/r/20200313183608.2646-1-logang@deltatee.com
2020-03-21 16:00:20 +01:00
..
controller PCI: brcmstb: Fix build on 32bit ARM platforms with older compilers 2020-02-27 08:06:20 -06:00
endpoint
hotplug pci/hotplug/pnv-php: Wrap warnings in macro 2020-01-23 21:31:17 +11:00
pcie PCI/AER: Initialize aer_fifo 2020-01-23 16:40:03 -06:00
switch PCI/switchtec: Fix init_completion race condition with poll_wait() 2020-03-21 16:00:20 +01:00
access.c
ats.c pci-v5.6-fixes-1 2020-02-06 14:17:38 +00:00
bus.c
ecam.c
host-bridge.c
iov.c
irq.c
Kconfig
Makefile
mmap.c
msi.c remove ioremap_nocache and devm_ioremap_nocache 2020-01-06 09:45:59 +01:00
of.c
p2pdma.c PCI/P2PDMA: Add Intel SkyLake-E to the whitelist 2019-12-10 15:15:51 -06:00
pci-acpi.c
pci-bridge-emul.c
pci-bridge-emul.h
pci-driver.c
pci-label.c
pci-mid.c
pci-pf-stub.c
pci-stub.c
pci-sysfs.c
pci.c IOMMU Updates for Linux v5.6 2020-02-05 17:49:54 +00:00
pci.h PCI: Fix pci_add_dma_alias() bitmask size 2019-12-18 12:21:16 -06:00
probe.c
proc.c proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
quirks.c pci-v5.6-changes 2020-01-31 14:48:54 -08:00
remove.c
rom.c
search.c Merge branch 'pci/host-vmd' 2020-01-29 17:00:02 -06:00
setup-bus.c PCI: Allow adjust_bridge_window() to shrink resource if necessary 2020-01-29 16:57:28 -06:00
setup-irq.c
setup-res.c
slot.c
syscall.c
vc.c
vpd.c
xen-pcifront.c