# git rev-parse -q --verify 78e7b15e17ac175e7eed9e21c6f92d03d3b0a6fa^{commit}
78e7b15e17ac175e7eed9e21c6f92d03d3b0a6fa
already have revision, skipping fetch
# git checkout -q -f -B kisskb 78e7b15e17ac175e7eed9e21c6f92d03d3b0a6fa
# git clean -qxdf
# < git log -1
# commit 78e7b15e17ac175e7eed9e21c6f92d03d3b0a6fa
# Author: Radu Rendec <radu.rendec@gmail.com>
# Date:   Tue Nov 27 22:20:48 2018 -0500
# 
#     powerpc/msi: Fix NULL pointer access in teardown code
#     
#     The arch_teardown_msi_irqs() function assumes that controller ops
#     pointers were already checked in arch_setup_msi_irqs(), but this
#     assumption is wrong: arch_teardown_msi_irqs() can be called even when
#     arch_setup_msi_irqs() returns an error (-ENOSYS).
#     
#     This can happen in the following scenario:
#       - msi_capability_init() calls pci_msi_setup_msi_irqs()
#       - pci_msi_setup_msi_irqs() returns -ENOSYS
#       - msi_capability_init() notices the error and calls free_msi_irqs()
#       - free_msi_irqs() calls pci_msi_teardown_msi_irqs()
#     
#     This is easier to see when CONFIG_PCI_MSI_IRQ_DOMAIN is not set and
#     pci_msi_setup_msi_irqs() and pci_msi_teardown_msi_irqs() are just
#     aliases to arch_setup_msi_irqs() and arch_teardown_msi_irqs().
#     
#     The call to free_msi_irqs() upon pci_msi_setup_msi_irqs() failure
#     seems legit, as it does additional cleanup; e.g.
#     list_del(&entry->list) and kfree(entry) inside free_msi_irqs() do
#     happen (MSI descriptors are allocated before pci_msi_setup_msi_irqs()
#     is called and need to be cleaned up if that fails).
#     
#     Fixes: 6b2fd7efeb88 ("PCI/MSI/PPC: Remove arch_msi_check_device()")
#     Cc: stable@vger.kernel.org # v3.18+
#     Signed-off-by: Radu Rendec <radu.rendec@gmail.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/br-sparc64-full-2016.08-613-ge98b4dd/bin/sparc64-linux-gcc --version
# < git log --format=%s --max-count=1 78e7b15e17ac175e7eed9e21c6f92d03d3b0a6fa
# < make -s -j 80 ARCH=sparc64 O=/kisskb/build/powerpc-fixes_sparc64-defconfig_sparc64 CROSS_COMPILE=/opt/cross/kisskb/br-sparc64-full-2016.08-613-ge98b4dd/bin/sparc64-linux-  defconfig
# make -s -j 80 ARCH=sparc64 O=/kisskb/build/powerpc-fixes_sparc64-defconfig_sparc64 CROSS_COMPILE=/opt/cross/kisskb/br-sparc64-full-2016.08-613-ge98b4dd/bin/sparc64-linux-  
<stdin>:1335:2: warning: #warning syscall rseq not implemented [-Wcpp]
WARNING: EXPORT symbol "_mcount" [vmlinux] version generation failed, symbol will not be versioned.
WARNING: EXPORT symbol "_mcount" [vmlinux] version generation failed, symbol will not be versioned.
  kernel: arch/sparc/boot/image is ready
  kernel: arch/sparc/boot/zImage is ready
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_sparc64-defconfig_sparc64
# Build took: 0:01:09.451644