pci/hotplug/pnv-php: Remove WARN_ON() in pnv_php_put_slot()
The WARN_ON() causes unnecessary backtrace when putting the parent
slot, which is likely to be NULL.
WARNING: CPU: 2 PID: 1071 at drivers/pci/hotplug/pnv_php.c:85 \
pnv_php_release+0xcc/0x150 [pnv_php]
:
Call Trace:
[
c0000003bc007c10] [
d00000000ad613c4] pnv_php_release+0x144/0x150 [pnv_php]
[
c0000003bc007c40] [
c0000000006641d8] pci_hp_deregister+0x238/0x330
[
c0000003bc007cd0] [
d00000000ad61440] pnv_php_unregister_one+0x70/0xa0 [pnv_php]
[
c0000003bc007d10] [
d00000000ad614c0] pnv_php_unregister+0x50/0x80 [pnv_php]
[
c0000003bc007d40] [
d00000000ad61e84] pnv_php_exit+0x50/0xcb4 [pnv_php]
[
c0000003bc007d70] [
c00000000019499c] SyS_delete_module+0x1fc/0x2a0
[
c0000003bc007e30] [
c00000000000b184] system_call+0x38/0xe0
Cc: <stable@vger.kernel.org> # v4.8+
Fixes:
66725152fb9f ("PCI/hotplug: PowerPC PowerNV PCI hotplug driver")
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Tested-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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