| Message ID | 1487200954-14681-2-git-send-email-gwshan@linux.vnet.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On 16/02/17 10:22, Gavin Shan wrote: > 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>
Andrew Donnellan <andrew.donnellan@au1.ibm.com> writes: >> 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>
On Wed, 2017-02-15 at 23:22:32 UTC, Gavin Shan wrote: > 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> Series applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/36c7c9da40c408a71e5e6bfe12e57d cheers
diff --git a/drivers/pci/hotplug/pnv_php.c b/drivers/pci/hotplug/pnv_php.c index 63cd9f3..da1bbf3 100644 --- a/drivers/pci/hotplug/pnv_php.c +++ b/drivers/pci/hotplug/pnv_php.c @@ -76,7 +76,7 @@ static void pnv_php_free_slot(struct kref *kref) static inline void pnv_php_put_slot(struct pnv_php_slot *php_slot) { - if (WARN_ON(!php_slot)) + if (!php_slot) return; kref_put(&php_slot->kref, pnv_php_free_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> --- drivers/pci/hotplug/pnv_php.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)