From: Gavin Shan <gwshan@linux.vnet.ibm.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: linux-pci@vger.kernel.org, mpe@ellerman.id.au,
bhelgaas@google.com, Gavin Shan <gwshan@linux.vnet.ibm.com>,
"# v4 . 8+" <stable@vger.kernel.org>
Subject: [PATCH 1/3] pci/hotplug/pnv-php: Remove WARN_ON() in pnv_php_put_slot()
Date: Thu, 16 Feb 2017 10:22:32 +1100 [thread overview]
Message-ID: <1487200954-14681-2-git-send-email-gwshan@linux.vnet.ibm.com> (raw)
In-Reply-To: <1487200954-14681-1-git-send-email-gwshan@linux.vnet.ibm.com>
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(-)
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);
--
2.7.4
next prev parent reply other threads:[~2017-02-15 23:23 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-15 23:22 [PATCH 0/3] pci/hotplug/pnv-php: More bug fixes Gavin Shan
2017-02-15 23:22 ` Gavin Shan [this message]
2017-02-16 4:46 ` [PATCH 1/3] pci/hotplug/pnv-php: Remove WARN_ON() in pnv_php_put_slot() Andrew Donnellan
2017-02-16 6:10 ` Vaibhav Jain
2017-02-19 11:33 ` [1/3] " Michael Ellerman
2017-02-15 23:22 ` [PATCH 2/3] pci/hotplug/pnv-php: Disable surprise hotplug capability on conflicts Gavin Shan
2017-02-16 4:31 ` Andrew Donnellan
2017-02-16 5:50 ` Gavin Shan
2017-02-16 6:11 ` Vaibhav Jain
2017-02-15 23:22 ` [PATCH 3/3] pci/hotplug/pnv-php: Disable MSI and PCI device properly Gavin Shan
2017-02-16 4:45 ` Andrew Donnellan
2017-02-16 14:09 ` [PATCH 0/3] pci/hotplug/pnv-php: More bug fixes Bjorn Helgaas
2017-02-16 22:38 ` Gavin Shan
2017-02-16 23:28 ` Bjorn Helgaas
2017-02-16 23:39 ` Gavin Shan
2017-02-17 11:13 ` Michael Ellerman
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