From: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
To: linuxppc-dev@lists.ozlabs.org,
Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Cc: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>,
Andrew Donnellan <andrew.donnellan@au1.ibm.com>,
Christophe Lombard <christophe_lombard@fr.ibm.com>,
Philippe Bergheaud <philippe.bergheaud@fr.ibm.com>,
"Alastair D'Silva" <alastair@au1.ibm.com>
Subject: [PATCH] cxl: Check if vphb exists before iterating over AFU devices
Date: Wed, 22 Nov 2017 11:16:15 +0530 [thread overview]
Message-ID: <20171122054615.18092-1-vaibhav@linux.vnet.ibm.com> (raw)
During an eeh a kernel-oops is reported if no vPHB to allocated to the
AFU. This happens as during AFU init, an error in creation of vPHB is
a non-fatal error. Hence afu->phb should always be checked for NULL
before iterating over it for the virtual AFU pci devices.
This patch fixes the kenel-oops by adding a NULL pointer check for
afu->phb before it is dereferenced.
Signed-off-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
---
drivers/misc/cxl/pci.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
index bb7fd3f4edab..80ac40cdc31b 100644
--- a/drivers/misc/cxl/pci.c
+++ b/drivers/misc/cxl/pci.c
@@ -2265,6 +2265,9 @@ static pci_ers_result_t cxl_pci_slot_reset(struct pci_dev *pdev)
if (cxl_afu_select_best_mode(afu))
goto err;
+ if (afu->phb == NULL)
+ continue;
+
list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) {
/* Reset the device context.
* TODO: make this less disruptive
@@ -2327,6 +2330,9 @@ static void cxl_pci_resume(struct pci_dev *pdev)
for (i = 0; i < adapter->slices; i++) {
afu = adapter->afu[i];
+ if (afu->phb != NULL)
+ continue;
+
list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) {
if (afu_dev->driver && afu_dev->driver->err_handler &&
afu_dev->driver->err_handler->resume)
--
2.14.3
next reply other threads:[~2017-11-22 5:47 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-22 5:46 Vaibhav Jain [this message]
2017-11-22 6:47 ` [PATCH] cxl: Check if vphb exists before iterating over AFU devices Andrew Donnellan
2017-11-22 7:27 ` Vaibhav Jain
2017-12-20 9:37 Vaibhav Jain
2017-12-20 17:03 ` Greg KH
2017-12-21 4:05 ` Vaibhav Jain
2017-12-21 4:06 Vaibhav Jain
2017-12-21 8:03 ` Greg KH
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20171122054615.18092-1-vaibhav@linux.vnet.ibm.com \
--to=vaibhav@linux.vnet.ibm.com \
--cc=alastair@au1.ibm.com \
--cc=andrew.donnellan@au1.ibm.com \
--cc=christophe_lombard@fr.ibm.com \
--cc=fbarrat@linux.vnet.ibm.com \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=philippe.bergheaud@fr.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).