This is a note to let you know that I've just added the patch titled
s390/qeth: fix SETIP command handling
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
s390-qeth-fix-setip-command-handling.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Mar 8 10:42:32 PST 2018
From: Julian Wiedmann <jwi@xxxxxxxxxxxxxxxxxx>
Date: Fri, 9 Feb 2018 11:03:50 +0100
Subject: s390/qeth: fix SETIP command handling
From: Julian Wiedmann <jwi@xxxxxxxxxxxxxxxxxx>
[ Upstream commit 1c5b2216fbb973a9410e0b06389740b5c1289171 ]
send_control_data() applies some special handling to SETIP v4 IPA
commands. But current code parses *all* command types for the SETIP
command code. Limit the command code check to IPA commands.
Fixes: 5b54e16f1a54 ("qeth: do not spin for SETIP ip assist command")
Signed-off-by: Julian Wiedmann <jwi@xxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/s390/net/qeth_core.h | 5 +++++
drivers/s390/net/qeth_core_main.c | 14 ++++++++------
2 files changed, 13 insertions(+), 6 deletions(-)
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -593,6 +593,11 @@ struct qeth_cmd_buffer {
void (*callback) (struct qeth_channel *, struct qeth_cmd_buffer *);
};
+static inline struct qeth_ipa_cmd *__ipa_cmd(struct qeth_cmd_buffer *iob)
+{
+ return (struct qeth_ipa_cmd *)(iob->data + IPA_PDU_HEADER_SIZE);
+}
+
/**
* definition of a qeth channel, used for read and write
*/
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -2023,7 +2023,7 @@ int qeth_send_control_data(struct qeth_c
unsigned long flags;
struct qeth_reply *reply = NULL;
unsigned long timeout, event_timeout;
- struct qeth_ipa_cmd *cmd;
+ struct qeth_ipa_cmd *cmd = NULL;
QETH_CARD_TEXT(card, 2, "sendctl");
@@ -2050,10 +2050,13 @@ int qeth_send_control_data(struct qeth_c
while (atomic_cmpxchg(&card->write.irq_pending, 0, 1)) ;
qeth_prepare_control_data(card, len, iob);
- if (IS_IPA(iob->data))
+ if (IS_IPA(iob->data)) {
+ cmd = __ipa_cmd(iob);
event_timeout = QETH_IPA_TIMEOUT;
- else
+ } else {
event_timeout = QETH_TIMEOUT;
+ }
+
timeout = jiffies + event_timeout;
QETH_CARD_TEXT(card, 6, "noirqpnd");
@@ -2078,9 +2081,8 @@ int qeth_send_control_data(struct qeth_c
/* we have only one long running ipassist, since we can ensure
process context of this command we can sleep */
- cmd = (struct qeth_ipa_cmd *)(iob->data+IPA_PDU_HEADER_SIZE);
- if ((cmd->hdr.command == IPA_CMD_SETIP) &&
- (cmd->hdr.prot_version == QETH_PROT_IPV4)) {
+ if (cmd && cmd->hdr.command == IPA_CMD_SETIP &&
+ cmd->hdr.prot_version == QETH_PROT_IPV4) {
if (!wait_event_timeout(reply->wait_q,
atomic_read(&reply->received), event_timeout))
goto time_err;
Patches currently in stable-queue which might be from jwi@xxxxxxxxxxxxxxxxxx are
queue-3.18/s390-qeth-fix-setip-command-handling.patch
queue-3.18/s390-qeth-fix-ipa-command-submission-race.patch