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s390/qeth: fix SETIP command handling 

[ Upstream commit 1c5b2216fb ]

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: 5b54e16f1a ("qeth: do not spin for SETIP ip assist command")
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Julian Wiedmann 2018-02-09 11:03:50 +01:00 committed by Greg Kroah-Hartman
parent 8d072588de
commit 3c07187111
2 changed files with 13 additions and 6 deletions
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5
drivers/s390/net/qeth_core.h
View File

@ -592,6 +592,11 @@ 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
*/

14
drivers/s390/net/qeth_core_main.c
View File

@ -2050,7 +2050,7 @@ int qeth_send_control_data(struct qeth_card *card, int len,
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");
@ -2077,10 +2077,13 @@ int qeth_send_control_data(struct qeth_card *card, int len,
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");
@ -2105,9 +2108,8 @@ int qeth_send_control_data(struct qeth_card *card, int len,
/* 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;