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[S390] zcrypt: fix request timeout handling

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Under very high load zcrypt requests may timeout while waiting on the
request queue. Modify zcrypt that timeouts are based on crypto adapter
responses. A timeout occurs only if a crypto adapter does not respond
within a given time frame to sumitted requests.

Signed-off-by: Ralph Wuerthner <rwuerthn@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Ralph Wuerthner
2007-07-10 11:24:19 +02:00
committed by Martin Schwidefsky
parent 987ad70a4d
commit af512ed0f8
6 changed files with 140 additions and 90 deletions
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27
drivers/s390/crypto/zcrypt_cex2a.c
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@@ -70,6 +70,7 @@ static struct ap_driver zcrypt_cex2a_driver = {
.remove = zcrypt_cex2a_remove,
.receive = zcrypt_cex2a_receive,
.ids = zcrypt_cex2a_ids,
.request_timeout = CEX2A_CLEANUP_TIME,
};
/**
@@ -306,18 +307,13 @@ static long zcrypt_cex2a_modexpo(struct zcrypt_device *zdev,
goto out_free;
init_completion(&work);
ap_queue_message(zdev->ap_dev, &ap_msg);
rc = wait_for_completion_interruptible_timeout(
&work, CEX2A_CLEANUP_TIME);
if (rc > 0)
rc = wait_for_completion_interruptible(&work);
if (rc == 0)
rc = convert_response(zdev, &ap_msg, mex->outputdata,
mex->outputdatalength);
else {
/* Signal pending or message timed out. */
else
/* Signal pending. */
ap_cancel_message(zdev->ap_dev, &ap_msg);
if (rc == 0)
/* Message timed out. */
rc = -ETIME;
}
out_free:
kfree(ap_msg.message);
return rc;
@@ -348,18 +344,13 @@ static long zcrypt_cex2a_modexpo_crt(struct zcrypt_device *zdev,
goto out_free;
init_completion(&work);
ap_queue_message(zdev->ap_dev, &ap_msg);
rc = wait_for_completion_interruptible_timeout(
&work, CEX2A_CLEANUP_TIME);
if (rc > 0)
rc = wait_for_completion_interruptible(&work);
if (rc == 0)
rc = convert_response(zdev, &ap_msg, crt->outputdata,
crt->outputdatalength);
else {
/* Signal pending or message timed out. */
else
/* Signal pending. */
ap_cancel_message(zdev->ap_dev, &ap_msg);
if (rc == 0)
/* Message timed out. */
rc = -ETIME;
}
out_free:
kfree(ap_msg.message);
return rc;