[PATCH 6.1.y] s390/zcrypt: Enable AUTOSEL_DOM for CCA serialnr sysfs attribute

[Sasha Levin <sashal@kernel.org>]

From: Harald Freudenberger <freude@linux.ibm.com>

[ Upstream commit 598bbefa8032cc58b564a81d1ad68bd815c8dc0f ]

The serialnr sysfs attribute for CCA cards when queried always
used the default domain for sending the request down to the card.
If for any reason exactly this default domain is disabled then
the attribute code fails to retrieve the CCA info and the sysfs
entry shows an empty string. Works as designed but the serial
number is a card attribute and thus it does not matter which
domain is used for the query. So if there are other domains on
this card available, these could be used.

So extend the code to use AUTOSEL_DOM for the domain value to
address any online domain within the card for querying the cca
info and thus show the serialnr as long as there is one domain
usable regardless of the default domain setting.

Fixes: 8f291ebf3270 ("s390/zcrypt: enable card/domain autoselect on ep11 cprbs")
Suggested-by: Ingo Franzki <ifranzki@linux.ibm.com>
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Ingo Franzki <ifranzki@linux.ibm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
[ preserved zc->online as the fourth argument to cca_get_info() ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/s390/crypto/zcrypt_ccamisc.c | 12 +++++++-----
 drivers/s390/crypto/zcrypt_cex4.c    |  3 +--
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/s390/crypto/zcrypt_ccamisc.c b/drivers/s390/crypto/zcrypt_ccamisc.c
index 60ba20a133bed..a2cea4f4a6b85 100644
--- a/drivers/s390/crypto/zcrypt_ccamisc.c
+++ b/drivers/s390/crypto/zcrypt_ccamisc.c
@@ -1689,11 +1689,13 @@ static int fetch_cca_info(u16 cardnr, u16 domain, struct cca_info *ci)
 
 	memset(ci, 0, sizeof(*ci));
 
-	/* get first info from zcrypt device driver about this apqn */
-	rc = zcrypt_device_status_ext(cardnr, domain, &devstat);
-	if (rc)
-		return rc;
-	ci->hwtype = devstat.hwtype;
+	/* if specific domain given, fetch status and hw info for this apqn */
+	if (domain != AUTOSEL_DOM) {
+		rc = zcrypt_device_status_ext(cardnr, domain, &devstat);
+		if (rc)
+			return rc;
+		ci->hwtype = devstat.hwtype;
+	}
 
 	/* prep page for rule array and var array use */
 	pg = (u8 *)__get_free_page(GFP_KERNEL);
diff --git a/drivers/s390/crypto/zcrypt_cex4.c b/drivers/s390/crypto/zcrypt_cex4.c
index b03916b7538bc..3eb14af475f66 100644
--- a/drivers/s390/crypto/zcrypt_cex4.c
+++ b/drivers/s390/crypto/zcrypt_cex4.c
@@ -85,8 +85,7 @@ static ssize_t cca_serialnr_show(struct device *dev,
 
 	memset(&ci, 0, sizeof(ci));
 
-	if (ap_domain_index >= 0)
-		cca_get_info(ac->id, ap_domain_index, &ci, zc->online);
+	cca_get_info(ac->id, AUTOSEL_DOM, &ci, zc->online);
 
 	return scnprintf(buf, PAGE_SIZE, "%s\n", ci.serial);
 }
-- 
2.51.0