linux-kernel - [PATCH] nvmet: fix mismatched serial

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Date:   Fri, 11 Dec 2020 14:54:56 +0800
From:   zhenwei pi <pizhenwei@...edance.com>
To:     hch@....de, sagi@...mberg.me, chaitanya.kulkarni@....com
Cc:     linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        pizhenwei@...edance.com
Subject: [PATCH] nvmet: fix mismatched serial

Target side uses 'bin2hex' to convert u64 serial number to a hex
string, saving serial number as be64 to keep right byte order.

Test on x86 server, config '0123456789abcdef' to 'attr_serial' on
target side, and run 'nvme id-ctrl /dev/nvme0' on initiator side,
then we can get the same SN string.

Signed-off-by: zhenwei pi <pizhenwei@...edance.com>
---
 drivers/nvme/target/configfs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index 37e1d7784e17..e7808a86ccef 100644
--- a/drivers/nvme/target/configfs.c
+++ b/drivers/nvme/target/configfs.c
@@ -997,7 +997,7 @@ static ssize_t nvmet_subsys_attr_serial_show(struct config_item *item,
 {
 	struct nvmet_subsys *subsys = to_subsys(item);
 
-	return snprintf(page, PAGE_SIZE, "%llx\n", subsys->serial);
+	return snprintf(page, PAGE_SIZE, "%llx\n", be64_to_cpu(subsys->serial));
 }
 
 static ssize_t nvmet_subsys_attr_serial_store(struct config_item *item,
@@ -1009,7 +1009,7 @@ static ssize_t nvmet_subsys_attr_serial_store(struct config_item *item,
 		return -EINVAL;
 
 	down_write(&nvmet_config_sem);
-	to_subsys(item)->serial = serial;
+	to_subsys(item)->serial = cpu_to_be64(serial);
 	up_write(&nvmet_config_sem);
 
 	return count;
-- 
2.25.1