linux-kernel - [PATCH] scsi: ufs: core: Handle sentinel value for dHIDAvailableSize

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Message-ID: <20251226042825epcms2p6f02ba12fa97ff4a69c00f6fb9ff55603@epcms2p6>
Date: Fri, 26 Dec 2025 13:28:25 +0900
From: Keoseong Park <keosung.park@...sung.com>
To: ALIM AKHTAR <alim.akhtar@...sung.com>, "avri.altman@....com"
	<avri.altman@....com>, "bvanassche@....org" <bvanassche@....org>,
	"James.Bottomley@...senPartnership.com"
	<James.Bottomley@...senPartnership.com>, "martin.petersen@...cle.com"
	<martin.petersen@...cle.com>, "peter.wang@...iatek.com"
	<peter.wang@...iatek.com>, "tanghuan@...o.com" <tanghuan@...o.com>, Keoseong
	Park <keosung.park@...sung.com>, "zhongqiu.han@....qualcomm.com"
	<zhongqiu.han@....qualcomm.com>, "quic_nguyenb@...cinc.com"
	<quic_nguyenb@...cinc.com>, "liu.song13@....com.cn" <liu.song13@....com.cn>,
	"chullee@...gle.com" <chullee@...gle.com>
CC: "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] scsi: ufs: core: Handle sentinel value for
 dHIDAvailableSize

JEDEC UFS spec defines 0xFFFFFFFF for dHIDAvailableSize as indicating no
valid fragmented size information. Returning the raw value can mislead
userspace. Return -ENODATA instead when the value is unavailable.

Signed-off-by: Keoseong Park <keosung.park@...sung.com>
---
 drivers/ufs/core/ufs-sysfs.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/ufs/core/ufs-sysfs.c b/drivers/ufs/core/ufs-sysfs.c
index b33f8656edb5..1017dd3ae5d3 100644
--- a/drivers/ufs/core/ufs-sysfs.c
+++ b/drivers/ufs/core/ufs-sysfs.c
@@ -1847,6 +1847,7 @@ static ssize_t defrag_trigger_store(struct device *dev,
 
 static DEVICE_ATTR_WO(defrag_trigger);
 
+#define UFS_HID_AVAILABLE_SIZE_INVALID 0xFFFFFFFFU
 static ssize_t fragmented_size_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
@@ -1859,6 +1860,9 @@ static ssize_t fragmented_size_show(struct device *dev,
 	if (ret)
 		return ret;
 
+	if (value == UFS_HID_AVAILABLE_SIZE_INVALID)
+		return -ENODATA;
+
 	return sysfs_emit(buf, "%u\n", value);
 }
 
-- 
2.25.1