[PATCH v2 0/5] scsi: ufs: Fix device management timeouts and runtime PM errors

[PATCH v2 0/5] scsi: ufs: Fix device management timeouts and runtime PM errors

[Stanley Jhu]

This series fixes two problems in UFS core entry points that issue
device management commands or touch host registers.

Patch 1/5 restores the millisecond to jiffies conversion of device
management command timeouts. Since the timeout moved to rq->timeout,
a 1500 ms query timeout waits 6 s with CONFIG_HZ=250.

Patches 2/5 to 5/5 handle runtime PM resume errors. Several UFS core,
sysfs, BSG, hwmon, and debugfs entry points call ufshcd_rpm_get_sync()
before accessing host registers or issuing device management and UIC
commands, but ignore its return value.

ufshcd_rpm_get_sync() wraps pm_runtime_get_sync() on the UFS device
W-LUN and returns a negative errno when runtime resume of the W-LUN or
host controller fails, leaving the device or controller in
RPM_SUSPENDED.

Continuing after such a failure can access host registers or issue
commands while the device or controller is not known to be active,
while checking pm_runtime_get_sync() directly would leave
power.usage_count elevated unless balanced with
pm_runtime_put_noidle().

Add ufshcd_rpm_resume_and_get() around pm_runtime_resume_and_get() and
convert the 20 external and helper call sites to abort and propagate the
error when resuming the W-LUN fails. The three lifecycle call sites in
ufshcd_rpm_dev_flush_recheck_work(), ufshcd_wl_shutdown(), and
ufshcd_remove(), plus ufshcd_err_handling_prepare(), are intentionally
left unchanged.

Tested on QEMU ARM64 UFS (SDB and MCQ) with W-LUN runtime resume and
suspend failures via sysfs offline (no behavior change on suspend
failure) and GDB power.disable_depth=1 to make ufshcd_rpm_get_sync()
fail, and on SDB with a timed out query request.

Changes since v1:
- Drop the incorrect claim that a failed W-LUN runtime suspend
  latches power.runtime_error from the cover letter and commit
  messages. The PM core latches a runtime suspend error only if it
  is neither -EBUSY nor -EAGAIN, and in-tree UFS drivers fail W-LUN
  runtime suspend only with -EBUSY or -EAGAIN (Bart).
- Say in the cover letter how the series was tested.
- Describe each failing sequence in patches 2-5 step by step in
  time order, and drop the runtime PM disabled (-EACCES) scenario.

Link: https://lore.kernel.org/linux-scsi/20261025013446.345974-1-stanleyjhu@google.com/

Stanley Jhu (5):
  scsi: ufs: core: Restore jiffies conversion of device management
    timeouts
  scsi: ufs: core: Introduce ufshcd_rpm_resume_and_get() helper
  scsi: ufs: sysfs: Propagate runtime PM resume errors
  scsi: ufs: bsg: Abort ufs_bsg_request() when runtime resume fails
  scsi: ufs: hwmon, debugfs: Propagate runtime PM resume errors

 drivers/ufs/core/ufs-debugfs.c |  8 +++-
 drivers/ufs/core/ufs-hwmon.c   | 12 +++++-
 drivers/ufs/core/ufs-sysfs.c   | 67 +++++++++++++++++++++++++++-------
 drivers/ufs/core/ufs_bsg.c     |  4 +-
 drivers/ufs/core/ufshcd-priv.h |  5 +++
 drivers/ufs/core/ufshcd.c      |  9 +++--
 6 files changed, 84 insertions(+), 21 deletions(-)


base-commit: 503e6172fa74da6b4944ece458f5534681e51d21
-- 
2.56.0.307.g5fe7bd680c-goog

[PATCH v2 1/5] scsi: ufs: core: Restore jiffies conversion of device management timeouts

[Stanley Jhu]

Before commit 08b12cda6c44 ("scsi: ufs: core: Switch to
scsi_get_internal_cmd()"), ufshcd_wait_for_dev_cmd() converted the
millisecond timeout with msecs_to_jiffies() before waiting for the
command. That commit moved the timeout to the block layer and assigns
the millisecond value to rq->timeout as is, but rq->timeout is in
jiffies. A 1500 ms query timeout (QUERY_REQ_TIMEOUT_DEFAULT) becomes
6 s with CONFIG_HZ=250 and 15 s with CONFIG_HZ=100, and NOP_OUT_TIMEOUT
and ADVANCED_RPMB_REQ_TIMEOUT grow the same way.

Restore the conversion with msecs_to_jiffies().

Fixes: 08b12cda6c44 ("scsi: ufs: core: Switch to scsi_get_internal_cmd()")
Cc: stable@vger.kernel.org # v6.19+
Signed-off-by: Stanley Jhu <stanleyjhu@google.com>
---
 drivers/ufs/core/ufshcd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index fd52deb72d21..68a98cde5812 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -3390,7 +3390,7 @@ static int ufshcd_issue_dev_cmd(struct ufs_hba *hba, struct scsi_cmnd *cmd,
 	struct request *rq = scsi_cmd_to_rq(cmd);
 	blk_status_t sts;
 
-	rq->timeout = timeout;
+	rq->timeout = msecs_to_jiffies(timeout);
 	sts = blk_execute_rq(rq, true);
 	if (sts != BLK_STS_OK)
 		return blk_status_to_errno(sts);
-- 
2.56.0.313.g2479322e68-goog

[PATCH v2 2/5] scsi: ufs: core: Introduce ufshcd_rpm_resume_and_get() helper

[Stanley Jhu]

ufshcd_clkscale_enable_store() and ufshcd_auto_hibern8_update() resume
the UFS device W-LUN with ufshcd_rpm_get_sync() and ignore its return
value.

For clkscale_enable:

1. The W-LUN is runtime suspended and clock scaling is disabled.
2. User space writes 1 to clkscale_enable.
3. ufshcd_clkscale_enable_store() calls ufshcd_rpm_get_sync().
4. The W-LUN runtime resume fails and the W-LUN stays suspended.
5. ufshcd_rpm_get_sync() returns a negative errno, which is ignored.
6. ufshcd_clkscale_enable_store() enables clock scaling and resumes
   devfreq while the W-LUN is still suspended.

For auto_hibern8:

1. The W-LUN starts a runtime suspend.
2. User space writes a new value to auto_hibern8.
3. ufshcd_auto_hibern8_update() sees that the W-LUN is not yet
   suspended and calls ufshcd_rpm_get_sync().
4. ufshcd_rpm_get_sync() waits for the runtime suspend to finish and
   then runs the W-LUN runtime resume.
5. The W-LUN runtime resume fails and the W-LUN stays suspended.
6. ufshcd_rpm_get_sync() returns a negative errno, which is ignored.
7. ufshcd_auto_hibern8_update() writes REG_AUTO_HIBERNATE_IDLE_TIMER
   while the W-LUN is still suspended.

Add ufshcd_rpm_resume_and_get() wrapping pm_runtime_resume_and_get() so
failed resumes drop the usage reference automatically, and return early
in ufshcd_clkscale_enable_store() and ufshcd_auto_hibern8_update() when
it fails.

Fixes: b294ff3e3449 ("scsi: ufs: core: Enable power management for wlun")
Cc: stable@vger.kernel.org
Signed-off-by: Stanley Jhu <stanleyjhu@google.com>
---
 drivers/ufs/core/ufshcd-priv.h | 5 +++++
 drivers/ufs/core/ufshcd.c      | 7 +++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
index e55c2a02c1f5..99f654b79035 100644
--- a/drivers/ufs/core/ufshcd-priv.h
+++ b/drivers/ufs/core/ufshcd-priv.h
@@ -388,6 +388,11 @@ static inline int ufshcd_rpm_get_sync(struct ufs_hba *hba)
 	return pm_runtime_get_sync(&hba->ufs_device_wlun->sdev_gendev);
 }
 
+static inline int ufshcd_rpm_resume_and_get(struct ufs_hba *hba)
+{
+	return pm_runtime_resume_and_get(&hba->ufs_device_wlun->sdev_gendev);
+}
+
 static inline int ufshcd_rpm_get_if_active(struct ufs_hba *hba)
 {
 	return pm_runtime_get_if_active(&hba->ufs_device_wlun->sdev_gendev);
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 68a98cde5812..5972e85d279e 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -1864,7 +1864,9 @@ static ssize_t ufshcd_clkscale_enable_store(struct device *dev,
 	if (value == hba->clk_scaling.is_enabled)
 		goto out;
 
-	ufshcd_rpm_get_sync(hba);
+	err = ufshcd_rpm_resume_and_get(hba);
+	if (err)
+		goto out;
 	ufshcd_hold(hba);
 
 	hba->clk_scaling.is_enabled = value;
@@ -4792,7 +4794,8 @@ void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit)
 
 	WRITE_ONCE(hba->ahit, ahit);
 	if (!pm_runtime_suspended(&hba->ufs_device_wlun->sdev_gendev)) {
-		ufshcd_rpm_get_sync(hba);
+		if (ufshcd_rpm_resume_and_get(hba))
+			return;
 		ufshcd_hold(hba);
 		/*
 		 * Serialize with the host driver's AHIT control. Skip the
-- 
2.56.0.313.g2479322e68-goog

[PATCH v2 3/5] scsi: ufs: sysfs: Propagate runtime PM resume errors

[Stanley Jhu]

All 14 ufshcd_rpm_get_sync() callers in ufs-sysfs.c resume the UFS
device W-LUN and ignore the return value. For example, for a UFS
descriptor read:

1. The W-LUN is runtime suspended.
2. User space reads a UFS descriptor attribute in sysfs.
3. ufs_sysfs_read_desc_param() calls ufshcd_rpm_get_sync().
4. The W-LUN runtime resume fails and the W-LUN stays suspended.
5. ufshcd_rpm_get_sync() returns a negative errno, which is ignored.
6. ufs_sysfs_read_desc_param() sends a query UPIU while the W-LUN is
   still suspended.

The other sysfs callers follow the same sequence. They send other
query UPIUs, or read a host register in ufshcd_read_hci_reg().

Switch all 14 sysfs callers to ufshcd_rpm_resume_and_get() and return
the error after releasing any held buffer and hba->host_sem.

Fixes: aef80fd1da32 ("scsi: ufs: sysfs: Resume the proper SCSI device")
Fixes: b9d104465a6c ("scsi: ufs: Prepare to add HCI capabilities sysfs")
Fixes: 600edc6620a4 ("scsi: ufs: sysfs: Make max_number_of_rtt read-write")
Fixes: 6c4148ce7cc1 ("scsi: ufs: wb: Add explicit flush sysfs attribute")
Fixes: 500d4b742e0c ("scsi: ufs: core: Add WB buffer resize support")
Fixes: ae7795a8c258 ("scsi: ufs: core: Add HID support")
Fixes: 1fd2e77b8897 ("scsi: ufs: core: Add device level exception support")
Cc: stable@vger.kernel.org # needs "scsi: ufs: core: Introduce ufshcd_rpm_resume_and_get() helper"
Signed-off-by: Stanley Jhu <stanleyjhu@google.com>
---
 drivers/ufs/core/ufs-sysfs.c | 67 ++++++++++++++++++++++++++++--------
 1 file changed, 53 insertions(+), 14 deletions(-)

diff --git a/drivers/ufs/core/ufs-sysfs.c b/drivers/ufs/core/ufs-sysfs.c
index cf49ad0258e1..19b62cf52410 100644
--- a/drivers/ufs/core/ufs-sysfs.c
+++ b/drivers/ufs/core/ufs-sysfs.c
@@ -250,13 +250,19 @@ EXPORT_SYMBOL_GPL(ufshcd_us_to_ahit);
 
 static int ufshcd_read_hci_reg(struct ufs_hba *hba, u32 *val, unsigned int reg)
 {
+	int ret;
+
 	down(&hba->host_sem);
 	if (!ufshcd_is_user_access_allowed(hba)) {
 		up(&hba->host_sem);
 		return -EBUSY;
 	}
 
-	ufshcd_rpm_get_sync(hba);
+	ret = ufshcd_rpm_resume_and_get(hba);
+	if (ret) {
+		up(&hba->host_sem);
+		return ret;
+	}
 	ufshcd_hold(hba);
 	*val = ufshcd_readl(hba, reg);
 	ufshcd_release(hba);
@@ -350,7 +356,9 @@ static ssize_t wb_on_store(struct device *dev, struct device_attribute *attr,
 		goto out;
 	}
 
-	ufshcd_rpm_get_sync(hba);
+	res = ufshcd_rpm_resume_and_get(hba);
+	if (res)
+		goto out;
 	res = ufshcd_wb_toggle(hba, wb_enable);
 	ufshcd_rpm_put_sync(hba);
 out:
@@ -421,7 +429,9 @@ static ssize_t enable_wb_buf_flush_store(struct device *dev,
 		goto out;
 	}
 
-	ufshcd_rpm_get_sync(hba);
+	res = ufshcd_rpm_resume_and_get(hba);
+	if (res)
+		goto out;
 	res = ufshcd_wb_toggle_buf_flush(hba, enable_wb_buf_flush);
 	ufshcd_rpm_put_sync(hba);
 
@@ -490,7 +500,9 @@ static ssize_t wb_resize_enable_store(struct device *dev,
 		goto out;
 	}
 
-	ufshcd_rpm_get_sync(hba);
+	res = ufshcd_rpm_resume_and_get(hba);
+	if (res)
+		goto out;
 	res = ufshcd_wb_set_resize_en(hba, mode);
 	ufshcd_rpm_put_sync(hba);
 
@@ -598,7 +610,9 @@ static ssize_t device_lvl_exception_id_show(struct device *dev,
 	if (hba->dev_info.wspecversion < 0x410)
 		return -EOPNOTSUPP;
 
-	ufshcd_rpm_get_sync(hba);
+	err = ufshcd_rpm_resume_and_get(hba);
+	if (err)
+		return err;
 	err = ufshcd_query_attr_qword(hba, UPIU_QUERY_OPCODE_READ_ATTR,
 				      QUERY_ATTR_IDN_DEV_LVL_EXCEPTION_ID,
 				      0, 0, &exception_id);
@@ -1101,7 +1115,9 @@ static ssize_t ufs_sysfs_read_desc_param(struct ufs_hba *hba,
 		goto out;
 	}
 
-	ufshcd_rpm_get_sync(hba);
+	ret = ufshcd_rpm_resume_and_get(hba);
+	if (ret)
+		goto out;
 	ret = ufshcd_read_desc_param(hba, desc_id, desc_index,
 				param_offset, desc_buf, param_size);
 	ufshcd_rpm_put_sync(hba);
@@ -1482,7 +1498,12 @@ static ssize_t _name##_show(struct device *dev,				\
 		up(&hba->host_sem);					\
 		return -ENOMEM;						\
 	}								\
-	ufshcd_rpm_get_sync(hba);					\
+	ret = ufshcd_rpm_resume_and_get(hba);				\
+	if (ret) {							\
+		kfree(desc_buf);					\
+		up(&hba->host_sem);					\
+		return ret;						\
+	}								\
 	ret = ufshcd_query_descriptor_retry(hba,			\
 		UPIU_QUERY_OPCODE_READ_DESC, QUERY_DESC_IDN_DEVICE,	\
 		0, 0, desc_buf, &desc_len);				\
@@ -1548,7 +1569,9 @@ static ssize_t _name##_show(struct device *dev,				\
 	}								\
 	if (ufshcd_is_wb_flags(QUERY_FLAG_IDN##_uname))			\
 		index = ufshcd_wb_get_query_index(hba);			\
-	ufshcd_rpm_get_sync(hba);					\
+	ret = ufshcd_rpm_resume_and_get(hba);				\
+	if (ret)							\
+		goto out;						\
 	ret = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_READ_FLAG,	\
 		QUERY_FLAG_IDN##_uname, index, &flag);			\
 	ufshcd_rpm_put_sync(hba);					\
@@ -1608,7 +1631,9 @@ static ssize_t max_number_of_rtt_show(struct device *dev,
 		return -EBUSY;
 	}
 
-	ufshcd_rpm_get_sync(hba);
+	ret = ufshcd_rpm_resume_and_get(hba);
+	if (ret)
+		goto out;
 	ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR,
 		QUERY_ATTR_IDN_MAX_NUM_OF_RTT, 0, 0, &rtt);
 	ufshcd_rpm_put_sync(hba);
@@ -1648,7 +1673,9 @@ static ssize_t max_number_of_rtt_store(struct device *dev,
 		goto out;
 	}
 
-	ufshcd_rpm_get_sync(hba);
+	ret = ufshcd_rpm_resume_and_get(hba);
+	if (ret)
+		goto out;
 
 	memflags = memalloc_noio_save();
 	shost_for_each_device(sdev, hba->host)
@@ -1700,7 +1727,11 @@ static int wb_read_resize_attrs(struct ufs_hba *hba,
 	}
 
 	index = ufshcd_wb_get_query_index(hba);
-	ufshcd_rpm_get_sync(hba);
+	ret = ufshcd_rpm_resume_and_get(hba);
+	if (ret) {
+		up(&hba->host_sem);
+		return ret;
+	}
 	ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR,
 			idn, index, 0, attr_val);
 	ufshcd_rpm_put_sync(hba);
@@ -1760,7 +1791,9 @@ static ssize_t _name##_show(struct device *dev,				\
 	}								\
 	if (ufshcd_is_wb_attrs(QUERY_ATTR_IDN##_uname))			\
 		index = ufshcd_wb_get_query_index(hba);			\
-	ufshcd_rpm_get_sync(hba);					\
+	ret = ufshcd_rpm_resume_and_get(hba);				\
+	if (ret)							\
+		goto out;						\
 	if (ufshcd_is_qword_attr(QUERY_ATTR_IDN##_uname))		\
 		ret = ufshcd_query_attr_qword(hba,			\
 			UPIU_QUERY_OPCODE_READ_ATTR,			\
@@ -1848,7 +1881,11 @@ static int hid_query_attr(struct ufs_hba *hba, enum query_opcode opcode,
 		return -EBUSY;
 	}
 
-	ufshcd_rpm_get_sync(hba);
+	ret = ufshcd_rpm_resume_and_get(hba);
+	if (ret) {
+		up(&hba->host_sem);
+		return ret;
+	}
 	ret = ufshcd_query_attr(hba, opcode, idn, 0, 0, attr_val);
 	ufshcd_rpm_put_sync(hba);
 
@@ -2121,7 +2158,9 @@ static ssize_t dyn_cap_needed_attribute_show(struct device *dev,
 		goto out;
 	}
 
-	ufshcd_rpm_get_sync(hba);
+	ret = ufshcd_rpm_resume_and_get(hba);
+	if (ret)
+		goto out;
 	ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR,
 		QUERY_ATTR_IDN_DYN_CAP_NEEDED, lun, 0, &value);
 	ufshcd_rpm_put_sync(hba);
-- 
2.56.0.313.g2479322e68-goog

[PATCH v2 4/5] scsi: ufs: bsg: Abort ufs_bsg_request() when runtime resume fails

[Stanley Jhu]

ufs_bsg_request() resumes the UFS device W-LUN with
ufshcd_rpm_get_sync() and ignores its return value:

1. The W-LUN is runtime suspended.
2. User space submits a BSG request.
3. ufs_bsg_request() calls ufshcd_rpm_get_sync().
4. The W-LUN runtime resume fails and the W-LUN stays suspended.
5. ufshcd_rpm_get_sync() returns a negative errno, which is ignored.
6. ufs_bsg_request() dispatches the BSG command while the W-LUN is
   still suspended.

Use ufshcd_rpm_resume_and_get() and jump to out_complete on error so
the BSG job is completed via bsg_job_done() with the failure code
without dropping an unacquired runtime PM reference.

Fixes: b294ff3e3449 ("scsi: ufs: core: Enable power management for wlun")
Cc: stable@vger.kernel.org # needs "scsi: ufs: core: Introduce ufshcd_rpm_resume_and_get() helper"
Signed-off-by: Stanley Jhu <stanleyjhu@google.com>
---
 drivers/ufs/core/ufs_bsg.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufs_bsg.c b/drivers/ufs/core/ufs_bsg.c
index baf6ae917d36..8df1a2c6abf6 100644
--- a/drivers/ufs/core/ufs_bsg.c
+++ b/drivers/ufs/core/ufs_bsg.c
@@ -150,7 +150,9 @@ static int ufs_bsg_request(struct bsg_job *job)
 		goto out_complete;
 	}
 
-	ufshcd_rpm_get_sync(hba);
+	ret = ufshcd_rpm_resume_and_get(hba);
+	if (ret)
+		goto out_complete;
 
 	msgcode = bsg_request->msgcode;
 	switch (msgcode) {
-- 
2.56.0.313.g2479322e68-goog

[PATCH v2 5/5] scsi: ufs: hwmon, debugfs: Propagate runtime PM resume errors

[Stanley Jhu]

ufs_hwmon_read(), ufs_hwmon_write(), and ufs_debugfs_get_user_access()
resume the UFS device W-LUN with ufshcd_rpm_get_sync() and ignore its
return value. For example, for a hwmon temperature read:

1. The W-LUN is runtime suspended.
2. User space reads temp1_input of the UFS hwmon device.
3. ufs_hwmon_read() calls ufshcd_rpm_get_sync().
4. The W-LUN runtime resume fails and the W-LUN stays suspended.
5. ufshcd_rpm_get_sync() returns a negative errno, which is ignored.
6. ufs_hwmon_read() sends an attribute query UPIU while the W-LUN is
   still suspended.

ufs_hwmon_write() and the debugfs writers that use
ufs_debugfs_get_user_access() (exception_event_mask and tx_eq_ctrl)
follow the same sequence.

Convert all three call sites to ufshcd_rpm_resume_and_get() and
release hba->host_sem before returning the error, ahead of
__acquire(ufs_debugfs) in ufs_debugfs_get_user_access().

Fixes: b294ff3e3449 ("scsi: ufs: core: Enable power management for wlun")
Fixes: e88e2d32200a ("scsi: ufs: core: Probe for temperature notification support")
Fixes: adbabdcf0db0 ("scsi: ufs: core: Add support to retrain TX Equalization via debugfs")
Cc: stable@vger.kernel.org # needs "scsi: ufs: core: Introduce ufshcd_rpm_resume_and_get() helper"
Signed-off-by: Stanley Jhu <stanleyjhu@google.com>
---
 drivers/ufs/core/ufs-debugfs.c |  8 +++++++-
 drivers/ufs/core/ufs-hwmon.c   | 12 ++++++++++--
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/ufs/core/ufs-debugfs.c b/drivers/ufs/core/ufs-debugfs.c
index 9f83628f3e2c..44a1a9692324 100644
--- a/drivers/ufs/core/ufs-debugfs.c
+++ b/drivers/ufs/core/ufs-debugfs.c
@@ -70,12 +70,18 @@ token_context_lock(ufs_debugfs);
 static int ufs_debugfs_get_user_access(struct ufs_hba *hba)
 	__cond_acquires(0, ufs_debugfs)
 {
+	int err;
+
 	down(&hba->host_sem);
 	if (!ufshcd_is_user_access_allowed(hba)) {
 		up(&hba->host_sem);
 		return -EBUSY;
 	}
-	ufshcd_rpm_get_sync(hba);
+	err = ufshcd_rpm_resume_and_get(hba);
+	if (err) {
+		up(&hba->host_sem);
+		return err;
+	}
 	__acquire(ufs_debugfs);
 	return 0;
 }
diff --git a/drivers/ufs/core/ufs-hwmon.c b/drivers/ufs/core/ufs-hwmon.c
index aa0b60a0ee8a..2b9673d92573 100644
--- a/drivers/ufs/core/ufs-hwmon.c
+++ b/drivers/ufs/core/ufs-hwmon.c
@@ -61,7 +61,11 @@ static int ufs_hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32
 		return -EBUSY;
 	}
 
-	ufshcd_rpm_get_sync(hba);
+	err = ufshcd_rpm_resume_and_get(hba);
+	if (err) {
+		up(&hba->host_sem);
+		return err;
+	}
 
 	switch (attr) {
 	case hwmon_temp_enable:
@@ -113,7 +117,11 @@ static int ufs_hwmon_write(struct device *dev, enum hwmon_sensor_types type, u32
 		return -EBUSY;
 	}
 
-	ufshcd_rpm_get_sync(hba);
+	err = ufshcd_rpm_resume_and_get(hba);
+	if (err) {
+		up(&hba->host_sem);
+		return err;
+	}
 
 	if (val == 1)
 		err = ufshcd_update_ee_usr_mask(hba, MASK_EE_URGENT_TEMP, 0);
-- 
2.56.0.313.g2479322e68-goog

Re: [PATCH v2 0/5] scsi: ufs: Fix device management timeouts and runtime PM errors

[Bart Van Assche]

On 10/29/26 12:08 AM, Stanley Jhu wrote:
> This series fixes two problems in UFS core entry points that issue
> device management commands or touch host registers.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>

Re: [PATCH v2 0/5] scsi: ufs: Fix device management timeouts and runtime PM errors

[Peter Wang]

On Thu, 2026-10-29 at 15:08 +0800, Stanley Jhu wrote:
> This series fixes two problems in UFS core entry points that issue
> device management commands or touch host registers.
> 
> Patch 1/5 restores the millisecond to jiffies conversion of device
> management command timeouts. Since the timeout moved to rq->timeout,
> a 1500 ms query timeout waits 6 s with CONFIG_HZ=250.
> 
> Patches 2/5 to 5/5 handle runtime PM resume errors. Several UFS core,
> sysfs, BSG, hwmon, and debugfs entry points call
> ufshcd_rpm_get_sync()
> before accessing host registers or issuing device management and UIC
> commands, but ignore its return value.
> 
> ufshcd_rpm_get_sync() wraps pm_runtime_get_sync() on the UFS device
> W-LUN and returns a negative errno when runtime resume of the W-LUN
> or
> host controller fails, leaving the device or controller in
> RPM_SUSPENDED.
> 
> Continuing after such a failure can access host registers or issue
> commands while the device or controller is not known to be active,
> while checking pm_runtime_get_sync() directly would leave
> power.usage_count elevated unless balanced with
> pm_runtime_put_noidle().
> 
> Add ufshcd_rpm_resume_and_get() around pm_runtime_resume_and_get()
> and
> convert the 20 external and helper call sites to abort and propagate
> the
> error when resuming the W-LUN fails. The three lifecycle call sites
> in
> ufshcd_rpm_dev_flush_recheck_work(), ufshcd_wl_shutdown(), and
> ufshcd_remove(), plus ufshcd_err_handling_prepare(), are
> intentionally
> left unchanged.
> 
> Tested on QEMU ARM64 UFS (SDB and MCQ) with W-LUN runtime resume and
> suspend failures via sysfs offline (no behavior change on suspend
> failure) and GDB power.disable_depth=1 to make ufshcd_rpm_get_sync()
> fail, and on SDB with a timed out query request.
> 
> Changes since v1:
> - Drop the incorrect claim that a failed W-LUN runtime suspend
>   latches power.runtime_error from the cover letter and commit
>   messages. The PM core latches a runtime suspend error only if it
>   is neither -EBUSY nor -EAGAIN, and in-tree UFS drivers fail W-LUN
>   runtime suspend only with -EBUSY or -EAGAIN (Bart).
> - Say in the cover letter how the series was tested.
> - Describe each failing sequence in patches 2-5 step by step in
>   time order, and drop the runtime PM disabled (-EACCES) scenario.
> 
> Link:
> https://lore.kernel.org/linux-scsi/20261025013446.345974-1-stanleyjhu@google.com/
>  
> 
> Stanley Jhu (5):
>   scsi: ufs: core: Restore jiffies conversion of device management
>     timeouts
>   scsi: ufs: core: Introduce ufshcd_rpm_resume_and_get() helper
>   scsi: ufs: sysfs: Propagate runtime PM resume errors
>   scsi: ufs: bsg: Abort ufs_bsg_request() when runtime resume fails
>   scsi: ufs: hwmon, debugfs: Propagate runtime PM resume errors
> 
>  drivers/ufs/core/ufs-debugfs.c |  8 +++-
>  drivers/ufs/core/ufs-hwmon.c   | 12 +++++-
>  drivers/ufs/core/ufs-sysfs.c   | 67 +++++++++++++++++++++++++++-----
> --
>  drivers/ufs/core/ufs_bsg.c     |  4 +-
>  drivers/ufs/core/ufshcd-priv.h |  5 +++
>  drivers/ufs/core/ufshcd.c      |  9 +++--
>  6 files changed, 84 insertions(+), 21 deletions(-)
> 
> 
> base-commit: 503e6172fa74da6b4944ece458f5534681e51d21

For the series:
Reviewed-by: Peter Wang <peter.wang@mediatek.com>