[PATCH v5 1/2] scsi: ufs: Fix a possible NULL pointer issue
From: Can Guo <hidden>
Date: 2021-01-14 03:14:52
Also in:
linux-mediatek, linux-scsi, lkml
Subsystem:
scsi subsystem, the rest · Maintainers:
"James E.J. Bottomley", "Martin K. Petersen", Linus Torvalds
During system resume/suspend, hba could be NULL. In this case, do not touch
eh_sem.
Fixes: 88a92d6ae4fe ("scsi: ufs: Serialize eh_work with system PM events and async scan")
Acked-by: Stanley Chu <redacted>
Signed-off-by: Can Guo <redacted>
---
drivers/scsi/ufs/ufshcd.c | 17 ++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 53fd59c..969aed9 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c@@ -94,6 +94,8 @@ 16, 4, buf, __len, false); \ } while (0) +static bool early_suspend; + int ufshcd_dump_regs(struct ufs_hba *hba, size_t offset, size_t len, const char *prefix) {
@@ -8953,8 +8955,14 @@ int ufshcd_system_suspend(struct ufs_hba *hba) int ret = 0; ktime_t start = ktime_get(); + if (!hba) { + early_suspend = true; + return 0; + } + down(&hba->eh_sem); - if (!hba || !hba->is_powered) + + if (!hba->is_powered) return 0; if ((ufs_get_pm_lvl_to_dev_pwr_mode(hba->spm_lvl) ==
@@ -9002,9 +9010,12 @@ int ufshcd_system_resume(struct ufs_hba *hba) int ret = 0; ktime_t start = ktime_get(); - if (!hba) { - up(&hba->eh_sem); + if (!hba) return -EINVAL; + + if (unlikely(early_suspend)) { + early_suspend = false; + down(&hba->eh_sem); } if (!hba->is_powered || pm_runtime_suspended(hba->dev))
--
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