If no voltage supply regulators are defined for the UFS devices (assumed
they are always-on), ufshcd_config_vreg_load() can be called on
suspend/resume paths with vreg == NULL as hba->vreg_info.vcc* equal to
NULL, and it causes NULL pointer dereference.
This fixes it by making ufshcd_config_vreg_{h,l}pm noop when no regulators
are defined.
Signed-off-by: Akinobu Mita <mita@xxxxxxxxxxxx>
Cc: Vinayak Holikatti <vinholikatti@xxxxxxxxx>
Cc: Subhash Jadavani <subhashj@xxxxxxxxxxxxxx>
Cc: Dolev Raviv <draviv@xxxxxxxxxxxxxx>
Cc: Sujit Reddy Thumma <sthumma@xxxxxxxxxxxxxx>
Cc: Yaniv Gardi <ygardi@xxxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: "James E.J. Bottomley" <JBottomley@xxxxxxxxxxxxx>
Cc: linux-scsi@xxxxxxxxxxxxxxx
---
drivers/scsi/ufs/ufshcd.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 59b6544..d18adc4 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -4248,12 +4248,18 @@ static int ufshcd_config_vreg_load(struct device *dev, struct ufs_vreg *vreg,
static inline int ufshcd_config_vreg_lpm(struct ufs_hba *hba,
struct ufs_vreg *vreg)
{
+ if (!vreg)
+ return 0;
+
return ufshcd_config_vreg_load(hba->dev, vreg, UFS_VREG_LPM_LOAD_UA);
}
static inline int ufshcd_config_vreg_hpm(struct ufs_hba *hba,
struct ufs_vreg *vreg)
{
+ if (!vreg)
+ return 0;
+
return ufshcd_config_vreg_load(hba->dev, vreg, vreg->max_uA);
}
--
1.9.1
--
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