From: Liang He windhl@126.com
commit a3435afba87dc6cd83f5595e7607f3c40f93ef01 upstream.
In ufshcd_populate_vreg(), we should hold the reference returned by of_parse_phandle() and then use it to call of_node_put() for refcount balance.
Link: https://lore.kernel.org/r/20220719071529.1081166-1-windhl@126.com Fixes: aa4976130934 ("ufs: Add regulator enable support") Reviewed-by: Bart Van Assche bvanassche@acm.org Signed-off-by: Liang He windhl@126.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/scsi/ufs/ufshcd-pltfrm.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-)
--- a/drivers/scsi/ufs/ufshcd-pltfrm.c +++ b/drivers/scsi/ufs/ufshcd-pltfrm.c @@ -107,9 +107,20 @@ out: return ret; }
+static bool phandle_exists(const struct device_node *np, + const char *phandle_name, int index) +{ + struct device_node *parse_np = of_parse_phandle(np, phandle_name, index); + + if (parse_np) + of_node_put(parse_np); + + return parse_np != NULL; +} + #define MAX_PROP_SIZE 32 static int ufshcd_populate_vreg(struct device *dev, const char *name, - struct ufs_vreg **out_vreg) + struct ufs_vreg **out_vreg) { char prop_name[MAX_PROP_SIZE]; struct ufs_vreg *vreg = NULL; @@ -121,7 +132,7 @@ static int ufshcd_populate_vreg(struct d }
snprintf(prop_name, MAX_PROP_SIZE, "%s-supply", name); - if (!of_parse_phandle(np, prop_name, 0)) { + if (!phandle_exists(np, prop_name, 0)) { dev_info(dev, "%s: Unable to find %s regulator, assuming enabled\n", __func__, prop_name); goto out;