pps: using ERR_PTR instead of NULL while pps_register_source fails

pps_register_source() has keeps error codes in a local variable,
but it does not make use of the code. This patch let it return
the errcode in case of failure.

Suggested-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Acked-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

5 files changed, 10 insertions, 9 deletions

diff --git a/drivers/pps/clients/pps-gpio.c b/drivers/pps/clients/pps-gpio.c
index 333ad7d5b45b..dd5d1103e02b 100644
--- a/drivers/pps/clients/pps-gpio.c
+++ b/drivers/pps/clients/pps-gpio.c
@@ -158,10 +158,10 @@ static int pps_gpio_probe(struct platform_device *pdev)
         if (data->capture_clear)
                 pps_default_params |= PPS_CAPTURECLEAR | PPS_OFFSETCLEAR;
         data->pps = pps_register_source(&data->info, pps_default_params);
-        if (data->pps == NULL) {
+        if (IS_ERR(data->pps)) {
                 dev_err(&pdev->dev, "failed to register IRQ %d as PPS source\n",
                         data->irq);
-                return -EINVAL;
+                return PTR_ERR(data->pps);
         }
 
         /* register IRQ interrupt handler */
diff --git a/drivers/pps/clients/pps-ktimer.c b/drivers/pps/clients/pps-ktimer.c
index 04735649052a..728818b87af3 100644
--- a/drivers/pps/clients/pps-ktimer.c
+++ b/drivers/pps/clients/pps-ktimer.c
@@ -80,9 +80,9 @@ static int __init pps_ktimer_init(void)
 {
         pps = pps_register_source(&pps_ktimer_info,
                                 PPS_CAPTUREASSERT | PPS_OFFSETASSERT);
-        if (pps == NULL) {
+        if (IS_ERR(pps)) {
                 pr_err("cannot register PPS source\n");
-                return -ENOMEM;
+                return PTR_ERR(pps);
         }
 
         timer_setup(&ktimer, pps_ktimer_event, 0);
diff --git a/drivers/pps/clients/pps-ldisc.c b/drivers/pps/clients/pps-ldisc.c
index 73bd3bb4d93b..00f6c460e493 100644
--- a/drivers/pps/clients/pps-ldisc.c
+++ b/drivers/pps/clients/pps-ldisc.c
@@ -72,9 +72,9 @@ static int pps_tty_open(struct tty_struct *tty)
 
         pps = pps_register_source(&info, PPS_CAPTUREBOTH | \
                                 PPS_OFFSETASSERT | PPS_OFFSETCLEAR);
-        if (pps == NULL) {
+        if (IS_ERR(pps)) {
                 pr_err("cannot register PPS source \"%s\"\n", info.path);
-                return -ENOMEM;
+                return PTR_ERR(pps);
         }
         pps->lookup_cookie = tty;
 
diff --git a/drivers/pps/clients/pps_parport.c b/drivers/pps/clients/pps_parport.c
index 4db824f88d00..7226e39aae83 100644
--- a/drivers/pps/clients/pps_parport.c
+++ b/drivers/pps/clients/pps_parport.c
@@ -179,7 +179,7 @@ static void parport_attach(struct parport *port)
 
         device->pps = pps_register_source(&info,
                         PPS_CAPTUREBOTH | PPS_OFFSETASSERT | PPS_OFFSETCLEAR);
-        if (device->pps == NULL) {
+        if (IS_ERR(device->pps)) {
                 pr_err("couldn't register PPS source\n");
                 goto err_release_dev;
         }
diff --git a/drivers/pps/kapi.c b/drivers/pps/kapi.c
index 805c749ac1ad..a1c3cd38754f 100644
--- a/drivers/pps/kapi.c
+++ b/drivers/pps/kapi.c
@@ -72,7 +72,8 @@ static void pps_echo_client_default(struct pps_device *pps, int event,
  * source is described by info's fields and it will have, as default PPS
  * parameters, the ones specified into default_params.
  *
- * The function returns, in case of success, the PPS device. Otherwise NULL.
+ * The function returns, in case of success, the PPS device. Otherwise
+ * ERR_PTR(errno).
  */
 
 struct pps_device *pps_register_source(struct pps_source_info *info,
@@ -135,7 +136,7 @@ kfree_pps:
 pps_register_source_exit:
         pr_err("%s: unable to register source\n", info->name);
 
-        return NULL;
+        return ERR_PTR(err);
 }
 EXPORT_SYMBOL(pps_register_source);