HID: trivial devm conversion for special hid drivers

It is safe to use devres allocation within the hid subsystem:
- the devres release is called _after_ the call to .remove(), meaning
  that no freed pointers will exists while removing the device
- if a .probe() fails, devres releases all the allocated ressources
  before going to the next driver: there will not be ghost ressources
  attached to a hid device if several drivers are probed.

Given that, we can clean up a little some of the HID drivers. These ones
are trivial:
- there is only one kzalloc in the driver
- the .remove() callback contains only one kfree on top of hid_hw_stop()
- the error path in the probe is easy enough to be manually checked

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

5 files changed, 16 insertions, 66 deletions

diff --git a/drivers/hid/hid-a4tech.c b/drivers/hid/hid-a4tech.c
index 7c5507e94820..9428ea7cdf8a 100644
--- a/drivers/hid/hid-a4tech.c
+++ b/drivers/hid/hid-a4tech.c
@@ -90,11 +90,10 @@ static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id)
         struct a4tech_sc *a4;
         int ret;
 
-        a4 = kzalloc(sizeof(*a4), GFP_KERNEL);
+        a4 = devm_kzalloc(&hdev->dev, sizeof(*a4), GFP_KERNEL);
         if (a4 == NULL) {
                 hid_err(hdev, "can't alloc device descriptor\n");
-                ret = -ENOMEM;
-                goto err_free;
+                return -ENOMEM;
         }
 
         a4->quirks = id->driver_data;
@@ -104,27 +103,16 @@ static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id)
         ret = hid_parse(hdev);
         if (ret) {
                 hid_err(hdev, "parse failed\n");
-                goto err_free;
+                return ret;
         }
 
         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
         if (ret) {
                 hid_err(hdev, "hw start failed\n");
-                goto err_free;
+                return ret;
         }
 
         return 0;
-err_free:
-        kfree(a4);
-        return ret;
-}
-
-static void a4_remove(struct hid_device *hdev)
-{
-        struct a4tech_sc *a4 = hid_get_drvdata(hdev);
-
-        hid_hw_stop(hdev);
-        kfree(a4);
 }
 
 static const struct hid_device_id a4_devices[] = {
@@ -144,7 +132,6 @@ static struct hid_driver a4_driver = {
         .input_mapped = a4_input_mapped,
         .event = a4_event,
         .probe = a4_probe,
-        .remove = a4_remove,
 };
 module_hid_driver(a4_driver);
 
diff --git a/drivers/hid/hid-apple.c b/drivers/hid/hid-apple.c
index feae88b53fcd..bad40b9315b2 100644
--- a/drivers/hid/hid-apple.c
+++ b/drivers/hid/hid-apple.c
@@ -349,7 +349,7 @@ static int apple_probe(struct hid_device *hdev,
         unsigned int connect_mask = HID_CONNECT_DEFAULT;
         int ret;
 
-        asc = kzalloc(sizeof(*asc), GFP_KERNEL);
+        asc = devm_kzalloc(&hdev->dev, sizeof(*asc), GFP_KERNEL);
         if (asc == NULL) {
                 hid_err(hdev, "can't alloc apple descriptor\n");
                 return -ENOMEM;
@@ -362,7 +362,7 @@ static int apple_probe(struct hid_device *hdev,
         ret = hid_parse(hdev);
         if (ret) {
                 hid_err(hdev, "parse failed\n");
-                goto err_free;
+                return ret;
         }
 
         if (quirks & APPLE_HIDDEV)
@@ -373,19 +373,10 @@ static int apple_probe(struct hid_device *hdev,
         ret = hid_hw_start(hdev, connect_mask);
         if (ret) {
                 hid_err(hdev, "hw start failed\n");
-                goto err_free;
+                return ret;
         }
 
         return 0;
-err_free:
-        kfree(asc);
-        return ret;
-}
-
-static void apple_remove(struct hid_device *hdev)
-{
-        hid_hw_stop(hdev);
-        kfree(hid_get_drvdata(hdev));
 }
 
 static const struct hid_device_id apple_devices[] = {
@@ -545,7 +536,6 @@ static struct hid_driver apple_driver = {
         .id_table = apple_devices,
         .report_fixup = apple_report_fixup,
         .probe = apple_probe,
-        .remove = apple_remove,
         .event = apple_event,
         .input_mapping = apple_input_mapping,
         .input_mapped = apple_input_mapped,
diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c
index 5bc37343eb22..d393eb7ddaf0 100644
--- a/drivers/hid/hid-magicmouse.c
+++ b/drivers/hid/hid-magicmouse.c
@@ -484,7 +484,7 @@ static int magicmouse_probe(struct hid_device *hdev,
         struct hid_report *report;
         int ret;
 
-        msc = kzalloc(sizeof(*msc), GFP_KERNEL);
+        msc = devm_kzalloc(&hdev->dev, sizeof(*msc), GFP_KERNEL);
         if (msc == NULL) {
                 hid_err(hdev, "can't alloc magicmouse descriptor\n");
                 return -ENOMEM;
@@ -498,13 +498,13 @@ static int magicmouse_probe(struct hid_device *hdev,
         ret = hid_parse(hdev);
         if (ret) {
                 hid_err(hdev, "magicmouse hid parse failed\n");
-                goto err_free;
+                return ret;
         }
 
         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
         if (ret) {
                 hid_err(hdev, "magicmouse hw start failed\n");
-                goto err_free;
+                return ret;
         }
 
         if (!msc->input) {
@@ -548,19 +548,9 @@ static int magicmouse_probe(struct hid_device *hdev,
         return 0;
 err_stop_hw:
         hid_hw_stop(hdev);
-err_free:
-        kfree(msc);
         return ret;
 }
 
-static void magicmouse_remove(struct hid_device *hdev)
-{
-        struct magicmouse_sc *msc = hid_get_drvdata(hdev);
-
-        hid_hw_stop(hdev);
-        kfree(msc);
-}
-
 static const struct hid_device_id magic_mice[] = {
         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
                 USB_DEVICE_ID_APPLE_MAGICMOUSE), .driver_data = 0 },
@@ -574,7 +564,6 @@ static struct hid_driver magicmouse_driver = {
         .name = "magicmouse",
         .id_table = magic_mice,
         .probe = magicmouse_probe,
-        .remove = magicmouse_remove,
         .raw_event = magicmouse_raw_event,
         .input_mapping = magicmouse_input_mapping,
         .input_configured = magicmouse_input_configured,
diff --git a/drivers/hid/hid-sony.c b/drivers/hid/hid-sony.c
index ecbc74923d06..f9898aad72fa 100644
--- a/drivers/hid/hid-sony.c
+++ b/drivers/hid/hid-sony.c
@@ -623,7 +623,7 @@ static int sony_probe(struct hid_device *hdev, const struct hid_device_id *id)
         struct sony_sc *sc;
         unsigned int connect_mask = HID_CONNECT_DEFAULT;
 
-        sc = kzalloc(sizeof(*sc), GFP_KERNEL);
+        sc = devm_kzalloc(&hdev->dev, sizeof(*sc), GFP_KERNEL);
         if (sc == NULL) {
                 hid_err(hdev, "can't alloc sony descriptor\n");
                 return -ENOMEM;
@@ -635,7 +635,7 @@ static int sony_probe(struct hid_device *hdev, const struct hid_device_id *id)
         ret = hid_parse(hdev);
         if (ret) {
                 hid_err(hdev, "parse failed\n");
-                goto err_free;
+                return ret;
         }
 
         if (sc->quirks & VAIO_RDESC_CONSTANT)
@@ -648,7 +648,7 @@ static int sony_probe(struct hid_device *hdev, const struct hid_device_id *id)
         ret = hid_hw_start(hdev, connect_mask);
         if (ret) {
                 hid_err(hdev, "hw start failed\n");
-                goto err_free;
+                return ret;
         }
 
         if (sc->quirks & SIXAXIS_CONTROLLER_USB) {
@@ -668,8 +668,6 @@ static int sony_probe(struct hid_device *hdev, const struct hid_device_id *id)
         return 0;
 err_stop:
         hid_hw_stop(hdev);
-err_free:
-        kfree(sc);
         return ret;
 }
 
@@ -681,7 +679,6 @@ static void sony_remove(struct hid_device *hdev)
                 buzz_remove(hdev);
 
         hid_hw_stop(hdev);
-        kfree(sc);
 }
 
 static const struct hid_device_id sony_devices[] = {
diff --git a/drivers/hid/hid-zydacron.c b/drivers/hid/hid-zydacron.c
index e4cddeccd6b5..1a660bd97ab2 100644
--- a/drivers/hid/hid-zydacron.c
+++ b/drivers/hid/hid-zydacron.c
@@ -169,7 +169,7 @@ static int zc_probe(struct hid_device *hdev, const struct hid_device_id *id)
         int ret;
         struct zc_device *zc;
 
-        zc = kzalloc(sizeof(*zc), GFP_KERNEL);
+        zc = devm_kzalloc(&hdev->dev, sizeof(*zc), GFP_KERNEL);
         if (zc == NULL) {
                 hid_err(hdev, "can't alloc descriptor\n");
                 return -ENOMEM;
@@ -180,28 +180,16 @@ static int zc_probe(struct hid_device *hdev, const struct hid_device_id *id)
         ret = hid_parse(hdev);
         if (ret) {
                 hid_err(hdev, "parse failed\n");
-                goto err_free;
+                return ret;
         }
 
         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
         if (ret) {
                 hid_err(hdev, "hw start failed\n");
-                goto err_free;
+                return ret;
         }
 
         return 0;
-err_free:
-        kfree(zc);
-
-        return ret;
-}
-
-static void zc_remove(struct hid_device *hdev)
-{
-        struct zc_device *zc = hid_get_drvdata(hdev);
-
-        hid_hw_stop(hdev);
-        kfree(zc);
 }
 
 static const struct hid_device_id zc_devices[] = {
@@ -217,7 +205,6 @@ static struct hid_driver zc_driver = {
         .input_mapping = zc_input_mapping,
         .raw_event = zc_raw_event,
         .probe = zc_probe,
-        .remove = zc_remove,
 };
 module_hid_driver(zc_driver);