Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755304Ab3CDDma (ORCPT ); Sun, 3 Mar 2013 22:42:30 -0500 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:60723 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755000Ab3CDDm0 (ORCPT ); Sun, 3 Mar 2013 22:42:26 -0500 Message-Id: <20130304033708.182071615@decadent.org.uk> User-Agent: quilt/0.60-1 Date: Mon, 04 Mar 2013 03:37:12 +0000 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: akpm@linux-foundation.org, Laurent Pinchart , Sylwester Nawrocki , Mauro Carvalho Chehab Subject: [ 005/153] [media] v4l: Reset subdev v4l2_dev field to NULL if registration fails In-Reply-To: <20130304033707.648729212@decadent.org.uk> X-SA-Exim-Connect-IP: 2001:470:1f08:1539:a11:96ff:fec6:70c4 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2549 Lines: 83 3.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Laurent Pinchart commit 317efce991620adc589b3005b9baed433dcb2a56 upstream. When subdev registration fails the subdev v4l2_dev field is left to a non-NULL value. Later calls to v4l2_device_unregister_subdev() will consider the subdev as registered and will module_put() the subdev module without any matching module_get(). Fix this by setting the subdev v4l2_dev field to NULL in v4l2_device_register_subdev() when the function fails. Signed-off-by: Laurent Pinchart Acked-by: Sylwester Nawrocki Signed-off-by: Mauro Carvalho Chehab [bwh: Backported to 3.2: adjust context, filename] Signed-off-by: Ben Hutchings --- --- a/drivers/media/video/v4l2-device.c +++ b/drivers/media/video/v4l2-device.c @@ -159,31 +159,21 @@ int v4l2_device_register_subdev(struct v sd->v4l2_dev = v4l2_dev; if (sd->internal_ops && sd->internal_ops->registered) { err = sd->internal_ops->registered(sd); - if (err) { - module_put(sd->owner); - return err; - } + if (err) + goto error_module; } /* This just returns 0 if either of the two args is NULL */ err = v4l2_ctrl_add_handler(v4l2_dev->ctrl_handler, sd->ctrl_handler); - if (err) { - if (sd->internal_ops && sd->internal_ops->unregistered) - sd->internal_ops->unregistered(sd); - module_put(sd->owner); - return err; - } + if (err) + goto error_unregister; #if defined(CONFIG_MEDIA_CONTROLLER) /* Register the entity. */ if (v4l2_dev->mdev) { err = media_device_register_entity(v4l2_dev->mdev, entity); - if (err < 0) { - if (sd->internal_ops && sd->internal_ops->unregistered) - sd->internal_ops->unregistered(sd); - module_put(sd->owner); - return err; - } + if (err < 0) + goto error_unregister; } #endif @@ -192,6 +182,14 @@ int v4l2_device_register_subdev(struct v spin_unlock(&v4l2_dev->lock); return 0; + +error_unregister: + if (sd->internal_ops && sd->internal_ops->unregistered) + sd->internal_ops->unregistered(sd); +error_module: + module_put(sd->owner); + sd->v4l2_dev = NULL; + return err; } EXPORT_SYMBOL_GPL(v4l2_device_register_subdev); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/