From 0f9df939385527049c8062a099fbfa1479fe7ce0 Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Mon, 22 Oct 2012 22:15:05 +0200 Subject: usb: gadget: uvc: fix error path in uvc_function_bind() The "video->minor = -1" assigment is done in V4L2 by video_register_device() so it is removed here. Now. uvc_function_bind() calls in error case uvc_function_unbind() for cleanup. The problem is that uvc_function_unbind() frees the uvc struct and uvc_bind_config() does as well in error case of usb_add_function(). Removing kfree() in usb_add_function() would make the patch smaller but it would look odd because the new allocated memory is not cleaned up. However it is not guaranteed that if we call usb_add_function() we also get to the bind function. Therefore the patch extracts the conditional cleanup from uvc_function_unbind() applies to uvc_function_bind(). uvc_function_unbind() now contains only the complete cleanup which is required once everything has been registrated. Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: Bhupesh Sharma <bhupesh.sharma@st.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com> --- drivers/usb/gadget/f_uvc.c | 39 +++++++++++++++++++++------------------ 1 file changed, 21 insertions(+), 18 deletions(-) diff --git a/drivers/usb/gadget/f_uvc.c b/drivers/usb/gadget/f_uvc.c index 2a8bf0655c6..10f13c1213c 100644 --- a/drivers/usb/gadget/f_uvc.c +++ b/drivers/usb/gadget/f_uvc.c @@ -417,7 +417,6 @@ uvc_register_video(struct uvc_device *uvc) return -ENOMEM; video->parent = &cdev->gadget->dev; - video->minor = -1; video->fops = &uvc_v4l2_fops; video->release = video_device_release; strncpy(video->name, cdev->gadget->name, sizeof(video->name)); @@ -577,23 +576,12 @@ uvc_function_unbind(struct usb_configuration *c, struct usb_function *f) INFO(cdev, "uvc_function_unbind\n"); - if (uvc->vdev) { - if (uvc->vdev->minor == -1) - video_device_release(uvc->vdev); - else - video_unregister_device(uvc->vdev); - uvc->vdev = NULL; - } - - if (uvc->control_ep) - uvc->control_ep->driver_data = NULL; - if (uvc->video.ep) - uvc->video.ep->driver_data = NULL; + video_unregister_device(uvc->vdev); + uvc->control_ep->driver_data = NULL; + uvc->video.ep->driver_data = NULL; - if (uvc->control_req) { - usb_ep_free_request(cdev->gadget->ep0, uvc->control_req); - kfree(uvc->control_buf); - } + usb_ep_free_request(cdev->gadget->ep0, uvc->control_req); + kfree(uvc->control_buf); kfree(f->descriptors); kfree(f->hs_descriptors); @@ -740,7 +728,22 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f) return 0; error: - uvc_function_unbind(c, f); + if (uvc->vdev) + video_device_release(uvc->vdev); + + if (uvc->control_ep) + uvc->control_ep->driver_data = NULL; + if (uvc->video.ep) + uvc->video.ep->driver_data = NULL; + + if (uvc->control_req) { + usb_ep_free_request(cdev->gadget->ep0, uvc->control_req); + kfree(uvc->control_buf); + } + + kfree(f->descriptors); + kfree(f->hs_descriptors); + kfree(f->ss_descriptors); return ret; } -- cgit v1.2.3-18-g5258