From c1700479845bc36cb48719b2ae341d4df89a73f6 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Wed, 4 Nov 2015 18:55:22 +0100 Subject: [PATCH] greybus: hd: fix host-device life time issues Fix host-device life time issues by separating host-device allocation from registration. This is needed both to make sure that all host-device resources are available before registering the device and to prevent such resources from being deallocated while the device is still in use during device removal. This specifically fixes the following warnings during es1 and es2 disconnect: usb 1-1.1: No free CPort OUT urbs, having to dynamically allocate one! Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/staging/greybus/es1.c | 9 ++++++++- drivers/staging/greybus/es2.c | 9 ++++++++- drivers/staging/greybus/hd.c | 24 ++++++++++++++++-------- drivers/staging/greybus/hd.h | 4 +++- 4 files changed, 35 insertions(+), 11 deletions(-) diff --git a/drivers/staging/greybus/es1.c b/drivers/staging/greybus/es1.c index 858c4aa9e28a..75253d9a942b 100644 --- a/drivers/staging/greybus/es1.c +++ b/drivers/staging/greybus/es1.c @@ -390,7 +390,7 @@ static void es1_destroy(struct es1_ap_dev *es1) } udev = es1->usb_dev; - gb_hd_remove(es1->hd); + gb_hd_put(es1->hd); usb_put_dev(udev); } @@ -403,6 +403,8 @@ static void ap_disconnect(struct usb_interface *interface) for (i = 0; i < NUM_CPORT_IN_URB; ++i) usb_kill_urb(es1->cport_in_urb[i]); + gb_hd_del(es1->hd); + es1_destroy(es1); } @@ -692,6 +694,10 @@ static int ap_probe(struct usb_interface *interface, gb_debugfs_get(), es1, &apb1_log_enable_fops); + retval = gb_hd_add(hd); + if (retval) + goto error; + for (i = 0; i < NUM_CPORT_IN_URB; ++i) { retval = usb_submit_urb(es1->cport_in_urb[i], GFP_KERNEL); if (retval) @@ -703,6 +709,7 @@ static int ap_probe(struct usb_interface *interface, err_kill_in_urbs: for (--i; i >= 0; --i) usb_kill_urb(es1->cport_in_urb[i]); + gb_hd_del(hd); error: es1_destroy(es1); diff --git a/drivers/staging/greybus/es2.c b/drivers/staging/greybus/es2.c index 96ba1a74bb69..aad6451d90de 100644 --- a/drivers/staging/greybus/es2.c +++ b/drivers/staging/greybus/es2.c @@ -585,7 +585,7 @@ static void es2_destroy(struct es2_ap_dev *es2) udev = es2->usb_dev; cport_to_ep = es2->cport_to_ep; - gb_hd_remove(es2->hd); + gb_hd_put(es2->hd); kfree(cport_to_ep); usb_put_dev(udev); @@ -599,6 +599,8 @@ static void ap_disconnect(struct usb_interface *interface) for (i = 0; i < NUM_BULKS; ++i) es2_cport_in_disable(es2, &es2->cport_in[i]); + gb_hd_del(es2->hd); + es2_destroy(es2); } @@ -942,6 +944,10 @@ static int ap_probe(struct usb_interface *interface, gb_debugfs_get(), es2, &apb_log_enable_fops); + retval = gb_hd_add(hd); + if (retval) + goto error; + for (i = 0; i < NUM_BULKS; ++i) { retval = es2_cport_in_enable(es2, &es2->cport_in[i]); if (retval) @@ -953,6 +959,7 @@ static int ap_probe(struct usb_interface *interface, err_disable_cport_in: for (--i; i >= 0; --i) es2_cport_in_disable(es2, &es2->cport_in[i]); + gb_hd_del(hd); error: es2_destroy(es2); diff --git a/drivers/staging/greybus/hd.c b/drivers/staging/greybus/hd.c index 6f29eb49993a..b22d5470508a 100644 --- a/drivers/staging/greybus/hd.c +++ b/drivers/staging/greybus/hd.c @@ -77,6 +77,12 @@ struct gb_host_device *gb_hd_create(struct gb_hd_driver *driver, hd->buffer_size_max = buffer_size_max; hd->num_cports = num_cports; + return hd; +} +EXPORT_SYMBOL_GPL(gb_hd_create); + +int gb_hd_add(struct gb_host_device *hd) +{ /* * Initialize AP's SVC protocol connection: * @@ -87,16 +93,14 @@ struct gb_host_device *gb_hd_create(struct gb_hd_driver *driver, * time we will create a fully initialized svc-connection, as we need * endo-id and AP's interface id for that. */ - if (!gb_ap_svc_connection_create(hd)) { - kref_put_mutex(&hd->kref, free_hd, &hd_mutex); - return ERR_PTR(-ENOMEM); - } + if (!gb_ap_svc_connection_create(hd)) + return -ENOMEM; - return hd; + return 0; } -EXPORT_SYMBOL_GPL(gb_hd_create); +EXPORT_SYMBOL_GPL(gb_hd_add); -void gb_hd_remove(struct gb_host_device *hd) +void gb_hd_del(struct gb_host_device *hd) { /* * Tear down all interfaces, modules, and the endo that is associated @@ -109,7 +113,11 @@ void gb_hd_remove(struct gb_host_device *hd) /* Is the SVC still using the partially uninitialized connection ? */ if (hd->initial_svc_connection) gb_connection_destroy(hd->initial_svc_connection); +} +EXPORT_SYMBOL_GPL(gb_hd_del); +void gb_hd_put(struct gb_host_device *hd) +{ kref_put_mutex(&hd->kref, free_hd, &hd_mutex); } -EXPORT_SYMBOL_GPL(gb_hd_remove); +EXPORT_SYMBOL_GPL(gb_hd_put); diff --git a/drivers/staging/greybus/hd.h b/drivers/staging/greybus/hd.h index 91fcccb46df1..6724cfea1e19 100644 --- a/drivers/staging/greybus/hd.h +++ b/drivers/staging/greybus/hd.h @@ -52,6 +52,8 @@ struct gb_host_device *gb_hd_create(struct gb_hd_driver *driver, struct device *parent, size_t buffer_size_max, size_t num_cports); -void gb_hd_remove(struct gb_host_device *hd); +int gb_hd_add(struct gb_host_device *hd); +void gb_hd_del(struct gb_host_device *hd); +void gb_hd_put(struct gb_host_device *hd); #endif /* __HD_H */