Date: Sun, 25 Dec 2016 19:49:09 +0000 (UTC) From: Hans Petter Selasky <hselasky@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r310553 - head/sys/compat/linuxkpi/common/include/linux Message-ID: <201612251949.uBPJn9TS081353@repo.freebsd.org>
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Author: hselasky Date: Sun Dec 25 19:49:09 2016 New Revision: 310553 URL: https://svnweb.freebsd.org/changeset/base/310553 Log: Improve LinuxKPI device support. Only delete own BSD devices and not the ones obtained through devclass_get_device(). Some minor code cleanups while at it. Obtained from: kmacy @ MFC after: 1 week Sponsored by: Mellanox Technologies Modified: head/sys/compat/linuxkpi/common/include/linux/device.h Modified: head/sys/compat/linuxkpi/common/include/linux/device.h ============================================================================== --- head/sys/compat/linuxkpi/common/include/linux/device.h Sun Dec 25 19:38:07 2016 (r310552) +++ head/sys/compat/linuxkpi/common/include/linux/device.h Sun Dec 25 19:49:09 2016 (r310553) @@ -63,6 +63,14 @@ struct device { struct device *parent; struct list_head irqents; device_t bsddev; + /* + * The following flag is used to determine if the LinuxKPI is + * responsible for detaching the BSD device or not. If the + * LinuxKPI got the BSD device using devclass_get_device(), it + * must not try to detach or delete it, because it's already + * done somewhere else. + */ + bool bsddev_attached_here; dev_t devt; struct class *class; void (*release)(struct device *dev); @@ -208,23 +216,36 @@ static inline struct device *kobj_to_dev static inline void device_initialize(struct device *dev) { - device_t bsddev; + device_t bsddev = NULL; + int unit = -1; - bsddev = NULL; if (dev->devt) { - int unit = MINOR(dev->devt); + unit = MINOR(dev->devt); bsddev = devclass_get_device(dev->class->bsdclass, unit); + dev->bsddev_attached_here = false; + } else if (dev->parent == NULL) { + bsddev = devclass_get_device(dev->class->bsdclass, 0); + dev->bsddev_attached_here = false; + } else { + dev->bsddev_attached_here = true; + } + + if (bsddev == NULL && dev->parent != NULL) { + bsddev = device_add_child(dev->parent->bsddev, + dev->class->kobj.name, unit); } + if (bsddev != NULL) device_set_softc(bsddev, dev); dev->bsddev = bsddev; + MPASS(dev->bsddev != NULL); kobject_init(&dev->kobj, &linux_dev_ktype); } static inline int device_add(struct device *dev) -{ +{ if (dev->bsddev != NULL) { if (dev->devt == 0) dev->devt = makedev(0, device_get_unit(dev->bsddev)); @@ -256,13 +277,13 @@ device_create_groups_vargs(struct class goto error; } - device_initialize(dev); dev->devt = devt; dev->class = class; dev->parent = parent; dev->groups = groups; dev->release = device_create_release; - dev->bsddev = devclass_get_device(dev->class->bsdclass, MINOR(devt)); + /* device_initialize() needs the class and parent to be set */ + device_initialize(dev); dev_set_drvdata(dev, drvdata); retval = kobject_set_name_vargs(&dev->kobj, fmt, args); @@ -298,17 +319,21 @@ device_create_with_groups(struct class * static inline int device_register(struct device *dev) { - device_t bsddev; - int unit; + device_t bsddev = NULL; + int unit = -1; - bsddev = NULL; - unit = -1; + if (dev->bsddev != NULL) + goto done; if (dev->devt) { unit = MINOR(dev->devt); bsddev = devclass_get_device(dev->class->bsdclass, unit); + dev->bsddev_attached_here = false; } else if (dev->parent == NULL) { bsddev = devclass_get_device(dev->class->bsdclass, 0); + dev->bsddev_attached_here = false; + } else { + dev->bsddev_attached_here = true; } if (bsddev == NULL && dev->parent != NULL) { bsddev = device_add_child(dev->parent->bsddev, @@ -320,6 +345,7 @@ device_register(struct device *dev) device_set_softc(bsddev, dev); } dev->bsddev = bsddev; +done: kobject_init(&dev->kobj, &linux_dev_ktype); kobject_add(&dev->kobj, &dev->class->kobj, dev_name(dev)); @@ -334,7 +360,7 @@ device_unregister(struct device *dev) bsddev = dev->bsddev; dev->bsddev = NULL; - if (bsddev != NULL) { + if (bsddev != NULL && dev->bsddev_attached_here) { mtx_lock(&Giant); device_delete_child(device_get_parent(bsddev), bsddev); mtx_unlock(&Giant); @@ -350,7 +376,7 @@ device_del(struct device *dev) bsddev = dev->bsddev; dev->bsddev = NULL; - if (bsddev != NULL) { + if (bsddev != NULL && dev->bsddev_attached_here) { mtx_lock(&Giant); device_delete_child(device_get_parent(bsddev), bsddev); mtx_unlock(&Giant);
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