litmus-rt.git - The LITMUS^RT kernel.

diff options

Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2x00queue.c')

-rw-r--r--

drivers/net/wireless/rt2x00/rt2x00queue.c

1 files changed, 2 insertions, 2 deletions


diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c index 50590b1420a5..a5d38e8ad9e4 100644 --- a/drivers/net/wireless/rt2x00/rt2x00queue.c +++ b/drivers/net/wireless/rt2x00/rt2x00queue.c
@@ -635,7 +635,7 @@ static void rt2x00queue_bar_check(struct queue_entry *entry)
635	}	635	}
636		636
637	int rt2x00queue_write_tx_frame(struct data_queue queue, struct sk_buff skb,	637	int rt2x00queue_write_tx_frame(struct data_queue queue, struct sk_buff skb,
638	bool local)	638	struct ieee80211_sta *sta, bool local)
639	{	639	{
640	struct ieee80211_tx_info *tx_info;	640	struct ieee80211_tx_info *tx_info;
641	struct queue_entry *entry;	641	struct queue_entry *entry;
@@ -649,7 +649,7 @@ int rt2x00queue_write_tx_frame(struct data_queue queue, struct sk_buff skb,
649	* after that we are free to use the skb->cb array	649	* after that we are free to use the skb->cb array
650	* for our information.	650	* for our information.
651	*/	651	*/
652	rt2x00queue_create_tx_descriptor(queue->rt2x00dev, skb, &txdesc, NULL);	652	rt2x00queue_create_tx_descriptor(queue->rt2x00dev, skb, &txdesc, sta);
653		653
654	/*	654	/*
655	* All information is retrieved from the skb->cb array,	655	* All information is retrieved from the skb->cb array,

/* * linux/ipc/util.c * Copyright (C) 1992 Krishna Balasubramanian * * Sep 1997 - Call suser() last after "normal" permission checks so we * get BSD style process accounting right. * Occurs in several places in the IPC code. * Chris Evans, <chris@ferret.lmh.ox.ac.uk> * Nov 1999 - ipc helper functions, unified SMP locking * Manfred Spraul <manfred@colorfullife.com> * Oct 2002 - One lock per IPC id. RCU ipc_free for lock-free grow_ary(). * Mingming Cao <cmm@us.ibm.com> * Mar 2006 - support for audit of ipc object properties * Dustin Kirkland <dustin.kirkland@us.ibm.com> * Jun 2006 - namespaces ssupport * OpenVZ, SWsoft Inc. * Pavel Emelianov <xemul@openvz.org> */ #include <linux/mm.h> #include <linux/shm.h> #include <linux/init.h> #include <linux/msg.h> #include <linux/vmalloc.h> #include <linux/slab.h> #include <linux/capability.h> #include <linux/highuid.h> #include <linux/security.h> #include <linux/rcupdate.h> #include <linux/workqueue.h> #include <linux/seq_file.h> #include <linux/proc_fs.h> #include <linux/audit.h> #include <linux/nsproxy.h> #include <linux/rwsem.h> #include <linux/memory.h> #include <linux/ipc_namespace.h> #include <asm/unistd.h> #include "util.h" struct ipc_proc_iface { const char *path; const char *header; int ids; int (*show)(struct seq_file *, void *); }; struct ipc_namespace init_ipc_ns = { .kref = { .refcount = ATOMIC_INIT(2), }, }; atomic_t nr_ipc_ns = ATOMIC_INIT(1); #ifdef CONFIG_MEMORY_HOTPLUG static void ipc_memory_notifier(struct work_struct *work) { ipcns_notify(IPCNS_MEMCHANGED); } static DECLARE_WORK(ipc_memory_wq, ipc_memory_notifier); static int ipc_memory_callback(struct notifier_block *self, unsigned long action, void *arg) { switch (action) { case MEM_ONLINE: /* memory successfully brought online */ case MEM_OFFLINE: /* or offline: it's time to recompute msgmni */ /* * This is done by invoking the ipcns notifier chain with the * IPC_MEMCHANGED event. * In order not to keep the lock on the hotplug memory chain * for too long, queue a work item that will, when waken up, * activate the ipcns notification chain. * No need to keep several ipc work items on the queue. */ if (!work_pending(&ipc_memory_wq)) schedule_work(&ipc_memory_wq); break; case MEM_GOING_ONLINE: case MEM_GOING_OFFLINE: case MEM_CANCEL_ONLINE: case MEM_CANCEL_OFFLINE: default: break; } return NOTIFY_OK; } #endif /* CONFIG_MEMORY_HOTPLUG */ /** * ipc_init - initialise IPC subsystem * * The various system5 IPC resources (semaphores, messages and shared * memory) are initialised * A callback routine is registered into the memory hotplug notifier * chain: since msgmni scales to lowmem this callback routine will be * called upon successful memory add / remove to recompute msmgni. */ static int __init ipc_init(void) { sem_init(); msg_init(); shm_init(); hotplug_memory_notifier(ipc_memory_callback, IPC_CALLBACK_PRI); register_ipcns_notifier(&init_ipc_ns); return 0; } __initcall(ipc_init); /** * ipc_init_ids - initialise IPC identifiers * @ids: Identifier set * * Set up the sequence range to use for the ipc identifier range (limited * below IPCMNI) then initialise the ids idr. */ void ipc_init_ids(struct ipc_ids *ids) { init_rwsem(&ids->rw_mutex); ids->in_use = 0; ids->seq = 0; { int seq_limit = INT_MAX/SEQ_MULTIPLIER; if (seq_limit > USHORT_MAX) ids->seq_max = USHORT_MAX; else ids->seq_max = seq_limit; } idr_init(&ids->ipcs_idr); } #ifdef CONFIG_PROC_FS static const struct file_operations sysvipc_proc_fops; /** * ipc_init_proc_interface - Create a proc interface for sysipc types using a seq_file interface. * @path: Path in procfs * @header: Banner to be printed at the beginning of the file. * @ids: ipc id table to iterate. * @show: show routine. */ void __init ipc_init_proc_interface(const char *path, const char *header, int ids, int (*show)(struct seq_file *, void *)) { struct proc_dir_entry *pde; struct ipc_proc_iface *iface; iface = kmalloc(sizeof(*iface), GFP_KERNEL); if (!iface) return; iface->path = path; iface->header = header; iface->ids = ids; iface->show = show; pde = create_proc_entry(path, S_IRUGO, /* world readable */ NULL /* parent dir */); if (pde) { pde->data = iface; pde->proc_fops = &sysvipc_proc_fops; } else { kfree(iface); } } #endif /** * ipc_findkey - find a key in an ipc identifier set * @ids: Identifier set * @key: The key to find * * Requires ipc_ids.rw_mutex locked. * Returns the LOCKED pointer to the ipc structure if found or NULL * if not. * If key is found ipc points to the owning ipc structure */ static struct kern_ipc_perm *ipc_findkey(struct ipc_ids *ids, key_t key) { struct kern_ipc_perm *ipc; int next_id; int total; for (total = 0, next_id = 0; total < ids->in_use; next_id++) { ipc = idr_find(&ids->ipcs_idr, next_id); if (ipc == NULL) continue; if (ipc->key != key) { total++; continue; } ipc_lock_by_ptr(ipc); return ipc; } return NULL; } /** * ipc_get_maxid - get the last assigned id * @ids: IPC identifier set * * Called with ipc_ids.rw_mutex held. */ int ipc_get_maxid(struct ipc_ids *ids) { struct kern_ipc_perm *ipc; int max_id = -1; int total, id; if (ids->in_use == 0) return -1; if (ids->in_use == IPCMNI) return IPCMNI - 1; /* Look for the last assigned id */ total = 0; for (id = 0; id < IPCMNI && total < ids->in_use; id++) { ipc = idr_find(&ids->ipcs_idr, id); if (ipc != NULL) { max_id = id; total++; } } return max_id; } /** * ipc_addid - add an IPC identifier * @ids: IPC identifier set * @new: new IPC permission set * @size: limit for the number of used ids * * Add an entry 'new' to the IPC ids idr. The permissions object is * initialised and the first free entry is set up and the id assigned * is returned. The 'new' entry is returned in a locked state on success. * On failure the entry is not locked and a negative err-code is returned. * * Called with ipc_ids.rw_mutex held as a writer. */ int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size) { int id, err; if (size > IPCMNI) size = IPCMNI; if (ids->in_use >= size) return -ENOSPC; err = idr_get_new(&ids->ipcs_idr, new, &id); if (err) return err; ids->in_use++; new->cuid = new->uid = current->euid; new->gid = new->cgid = current->egid; new->seq = ids->seq++; if(ids->seq > ids->seq_max) ids->seq = 0; new->id = ipc_buildid(id, new->seq); spin_lock_init(&new->lock); new->deleted = 0; rcu_read_lock(); spin_lock(&new->lock); return id; } /** * ipcget_new - create a new ipc object * @ns: namespace * @ids: IPC identifer set * @ops: the actual creation routine to call * @params: its parameters * * This routine is called by sys_msgget, sys_semget() and sys_shmget() * when the key is IPC_PRIVATE. */ static int ipcget_new(struct ipc_namespace *ns, struct ipc_ids *ids, struct ipc_ops *ops, struct ipc_params *params) { int err; retry: err = idr_pre_get(&ids->ipcs_idr, GFP_KERNEL); if (!err) return -ENOMEM; down_write(&ids->rw_mutex); err = ops->getnew(ns, params); up_write(&ids->rw_mutex); if (err == -EAGAIN) goto retry; return err; } /** * ipc_check_perms - check security and permissions for an IPC * @ipcp: ipc permission set * @ops: the actual security routine to call * @params: its parameters * * This routine is called by sys_msgget(), sys_semget() and sys_shmget() * when the key is not IPC_PRIVATE and that key already exists in the * ids IDR. * * On success, the IPC id is returned. * * It is called with ipc_ids.rw_mutex and ipcp->lock held. */ static int ipc_check_perms(struct kern_ipc_perm *ipcp, struct ipc_ops *ops, struct ipc_params *params) { int err; if (ipcperms(ipcp, params->flg)) err = -EACCES; else { err = ops->associate(ipcp, params->flg); if (!err) err = ipcp->id; } return err; } /** * ipcget_public - get an ipc object or create a new one * @ns: namespace * @ids: IPC identifer set * @ops: the actual creation routine to call * @params: its parameters * * This routine is called by sys_msgget, sys_semget() and sys_shmget() * when the key is not IPC_PRIVATE. * It adds a new entry if the key is not found and does some permission * / security checkings if the key is found. * * On success, the ipc id is returned. */ static int ipcget_public(struct ipc_namespace *ns, struct ipc_ids *ids, struct ipc_ops *ops, struct ipc_params *params) { struct kern_ipc_perm *ipcp; int flg = params->flg; int err; retry: err = idr_pre_get(&ids->ipcs_idr, GFP_KERNEL); /* * Take the lock as a writer since we are potentially going to add * a new entry + read locks are not "upgradable" */ down_write(&ids->rw_mutex); ipcp = ipc_findkey(ids, params->key); if (ipcp == NULL) { /* key not used */ if (!(flg & IPC_CREAT)) err = -ENOENT; else if (!err) err = -ENOMEM; else err = ops->getnew(ns, params); } else { /* ipc object has been locked by ipc_findkey() */ if (flg & IPC_CREAT && flg & IPC_EXCL) err = -EEXIST; else { err = 0; if (ops->more_checks) err = ops->more_checks(ipcp, params); if (!err) /* * ipc_check_perms returns the IPC id on * success */ err = ipc_check_perms(ipcp, ops, params); } ipc_unlock(ipcp); } up_write(&ids->rw_mutex); if (err == -EAGAIN) goto retry; return err; } /** * ipc_rmid - remove an IPC identifier * @ids: IPC identifier set * @ipcp: ipc perm structure containing the identifier to remove * * ipc_ids.rw_mutex (as a writer) and the spinlock for this ID are held * before this function is called, and remain locked on the exit. */ void ipc_rmid(struct ipc_ids *ids, struct kern_ipc_perm *ipcp) { int lid = ipcid_to_idx(ipcp->id); idr_remove(&ids->ipcs_idr, lid); ids->in_use--; ipcp->deleted = 1; return; } /** * ipc_alloc - allocate ipc space * @size: size desired * * Allocate memory from the appropriate pools and return a pointer to it. * NULL is returned if the allocation fails */ void* ipc_alloc(int size) { void* out; if(size > PAGE_SIZE) out = vmalloc(size); else out = kmalloc(size, GFP_KERNEL); return out; } /** * ipc_free - free ipc space * @ptr: pointer returned by ipc_alloc * @size: size of block * * Free a block created with ipc_alloc(). The caller must know the size * used in the allocation call. */ void ipc_free(void* ptr, int size) { if(size > PAGE_SIZE) vfree(ptr); else kfree(ptr); } /* * rcu allocations: * There are three headers that are prepended to the actual allocation: * - during use: ipc_rcu_hdr. * - during the rcu grace period: ipc_rcu_grace. * - [only if vmalloc]: ipc_rcu_sched. * Their lifetime doesn't overlap, thus the headers share the same memory. * Unlike a normal union, they are right-aligned, thus some container_of * forward/backward casting is necessary: */ struct ipc_rcu_hdr { int refcount; int is_vmalloc; void *data[0]; }; struct ipc_rcu_grace { struct rcu_head rcu; /* "void *" makes sure alignment of following data is sane. */ void *data[0]; }; struct ipc_rcu_sched { struct work_struct work; /* "void *" makes sure alignment of following data is sane. */ void *data[0]; }; #define HDRLEN_KMALLOC (sizeof(struct ipc_rcu_grace) > sizeof(struct ipc_rcu_hdr) ? \ sizeof(struct ipc_rcu_grace) : sizeof(struct ipc_rcu_hdr)) #define HDRLEN_VMALLOC (sizeof(struct ipc_rcu_sched) > HDRLEN_KMALLOC ? \ sizeof(struct ipc_rcu_sched) : HDRLEN_KMALLOC) static inline int rcu_use_vmalloc(int size) { /* Too big for a single page? */ if (HDRLEN_KMALLOC + size > PAGE_SIZE) return 1; return 0; } /** * ipc_rcu_alloc - allocate ipc and rcu space * @size: size desired * * Allocate memory for the rcu header structure + the object. * Returns the pointer to the object. * NULL is returned if the allocation fails. */ void* ipc_rcu_alloc(int size) { void* out; /* * We prepend the allocation with the rcu struct, and * workqueue if necessary (for vmalloc). */ if (rcu_use_vmalloc(size)) { out = vmalloc(HDRLEN_VMALLOC + size); if (out) { out += HDRLEN_VMALLOC; container_of(out, struct ipc_rcu_hdr, data)->is_vmalloc = 1; container_of(out, struct ipc_rcu_hdr, data)->refcount = 1; } } else { out = kmalloc(HDRLEN_KMALLOC + size, GFP_KERNEL); if (out) { out += HDRLEN_KMALLOC; container_of(out, struct ipc_rcu_hdr, data)->is_vmalloc = 0; container_of(out, struct ipc_rcu_hdr, data)->refcount = 1; } } return out; } void ipc_rcu_getref(void *ptr) { container_of(ptr, struct ipc_rcu_hdr, data)->refcount++; } static void ipc_do_vfree(struct work_struct *work) { vfree(container_of(work, struct ipc_rcu_sched, work)); } /** * ipc_schedule_free - free ipc + rcu space * @head: RCU callback structure for queued work * * Since RCU callback function is called in bh, * we need to defer the vfree to schedule_work(). */ static void ipc_schedule_free(struct rcu_head *head) { struct ipc_rcu_grace *grace; struct ipc_rcu_sched *sched; grace = container_of(head, struct ipc_rcu_grace, rcu); sched = container_of(&(grace->data[0]), struct ipc_rcu_sched, data[0]); INIT_WORK(&sched->work, ipc_do_vfree); schedule_work(&sched->work); } /** * ipc_immediate_free - free ipc + rcu space * @head: RCU callback structure that contains pointer to be freed * * Free from the RCU callback context. */ static void ipc_immediate_free(struct rcu_head *head) { struct ipc_rcu_grace *free = container_of(head, struct ipc_rcu_grace, rcu); kfree(free); } void ipc_rcu_putref(void *ptr) { if (--container_of(ptr, struct ipc_rcu_hdr, data)->refcount > 0) return; if (container_of(ptr, struct ipc_rcu_hdr, data)->is_vmalloc) { call_rcu(&container_of(ptr, struct ipc_rcu_grace, data)->rcu, ipc_schedule_free); } else { call_rcu(&container_of(ptr, struct ipc_rcu_grace, data)->rcu, ipc_immediate_free); } } /** * ipcperms - check IPC permissions * @ipcp: IPC permission set * @flag: desired permission set. * * Check user, group, other permissions for access * to ipc resources. return 0 if allowed */ int ipcperms (struct kern_ipc_perm *ipcp, short flag) { /* flag will most probably be 0 or S_...UGO from <linux/stat.h> */ int requested_mode, granted_mode, err; if (unlikely((err = audit_ipc_obj(ipcp)))) return err; requested_mode = (flag >> 6) | (flag >> 3) | flag; granted_mode = ipcp->mode; if (current->euid == ipcp->cuid || current->euid == ipcp->uid) granted_mode >>= 6; else if (in_group_p(ipcp->cgid) || in_group_p(ipcp->gid)) granted_mode >>= 3; /* is there some bit set in requested_mode but not in granted_mode? */ if ((requested_mode & ~granted_mode & 0007) && !capable(CAP_IPC_OWNER)) return -1; return security_ipc_permission(ipcp, flag); } /* * Functions to convert between the kern_ipc_perm structure and the * old/new ipc_perm structures */ /** * kernel_to_ipc64_perm - convert kernel ipc permissions to user * @in: kernel permissions * @out: new style IPC permissions * * Turn the kernel object @in into a set of permissions descriptions * for returning to userspace (@out). */ void kernel_to_ipc64_perm (struct kern_ipc_perm *in, struct ipc64_perm *out) { out->key = in->key; out->uid = in->uid; out->gid = in->gid; out->cuid = in->cuid; out->cgid = in->cgid; out->mode = in->mode; out->seq = in->seq; } /** * ipc64_perm_to_ipc_perm - convert new ipc permissions to old * @in: new style IPC permissions * @out: old style IPC permissions * * Turn the new style permissions object @in into a compatibility * object and store it into the @out pointer. */ void ipc64_perm_to_ipc_perm (struct ipc64_perm *in, struct ipc_perm *out) { out->key = in->key; SET_UID(out->uid, in->uid); SET_GID(out->gid, in->gid); SET_UID(out->cuid, in->cuid); SET_GID(out->cgid, in->cgid); out->mode = in->mode; out->seq = in->seq; } /** * ipc_lock - Lock an ipc structure without rw_mutex held * @ids: IPC identifier set * @id: ipc id to look for * * Look for an id in the ipc ids idr and lock the associated ipc object. * * The ipc object is locked on exit. * * This is the routine that should be called when the rw_mutex is not already * held, i.e. idr tree not protected: it protects the idr tree in read mode * during the idr_find(). */ struct kern_ipc_perm *ipc_lock(struct ipc_ids *ids, int id) { struct kern_ipc_perm *out; int lid = ipcid_to_idx(id); down_read(&ids->rw_mutex); rcu_read_lock(); out = idr_find(&ids->ipcs_idr, lid); if (out == NULL) { rcu_read_unlock(); up_read(&ids->rw_mutex); return ERR_PTR(-EINVAL); } up_read(&ids->rw_mutex); spin_lock(&out->lock); /* ipc_rmid() may have already freed the ID while ipc_lock * was spinning: here verify that the structure is still valid */ if (out->deleted) { spin_unlock(&out->lock); rcu_read_unlock(); return ERR_PTR(-EINVAL); } return out; } /** * ipc_lock_down - Lock an ipc structure with rw_sem held * @ids: IPC identifier set * @id: ipc id to look for * * Look for an id in the ipc ids idr and lock the associated ipc object. * * The ipc object is locked on exit. * * This is the routine that should be called when the rw_mutex is already * held, i.e. idr tree protected. */ struct kern_ipc_perm *ipc_lock_down(struct ipc_ids *ids, int id) { struct kern_ipc_perm *out; int lid = ipcid_to_idx(id); rcu_read_lock(); out = idr_find(&ids->ipcs_idr, lid); if (out == NULL) { rcu_read_unlock(); return ERR_PTR(-EINVAL); } spin_lock(&out->lock); /* * No need to verify that the structure is still valid since the * rw_mutex is held. */ return out; } struct kern_ipc_perm *ipc_lock_check_down(struct ipc_ids *ids, int id) { struct kern_ipc_perm *out; out = ipc_lock_down(ids, id); if (IS_ERR(out)) return out; if (ipc_checkid(out, id)) { ipc_unlock(out); return ERR_PTR(-EIDRM); } return out; } struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids, int id) { struct kern_ipc_perm *out; out = ipc_lock(ids, id); if (IS_ERR(out)) return out; if (ipc_checkid(out, id)) { ipc_unlock(out); return ERR_PTR(-EIDRM); } return out; } /** * ipcget - Common sys_*get() code * @ns : namsepace * @ids : IPC identifier set * @ops : operations to be called on ipc object creation, permission checks * and further checks * @params : the parameters needed by the previous operations. * * Common routine called by sys_msgget(), sys_semget() and sys_shmget(). */ int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids, struct ipc_ops *ops, struct ipc_params *params) { if (params->key == IPC_PRIVATE) return ipcget_new(ns, ids, ops, params); else return ipcget_public(ns, ids, ops, params); } /** * ipc_update_perm - update the permissions of an IPC. * @in: the permission given as input. * @out: the permission of the ipc to set. */ void ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out) { out->uid = in->uid; out->gid = in->gid; out->mode = (out->mode & ~S_IRWXUGO) | (in->mode & S_IRWXUGO); } /** * ipcctl_pre_down - retrieve an ipc and check permissions for some IPC_XXX cmd * @ids: the table of ids where to look for the ipc * @id: the id of the ipc to retrieve * @cmd: the cmd to check * @perm: the permission to set * @extra_perm: one extra permission parameter used by msq * * This function does some common audit and permissions check for some IPC_XXX * cmd and is called from semctl_down, shmctl_down and msgctl_down. * It must be called without any lock held and * - retrieves the ipc with the given id in the given table. * - performs some audit and permission check, depending on the given cmd * - returns the ipc with both ipc and rw_mutex locks held in case of success * or an err-code without any lock held otherwise. */ struct kern_ipc_perm *ipcctl_pre_down(struct ipc_ids *ids, int id, int cmd, struct ipc64_perm *perm, int extra_perm) { struct kern_ipc_perm *ipcp; int err; down_write(&ids->rw_mutex); ipcp = ipc_lock_check_down(ids, id); if (IS_ERR(ipcp)) { err = PTR_ERR(ipcp); goto out_up; } err = audit_ipc_obj(ipcp); if (err) goto out_unlock; if (cmd == IPC_SET) { err = audit_ipc_set_perm(extra_perm, perm->uid, perm->gid, perm->mode); if (err) goto out_unlock; } if (current->euid == ipcp->cuid || current->euid == ipcp->uid || capable(CAP_SYS_ADMIN)) return ipcp;


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