mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 00:52:01 +00:00
10963ea1bd
This removes the last usage of the Big Kernel Lock from the ieee1394 stack, i.e. from raw1394's (unlocked_)ioctl and compat_ioctl. The ioctl()s don't need to take the BKL, but they need to be serialized per struct file *. In particular, accesses to ->iso_state need to be serial. We simply use a blocking mutex for this purpose because libraw1394 does not use O_NONBLOCK. In practice, there is no lock contention anyway because most if not all libraw1394 clients use a libraw1394 handle only in a single thread. mmap() also accesses ->iso_state. Until now this was unprotected against concurrent changes by ioctls. Fix this bug while we are at it. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
#ifndef IEEE1394_RAW1394_PRIVATE_H
|
|
#define IEEE1394_RAW1394_PRIVATE_H
|
|
|
|
/* header for definitions that are private to the raw1394 driver
|
|
and not visible to user-space */
|
|
|
|
#define RAW1394_DEVICE_MAJOR 171
|
|
#define RAW1394_DEVICE_NAME "raw1394"
|
|
|
|
#define RAW1394_MAX_USER_CSR_DIRS 16
|
|
|
|
struct iso_block_store {
|
|
atomic_t refcount;
|
|
size_t data_size;
|
|
quadlet_t data[0];
|
|
};
|
|
|
|
enum raw1394_iso_state { RAW1394_ISO_INACTIVE = 0,
|
|
RAW1394_ISO_RECV = 1,
|
|
RAW1394_ISO_XMIT = 2 };
|
|
|
|
struct file_info {
|
|
struct list_head list;
|
|
|
|
struct mutex state_mutex;
|
|
enum { opened, initialized, connected } state;
|
|
unsigned int protocol_version;
|
|
|
|
struct hpsb_host *host;
|
|
|
|
struct list_head req_pending; /* protected by reqlists_lock */
|
|
struct list_head req_complete; /* protected by reqlists_lock */
|
|
spinlock_t reqlists_lock;
|
|
wait_queue_head_t wait_complete;
|
|
|
|
struct list_head addr_list; /* protected by host_info_lock */
|
|
|
|
u8 __user *fcp_buffer;
|
|
|
|
u8 notification; /* (busreset-notification) RAW1394_NOTIFY_OFF/ON */
|
|
|
|
/* new rawiso API */
|
|
enum raw1394_iso_state iso_state;
|
|
struct hpsb_iso *iso_handle;
|
|
|
|
/* User space's CSR1212 dynamic ConfigROM directories */
|
|
struct csr1212_keyval *csr1212_dirs[RAW1394_MAX_USER_CSR_DIRS];
|
|
|
|
/* Legacy ConfigROM update flag */
|
|
u8 cfgrom_upd;
|
|
};
|
|
|
|
struct arm_addr {
|
|
struct list_head addr_list; /* file_info list */
|
|
u64 start, end;
|
|
u64 arm_tag;
|
|
u8 access_rights;
|
|
u8 notification_options;
|
|
u8 client_transactions;
|
|
u64 recvb;
|
|
u16 rec_length;
|
|
u8 *addr_space_buffer; /* accessed by read/write/lock requests */
|
|
};
|
|
|
|
struct pending_request {
|
|
struct list_head list;
|
|
struct file_info *file_info;
|
|
struct hpsb_packet *packet;
|
|
struct iso_block_store *ibs;
|
|
quadlet_t *data;
|
|
int free_data;
|
|
struct raw1394_request req;
|
|
};
|
|
|
|
struct host_info {
|
|
struct list_head list;
|
|
struct hpsb_host *host;
|
|
struct list_head file_info_list; /* protected by host_info_lock */
|
|
};
|
|
|
|
#endif /* IEEE1394_RAW1394_PRIVATE_H */
|