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https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
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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>
81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
#ifndef IEEE1394_RAW1394_PRIVATE_H
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#define IEEE1394_RAW1394_PRIVATE_H
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/* header for definitions that are private to the raw1394 driver
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and not visible to user-space */
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#define RAW1394_DEVICE_MAJOR 171
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#define RAW1394_DEVICE_NAME "raw1394"
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#define RAW1394_MAX_USER_CSR_DIRS 16
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struct iso_block_store {
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atomic_t refcount;
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size_t data_size;
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quadlet_t data[0];
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};
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enum raw1394_iso_state { RAW1394_ISO_INACTIVE = 0,
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RAW1394_ISO_RECV = 1,
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RAW1394_ISO_XMIT = 2 };
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struct file_info {
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struct list_head list;
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struct mutex state_mutex;
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enum { opened, initialized, connected } state;
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unsigned int protocol_version;
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struct hpsb_host *host;
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struct list_head req_pending; /* protected by reqlists_lock */
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struct list_head req_complete; /* protected by reqlists_lock */
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spinlock_t reqlists_lock;
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wait_queue_head_t wait_complete;
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struct list_head addr_list; /* protected by host_info_lock */
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u8 __user *fcp_buffer;
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u8 notification; /* (busreset-notification) RAW1394_NOTIFY_OFF/ON */
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/* new rawiso API */
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enum raw1394_iso_state iso_state;
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struct hpsb_iso *iso_handle;
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/* User space's CSR1212 dynamic ConfigROM directories */
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struct csr1212_keyval *csr1212_dirs[RAW1394_MAX_USER_CSR_DIRS];
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/* Legacy ConfigROM update flag */
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u8 cfgrom_upd;
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};
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struct arm_addr {
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struct list_head addr_list; /* file_info list */
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u64 start, end;
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u64 arm_tag;
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u8 access_rights;
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u8 notification_options;
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u8 client_transactions;
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u64 recvb;
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u16 rec_length;
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u8 *addr_space_buffer; /* accessed by read/write/lock requests */
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};
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struct pending_request {
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struct list_head list;
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struct file_info *file_info;
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struct hpsb_packet *packet;
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struct iso_block_store *ibs;
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quadlet_t *data;
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int free_data;
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struct raw1394_request req;
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};
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struct host_info {
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struct list_head list;
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struct hpsb_host *host;
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struct list_head file_info_list; /* protected by host_info_lock */
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};
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#endif /* IEEE1394_RAW1394_PRIVATE_H */
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