/* these flags denote packets that need special attention */
int empty_packet, first_packet, last_packet, mid_packet;
- u32 *branch_address, *last_branch_address = NULL;
+ __le32 *branch_address, *last_branch_address = NULL;
unsigned long data_p;
int first_packet_empty = 0;
u32 cycleTimer, ct_sec, ct_cyc, ct_off;
dma_addr_t block_dma = 0;
struct packet *data = NULL;
dma_addr_t data_dma = 0;
- u32 *last_branch_address = NULL;
+ __le32 *last_branch_address = NULL;
unsigned long irq_flags;
int want_interrupt = 0;
struct frame *f = NULL;
struct video_card *video = file_to_video_card(file);
int retval = -EINVAL;
- /* serialize mmap */
- mutex_lock(&video->mtx);
+ /*
+ * We cannot use the blocking variant mutex_lock here because .mmap
+ * is called with mmap_sem held, while .ioctl, .read, .write acquire
+ * video->mtx and subsequently call copy_to/from_user which will
+ * grab mmap_sem in case of a page fault.
+ */
+ if (!mutex_trylock(&video->mtx))
+ return -EAGAIN;
if ( ! video_card_initialized(video) ) {
retval = do_dv1394_init_default(video);
f = video->frames[next_i / MAX_PACKETS];
next = &(f->descriptor_pool[next_i % MAX_PACKETS]);
next_dma = ((unsigned long) block - (unsigned long) f->descriptor_pool) + f->descriptor_pool_dma;
- next->u.in.il.q[0] |= 3 << 20; /* enable interrupt */
- next->u.in.il.q[2] = 0; /* disable branch */
+ next->u.in.il.q[0] |= cpu_to_le32(3 << 20); /* enable interrupt */
+ next->u.in.il.q[2] = cpu_to_le32(0); /* disable branch */
/* link previous to next */
prev_i = (next_i == 0) ? (MAX_PACKETS * video->n_frames - 1) : (next_i - 1);
f = video->frames[prev_i / MAX_PACKETS];
prev = &(f->descriptor_pool[prev_i % MAX_PACKETS]);
if (prev_i % (MAX_PACKETS/2)) {
- prev->u.in.il.q[0] &= ~(3 << 20); /* no interrupt */
+ prev->u.in.il.q[0] &= ~cpu_to_le32(3 << 20); /* no interrupt */
} else {
- prev->u.in.il.q[0] |= 3 << 20; /* enable interrupt */
+ prev->u.in.il.q[0] |= cpu_to_le32(3 << 20); /* enable interrupt */
}
prev->u.in.il.q[2] = cpu_to_le32(next_dma | 1); /* set Z=1 */
wmb();