video1394: remove BKL contention
video1394 does not need to take the BKL. The data structures shared between file_operations and interrupts are already protected through context-specific spinlocks. The only other danger is video1394_release() being called during another operation, however this cannot happen because release is only ever invoked when the last thread has closed the fd. Signed-off-by: Daniel Drake <ddrake@brontes3d.com> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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@ -714,7 +714,7 @@ static inline unsigned video1394_buffer_state(struct dma_iso_ctx *d,
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return ret;
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}
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static int __video1394_ioctl(struct file *file,
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static long video1394_ioctl(struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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struct file_ctx *ctx = (struct file_ctx *)file->private_data;
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@ -1158,15 +1158,6 @@ static int __video1394_ioctl(struct file *file,
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}
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}
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static long video1394_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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int err;
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lock_kernel();
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err = __video1394_ioctl(file, cmd, arg);
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unlock_kernel();
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return err;
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}
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/*
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* This maps the vmalloced and reserved buffer to user space.
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*
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@ -1179,17 +1170,14 @@ static long video1394_ioctl(struct file *file, unsigned int cmd, unsigned long a
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static int video1394_mmap(struct file *file, struct vm_area_struct *vma)
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{
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struct file_ctx *ctx = (struct file_ctx *)file->private_data;
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int res = -EINVAL;
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lock_kernel();
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if (ctx->current_ctx == NULL) {
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PRINT(KERN_ERR, ctx->ohci->host->id,
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"Current iso context not set");
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} else
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res = dma_region_mmap(&ctx->current_ctx->dma, file, vma);
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unlock_kernel();
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return -EINVAL;
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}
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return res;
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return dma_region_mmap(&ctx->current_ctx->dma, file, vma);
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}
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static unsigned int video1394_poll(struct file *file, poll_table *pt)
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@ -1200,14 +1188,12 @@ static unsigned int video1394_poll(struct file *file, poll_table *pt)
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struct dma_iso_ctx *d;
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int i;
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lock_kernel();
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ctx = file->private_data;
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d = ctx->current_ctx;
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if (d == NULL) {
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PRINT(KERN_ERR, ctx->ohci->host->id,
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"Current iso context not set");
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mask = POLLERR;
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goto done;
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return POLLERR;
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}
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poll_wait(file, &d->waitq, pt);
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@ -1220,8 +1206,6 @@ static unsigned int video1394_poll(struct file *file, poll_table *pt)
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}
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}
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spin_unlock_irqrestore(&d->lock, flags);
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done:
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unlock_kernel();
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return mask;
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}
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@ -1257,7 +1241,6 @@ static int video1394_release(struct inode *inode, struct file *file)
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struct list_head *lh, *next;
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u64 mask;
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lock_kernel();
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list_for_each_safe(lh, next, &ctx->context_list) {
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struct dma_iso_ctx *d;
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d = list_entry(lh, struct dma_iso_ctx, link);
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@ -1278,7 +1261,6 @@ static int video1394_release(struct inode *inode, struct file *file)
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kfree(ctx);
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file->private_data = NULL;
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unlock_kernel();
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return 0;
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}
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