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authorDaniel Drake <ddrake@brontes3d.com>2006-10-20 17:56:01 +0400
committerStefan Richter <stefanr@s5r6.in-berlin.de>2006-12-07 23:31:25 +0300
commit75dcf5dc5a0dc4e895944368780cc2fc40008a55 (patch)
treee4fdb1e7515107bbff0543a7edbbdcfff7d87dbc /drivers/ieee1394
parent3c21cfc4babaf4d20384f6f70def308e9b945159 (diff)
downloadlinux-75dcf5dc5a0dc4e895944368780cc2fc40008a55.tar.xz
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>
Diffstat (limited to 'drivers/ieee1394')
-rw-r--r--drivers/ieee1394/video1394.c30
1 files changed, 6 insertions, 24 deletions
diff --git a/drivers/ieee1394/video1394.c b/drivers/ieee1394/video1394.c
index 776b6618e80e..77f58bc83135 100644
--- a/drivers/ieee1394/video1394.c
+++ b/drivers/ieee1394/video1394.c
@@ -714,8 +714,8 @@ static inline unsigned video1394_buffer_state(struct dma_iso_ctx *d,
return ret;
}
-static int __video1394_ioctl(struct file *file,
- unsigned int cmd, unsigned long arg)
+static long video1394_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
{
struct file_ctx *ctx = (struct file_ctx *)file->private_data;
struct ti_ohci *ohci = ctx->ohci;
@@ -1158,15 +1158,6 @@ static int __video1394_ioctl(struct file *file,
}
}
-static long video1394_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
- int err;
- lock_kernel();
- err = __video1394_ioctl(file, cmd, arg);
- unlock_kernel();
- return err;
-}
-
/*
* This maps the vmalloced and reserved buffer to user space.
*
@@ -1179,17 +1170,14 @@ static long video1394_ioctl(struct file *file, unsigned int cmd, unsigned long a
static int video1394_mmap(struct file *file, struct vm_area_struct *vma)
{
struct file_ctx *ctx = (struct file_ctx *)file->private_data;
- int res = -EINVAL;
- lock_kernel();
if (ctx->current_ctx == NULL) {
PRINT(KERN_ERR, ctx->ohci->host->id,
"Current iso context not set");
- } else
- res = dma_region_mmap(&ctx->current_ctx->dma, file, vma);
- unlock_kernel();
+ return -EINVAL;
+ }
- return res;
+ return dma_region_mmap(&ctx->current_ctx->dma, file, vma);
}
static unsigned int video1394_poll(struct file *file, poll_table *pt)
@@ -1200,14 +1188,12 @@ static unsigned int video1394_poll(struct file *file, poll_table *pt)
struct dma_iso_ctx *d;
int i;
- lock_kernel();
ctx = file->private_data;
d = ctx->current_ctx;
if (d == NULL) {
PRINT(KERN_ERR, ctx->ohci->host->id,
"Current iso context not set");
- mask = POLLERR;
- goto done;
+ return POLLERR;
}
poll_wait(file, &d->waitq, pt);
@@ -1220,8 +1206,6 @@ static unsigned int video1394_poll(struct file *file, poll_table *pt)
}
}
spin_unlock_irqrestore(&d->lock, flags);
-done:
- unlock_kernel();
return mask;
}
@@ -1257,7 +1241,6 @@ static int video1394_release(struct inode *inode, struct file *file)
struct list_head *lh, *next;
u64 mask;
- lock_kernel();
list_for_each_safe(lh, next, &ctx->context_list) {
struct dma_iso_ctx *d;
d = list_entry(lh, struct dma_iso_ctx, link);
@@ -1278,7 +1261,6 @@ static int video1394_release(struct inode *inode, struct file *file)
kfree(ctx);
file->private_data = NULL;
- unlock_kernel();
return 0;
}