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block: misc updates to blk_get_queue()

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* blk_get_queue() is peculiar in that it returns 0 on success and 1 on
  failure instead of 0 / -errno or boolean.  Update it such that it
  returns %true on success and %false on failure.

* Make sure the caller checks for the return value.

* Separate out __blk_get_queue() which doesn't check whether @q is
  dead and put it in blk.h.  This will be used later.

This patch doesn't introduce any functional changes.

Signed-off-by: Tejun Heo <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Tejun Heo 2011-12-14 00:33:38 +01:00 • committed by Jens Axboe
commit 09ac46c429
6 changed files with 13 additions and 10 deletions
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4
block/bsg.c
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@ -769,12 +769,10 @@ static struct bsg_device *bsg_add_device(struct inode *inode,
struct file *file)
{
struct bsg_device *bd;
int ret;
#ifdef BSG_DEBUG
unsigned char buf[32];
#endif
ret = blk_get_queue(rq);
if (ret)
if (!blk_get_queue(rq))
return ERR_PTR(-ENXIO);
bd = bsg_alloc_device();