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| author | Ed L. Cashin <ecashin@coraid.com> | 2008-02-08 04:20:03 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-08 09:22:31 -0800 |
| commit | cf446f0dbafb5428a551da1c0df8f56316831df8 (patch) | |
| tree | 4fac7df503878c75169d918c9002d6d8d9be4f7f /drivers/block/aoe | |
| parent | 468fc53050a81d73893ce619a62914799e8d86bb (diff) | |
| download | linux-3.10-cf446f0dbafb5428a551da1c0df8f56316831df8.tar.gz linux-3.10-cf446f0dbafb5428a551da1c0df8f56316831df8.tar.bz2 linux-3.10-cf446f0dbafb5428a551da1c0df8f56316831df8.zip | |
aoe: eliminate goto and improve readability
Adam Richter suggested eliminating this goto.
Signed-off-by: Ed L. Cashin <ecashin@coraid.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/block/aoe')
| -rw-r--r-- | drivers/block/aoe/aoechr.c | 69 |
1 files changed, 34 insertions, 35 deletions
diff --git a/drivers/block/aoe/aoechr.c b/drivers/block/aoe/aoechr.c index 03c7f4ab562..f1124664c5c 100644 --- a/drivers/block/aoe/aoechr.c +++ b/drivers/block/aoe/aoechr.c @@ -194,52 +194,51 @@ aoechr_read(struct file *filp, char __user *buf, size_t cnt, loff_t *off) ulong flags; n = (unsigned long) filp->private_data; - switch (n) { - case MINOR_ERR: - spin_lock_irqsave(&emsgs_lock, flags); -loop: - em = emsgs + emsgs_head_idx; - if ((em->flags & EMFL_VALID) == 0) { - if (filp->f_flags & O_NDELAY) { - spin_unlock_irqrestore(&emsgs_lock, flags); - return -EAGAIN; - } - nblocked_emsgs_readers++; + if (n != MINOR_ERR) + return -EFAULT; + + spin_lock_irqsave(&emsgs_lock, flags); + for (;;) { + em = emsgs + emsgs_head_idx; + if ((em->flags & EMFL_VALID) != 0) + break; + if (filp->f_flags & O_NDELAY) { spin_unlock_irqrestore(&emsgs_lock, flags); + return -EAGAIN; + } + nblocked_emsgs_readers++; + + spin_unlock_irqrestore(&emsgs_lock, flags); - n = down_interruptible(&emsgs_sema); + n = down_interruptible(&emsgs_sema); - spin_lock_irqsave(&emsgs_lock, flags); + spin_lock_irqsave(&emsgs_lock, flags); - nblocked_emsgs_readers--; + nblocked_emsgs_readers--; - if (n) { - spin_unlock_irqrestore(&emsgs_lock, flags); - return -ERESTARTSYS; - } - goto loop; - } - if (em->len > cnt) { + if (n) { spin_unlock_irqrestore(&emsgs_lock, flags); - return -EAGAIN; + return -ERESTARTSYS; } - mp = em->msg; - len = em->len; - em->msg = NULL; - em->flags &= ~EMFL_VALID; + } + if (em->len > cnt) { + spin_unlock_irqrestore(&emsgs_lock, flags); + return -EAGAIN; + } + mp = em->msg; + len = em->len; + em->msg = NULL; + em->flags &= ~EMFL_VALID; - emsgs_head_idx++; - emsgs_head_idx %= ARRAY_SIZE(emsgs); + emsgs_head_idx++; + emsgs_head_idx %= ARRAY_SIZE(emsgs); - spin_unlock_irqrestore(&emsgs_lock, flags); + spin_unlock_irqrestore(&emsgs_lock, flags); - n = copy_to_user(buf, mp, len); - kfree(mp); - return n == 0 ? len : -EFAULT; - default: - return -EFAULT; - } + n = copy_to_user(buf, mp, len); + kfree(mp); + return n == 0 ? len : -EFAULT; } static const struct file_operations aoe_fops = { |