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[SCSI] sg: remove while (1) non-loop 

The while (1) construct isn't actually a loop at all.  So let's not
pretent and obfuscate the code.

Signed-off-by: Joern Engel <joern@logfs.org>
Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Jörn Engel 2012-04-12 17:32:48 -04:00 committed by James Bottomley
parent dddbf8d908
commit 794c10fa0f
1 changed files with 22 additions and 30 deletions
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52
drivers/scsi/sg.c
View File

@ -398,19 +398,15 @@ sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
retval = -EAGAIN;
goto free_old_hdr;
}
while (1) {
retval = 0; /* following macro beats race condition */
__wait_event_interruptible(sfp->read_wait,
(sdp->detached ||
(srp = sg_get_rq_mark(sfp, req_pack_id))),
retval);
if (sdp->detached) {
retval = -ENODEV;
goto free_old_hdr;
}
if (0 == retval)
break;
retval = 0; /* following macro beats race condition */
__wait_event_interruptible(sfp->read_wait,
(sdp->detached ||
(srp = sg_get_rq_mark(sfp, req_pack_id))), retval);
if (sdp->detached) {
retval = -ENODEV;
goto free_old_hdr;
}
if (retval) {
/* -ERESTARTSYS as signal hit process */
goto free_old_hdr;
}
@ -801,25 +797,21 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1, read_only, 1, &srp);
if (result < 0)
return result;
while (1) {
result = 0; /* following macro to beat race condition */
__wait_event_interruptible(sfp->read_wait,
(srp->done || sdp->detached),
result);
if (sdp->detached)
return -ENODEV;
write_lock_irq(&sfp->rq_list_lock);
if (srp->done) {
srp->done = 2;
write_unlock_irq(&sfp->rq_list_lock);
break;
}
srp->orphan = 1;
result = 0; /* following macro to beat race condition */
__wait_event_interruptible(sfp->read_wait,
(srp->done || sdp->detached), result);
if (sdp->detached)
return -ENODEV;
write_lock_irq(&sfp->rq_list_lock);
if (srp->done) {
srp->done = 2;
write_unlock_irq(&sfp->rq_list_lock);
return result; /* -ERESTARTSYS because signal hit process */
result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
return (result < 0) ? result : 0;
}
result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
return (result < 0) ? result : 0;
srp->orphan = 1;
write_unlock_irq(&sfp->rq_list_lock);
return result; /* -ERESTARTSYS because signal hit process */
case SG_SET_TIMEOUT:
result = get_user(val, ip);
if (result)