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authorJiri Slaby <jslaby@suse.cz>2012-03-05 14:52:01 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-03-08 11:42:21 -0800
commit410235fd4d20b8feaf8930a0575d23acc088aa87 (patch)
treead21d071a29ef0ad400393328ca4ab0588d5b2b7 /drivers/tty/hvc/hvcs.c
parent44a1bfd95d0a6c0096e79a883197596e1ce83cc3 (diff)
TTY: remove unneeded tty->index checks
Checking if tty->index is in bounds is not needed. The tty has the index set in the initial open. This is done in get_tty_driver. And it can be only in interval <0,driver->num). So remove the tests which check exactly this interval. Some are left untouched as they check against the current backing device count. (Leaving apart that the check is racy in most of the cases.) Signed-off-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/hvc/hvcs.c')
-rw-r--r--drivers/tty/hvc/hvcs.c24
1 files changed, 10 insertions, 14 deletions
diff --git a/drivers/tty/hvc/hvcs.c b/drivers/tty/hvc/hvcs.c
index da0aa476804d..d23759183b47 100644
--- a/drivers/tty/hvc/hvcs.c
+++ b/drivers/tty/hvc/hvcs.c
@@ -1090,27 +1090,23 @@ static int hvcs_enable_device(struct hvcs_struct *hvcsd, uint32_t unit_address,
*/
static struct hvcs_struct *hvcs_get_by_index(int index)
{
- struct hvcs_struct *hvcsd = NULL;
+ struct hvcs_struct *hvcsd;
unsigned long flags;
spin_lock(&hvcs_structs_lock);
- /* We can immediately discard OOB requests */
- if (index >= 0 && index < HVCS_MAX_SERVER_ADAPTERS) {
- list_for_each_entry(hvcsd, &hvcs_structs, next) {
- spin_lock_irqsave(&hvcsd->lock, flags);
- if (hvcsd->index == index) {
- kref_get(&hvcsd->kref);
- spin_unlock_irqrestore(&hvcsd->lock, flags);
- spin_unlock(&hvcs_structs_lock);
- return hvcsd;
- }
+ list_for_each_entry(hvcsd, &hvcs_structs, next) {
+ spin_lock_irqsave(&hvcsd->lock, flags);
+ if (hvcsd->index == index) {
+ kref_get(&hvcsd->kref);
spin_unlock_irqrestore(&hvcsd->lock, flags);
+ spin_unlock(&hvcs_structs_lock);
+ return hvcsd;
}
- hvcsd = NULL;
+ spin_unlock_irqrestore(&hvcsd->lock, flags);
}
-
spin_unlock(&hvcs_structs_lock);
- return hvcsd;
+
+ return NULL;
}
/*