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serial: drivers/serial/pmac_zilog.c: add missing unlock 

In an error handling case the lock is not unlocked.

A simplified version of the semantic patch that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@r exists@
expression E1;
identifier f;
@@

f (...) { <+...
* spin_lock_irqsave (E1,...);
... when != E1
* return ...;
...+> }
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Julia Lawall 2010-04-27 14:05:20 -07:00 committed by Greg Kroah-Hartman
parent d9901660b5
commit c61fae964a
1 changed files with 3 additions and 1 deletions
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4
drivers/serial/pmac_zilog.c
View File

@ -752,8 +752,10 @@ static void pmz_break_ctl(struct uart_port *port, int break_state)
uap->curregs[R5] = new_reg;
/* NOTE: Not subject to 'transmitter active' rule. */
if (ZS_IS_ASLEEP(uap))
if (ZS_IS_ASLEEP(uap)) {
spin_unlock_irqrestore(&port->lock, flags);
return;
}
write_zsreg(uap, R5, uap->curregs[R5]);
}