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drivers/tty/serial: deal with 8250_core.c uninitialized warning for good 

Every couple of months, someone sends a patch to fix:

drivers/tty/serial/8250/8250_core.c: In function 'serial_unlink_irq_chain':
drivers/tty/serial/8250/8250_core.c:1712:2: warning: 'i' may be used uninitialized in this function [-Wuninitialized]

and they in turn get a NACK for their efforts, and are told that
their compiler is broken.  This has been going on since at least
the year 2008:  https://lkml.org/lkml/2008/11/24/433

Lets add a comment, so that subsequent patches don't get as far as
the maintainers or the mailing lists.

Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paul Gortmaker 2014-02-19 15:00:13 -05:00 committed by Greg Kroah-Hartman
parent 8301bb240d
commit bd2fe272a8
1 changed files with 4 additions and 0 deletions
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4
drivers/tty/serial/8250/8250_core.c
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@ -1694,6 +1694,10 @@ static int serial_link_irq_chain(struct uart_8250_port *up)
static void serial_unlink_irq_chain(struct uart_8250_port *up)
{
/*
* yes, some broken gcc emit "warning: 'i' may be used uninitialized"
* but no, we are not going to take a patch that assigns NULL below.
*/
struct irq_info *i;
struct hlist_node *n;
struct hlist_head *h;