[PATCH 2/2] parport_pc: fix find_superio io compare code, should use equal test.

From: Sudip Mukherjee
Date: Sat Feb 09 2019 - 15:59:24 EST

From: QiaoChong <qiaochong@xxxxxxxxxxx>

In the original code before 181bf1e815a2 the loop was continuing until
it finds the first matching superios[i].io and p->base.
But after 181bf1e815a2 the logic changed and the loop now returns the
pointer to the first mismatched array element which is then used in
get_superio_dma() and get_superio_irq() and thus returning the wrong
Fix the condition so that it now returns the correct pointer.

Fixes: 181bf1e815a2 ("parport_pc: clean up the modified while loops using for")
Cc: Alan Cox <alan@xxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: QiaoChong <qiaochong@xxxxxxxxxxx>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx>
[rewrite the commit message]
drivers/parport/parport_pc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/parport/parport_pc.c b/drivers/parport/parport_pc.c
index 9c8249f74479..6296dbb83d47 100644
--- a/drivers/parport/parport_pc.c
+++ b/drivers/parport/parport_pc.c
@@ -1377,7 +1377,7 @@ static struct superio_struct *find_superio(struct parport *p)
int i;
for (i = 0; i < NR_SUPERIOS; i++)
- if (superios[i].io != p->base)
+ if (superios[i].io == p->base)
return &superios[i];
return NULL;