From 21698fd57984cd28207d841dbdaa026d6061bceb Mon Sep 17 00:00:00 2001
From: QiaoChong <qiaochong@loongson.cn>
Date: Sat, 9 Feb 2019 20:59:07 +0000
Subject: [PATCH] parport_pc: fix find_superio io compare code, should use
equal test.
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
value.
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@linux.intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: QiaoChong <qiaochong@loongson.cn>
[rewrite the commit message]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
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 9c8249f744792..6296dbb83d470 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;
}
--
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