diff options
| author | QiaoChong <qiaochong@loongson.cn> | 2019-02-09 20:59:07 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-23 13:19:50 +0100 |
| commit | c281b04191db7963de1144e280104682d77f8536 (patch) | |
| tree | 4c0770b8d69cb1450bf496c02cb8a17da60f33d0 /drivers | |
| parent | 6e7a860f528e369c69d025c614fbd86e43c3b1ae (diff) | |
parport_pc: fix find_superio io compare code, should use equal test.
commit 21698fd57984cd28207d841dbdaa026d6061bceb upstream.
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/parport/parport_pc.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/parport/parport_pc.c b/drivers/parport/parport_pc.c index bdce0679674c..02e6485c1ed5 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; } |