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| author | QiaoChong <qiaochong@loongson.cn> | 2019-02-09 20:59:07 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-23 14:35:24 +0100 |
| commit | 89541fbb582889cfe2c1ee9524b5fe12ed0a61a7 (patch) | |
| tree | 2dec74ed314f11d2b0a34ac9afcfb39662262ad6 /drivers/parport | |
| parent | c31c530c051db1e807f4b37cfd7dc179b9af3d09 (diff) | |
| download | linux-rt-89541fbb582889cfe2c1ee9524b5fe12ed0a61a7.tar.gz | |
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/parport')
| -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 380916bff9e0..dee5b9e35ffd 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; } |