linux-kernel - Re: [PATCH][i3c-next] i3c: master: fix mask operation by using the correct operator

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Date:   Mon, 19 Nov 2018 17:49:25 +0100
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     vitor <vitor.soares@...opsys.com>
Cc:     Colin King <colin.king@...onical.com>,
        <kernel-janitors@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][i3c-next] i3c: master: fix mask operation by using the
 correct operator

On Mon, 19 Nov 2018 12:41:10 +0000
vitor <vitor.soares@...opsys.com> wrote:

> Hi Coling,
> 
> 
> Thanks for your report.
> 
> On 16/11/18 18:42, Colin King wrote:
> > From: Colin Ian King <colin.king@...onical.com>
> >
> > The masking operation on status is using a bitwise 'or' rather than
> > a bitwise 'and' operator, and hence the result is always non-zero
> > which is probably not what is intended. Fix this by using the correct
> > operator.
> >
> > Detected by CoverityScan, CID#1475523 ("Wrong operator used")
> >
> > Fixes: 88acc98a712a ("i3c: master: Add driver for Synopsys DesignWare IP")
> > Signed-off-by: Colin Ian King <colin.king@...onical.com>
> > ---
> >   drivers/i3c/master/dw-i3c-master.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c
> > index 0153e6e9de52..b532e2c9cf5c 100644
> > --- a/drivers/i3c/master/dw-i3c-master.c
> > +++ b/drivers/i3c/master/dw-i3c-master.c
> > @@ -1085,7 +1085,7 @@ static irqreturn_t dw_i3c_master_irq_handler(int irq, void *dev_id)
> >   
> >   	spin_lock(&master->xferqueue.lock);
> >   	dw_i3c_master_end_xfer_locked(master, status);
> > -	if (status | INTR_TRANSFER_ERR_STAT)
> > +	if (status & INTR_TRANSFER_ERR_STAT)
> >   		writel(INTR_TRANSFER_ERR_STAT, master->regs + INTR_STATUS);
> >   	spin_unlock(&master->xferqueue.lock);
> >     
> Acked-by: Vitor Soares <vitor.soares@...opsys.com>

Applied.

Thanks,

Boris