Hi,
Sorry for the mistakes, I'll fix this in v2.
Best,
Zhouyang
2018-06-13 18:09 GMT+08:00 Finn Thain <fth...@telegraphics.com.au>:
> On Tue, 12 Jun 2018, Zhouyang Jia wrote:
>
> > When xenbus_printf fails, the lack of error-handling code may
> > cause unexpected results.
> >
> > This patch adds error-handling code after calling xenbus_printf.
> >
> > Signed-off-by: Zhouyang Jia <jiazhouyan...@gmail.com>
> > ---
> > drivers/scsi/xen-scsifront.c | 31 ++++++++++++++++++++++++-------
> > 1 file changed, 24 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/scsi/xen-scsifront.c b/drivers/scsi/xen-scsifront.c
> > index 36f59a1..3d858ac 100644
> > --- a/drivers/scsi/xen-scsifront.c
> > +++ b/drivers/scsi/xen-scsifront.c
> > @@ -654,10 +654,17 @@ static int scsifront_dev_reset_handler(struct
> scsi_cmnd *sc)
> > static int scsifront_sdev_configure(struct scsi_device *sdev)
> > {
> > struct vscsifrnt_info *info = shost_priv(sdev->host);
> > + struct xenbus_device *dev = info->dev;
> > + int err;
> >
> > - if (info && current == info->curr)
> > - xenbus_printf(XBT_NIL, info->dev->nodename,
> > + if (info && current == info->curr) {
> > + err = xenbus_printf(XBT_NIL, info->dev->nodename,
> > info->dev_state_path, "%d",
> XenbusStateConnected);
>
> The existing code checks whether 'info' is NULL before dereferencing it.
> But your patch checks for NULL after dereferencing.
>
> > + if (err) {
> > + dev_err(&dev->dev, "writing dev_state_path\n");
> > + return err;
> > + }
> > + }
> >
> > return 0;
> > }
> > @@ -665,10 +672,15 @@ static int scsifront_sdev_configure(struct
> scsi_device *sdev)
> > static void scsifront_sdev_destroy(struct scsi_device *sdev)
> > {
> > struct vscsifrnt_info *info = shost_priv(sdev->host);
> > + struct xenbus_device *dev = info->dev;
> > + int err;
> >
> > - if (info && current == info->curr)
> > - xenbus_printf(XBT_NIL, info->dev->nodename,
> > + if (info && current == info->curr) {
> > + err = xenbus_printf(XBT_NIL, info->dev->nodename,
> > info->dev_state_path, "%d",
> XenbusStateClosed);
>
> Same here.
>
> > + if (err)
> > + dev_err(&dev->dev, "writing dev_state_path\n");
> > + }
> > }
> >
> > static struct scsi_host_template scsifront_sht = {
>
> --
>
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