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scsi: xen-scsifront: add error handling for xenbus_printf

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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 <jiazhouyang09@gmail.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Zhouyang Jia 2018-06-16 01:05:01 +08:00 committed by Juergen Gross
parent 6e3cc2a6e2
commit 93efbd3987
1 changed files with 26 additions and 7 deletions
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33
drivers/scsi/xen-scsifront.c
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@ -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);
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);
if (err) {
xenbus_dev_error(info->dev, err,
"%s: writing dev_state_path", __func__);
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);
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);
if (err)
xenbus_dev_error(info->dev, err,
"%s: writing dev_state_path", __func__);
}
}
static struct scsi_host_template scsifront_sht = {
@ -1003,9 +1015,12 @@ static void scsifront_do_lun_hotplug(struct vscsifrnt_info *info, int op)
if (scsi_add_device(info->host, chn, tgt, lun)) {
dev_err(&dev->dev, "scsi_add_device\n");
xenbus_printf(XBT_NIL, dev->nodename,
err = xenbus_printf(XBT_NIL, dev->nodename,
info->dev_state_path,
"%d", XenbusStateClosed);
if (err)
xenbus_dev_error(dev, err,
"%s: writing dev_state_path", __func__);
}
break;
case VSCSIFRONT_OP_DEL_LUN:
@ -1019,10 +1034,14 @@ static void scsifront_do_lun_hotplug(struct vscsifrnt_info *info, int op)
}
break;
case VSCSIFRONT_OP_READD_LUN:
if (device_state == XenbusStateConnected)
xenbus_printf(XBT_NIL, dev->nodename,
if (device_state == XenbusStateConnected) {
err = xenbus_printf(XBT_NIL, dev->nodename,
info->dev_state_path,
"%d", XenbusStateConnected);
if (err)
xenbus_dev_error(dev, err,
"%s: writing dev_state_path", __func__);
}
break;
default:
break;