xen/scsiback: add error handling for xenbus_printf
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>
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93efbd3987
Коммит
7c63ca24c8
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@ -1012,6 +1012,7 @@ static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state,
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{
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struct v2p_entry *entry;
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unsigned long flags;
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int err;
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if (try) {
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spin_lock_irqsave(&info->v2p_lock, flags);
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@ -1027,8 +1028,11 @@ static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state,
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scsiback_del_translation_entry(info, vir);
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}
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} else if (!try) {
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xenbus_printf(XBT_NIL, info->dev->nodename, state,
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err = xenbus_printf(XBT_NIL, info->dev->nodename, state,
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"%d", XenbusStateClosed);
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if (err)
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xenbus_dev_error(info->dev, err,
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"%s: writing %s", __func__, state);
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}
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}
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@ -1067,8 +1071,11 @@ static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op,
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snprintf(str, sizeof(str), "vscsi-devs/%s/p-dev", ent);
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val = xenbus_read(XBT_NIL, dev->nodename, str, NULL);
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if (IS_ERR(val)) {
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xenbus_printf(XBT_NIL, dev->nodename, state,
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err = xenbus_printf(XBT_NIL, dev->nodename, state,
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"%d", XenbusStateClosed);
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if (err)
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xenbus_dev_error(info->dev, err,
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"%s: writing %s", __func__, state);
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return;
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}
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strlcpy(phy, val, VSCSI_NAMELEN);
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@ -1079,8 +1086,11 @@ static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op,
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err = xenbus_scanf(XBT_NIL, dev->nodename, str, "%u:%u:%u:%u",
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&vir.hst, &vir.chn, &vir.tgt, &vir.lun);
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if (XENBUS_EXIST_ERR(err)) {
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xenbus_printf(XBT_NIL, dev->nodename, state,
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err = xenbus_printf(XBT_NIL, dev->nodename, state,
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"%d", XenbusStateClosed);
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if (err)
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xenbus_dev_error(info->dev, err,
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"%s: writing %s", __func__, state);
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return;
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}
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