[SCSI] iscsi class: fix gfp use in ping compl and host event

If a ping or host event were to occur when memory is low
we do not want to use GFP_KERNEL, because the paths
sending them cannot block for data to be written. These
paths might be needed to recover write paths. Use GFP_NOIO
instead.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index fac3173..1cf640e 100644 (file)
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -1486,7 +1486,7 @@ void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
        struct iscsi_uevent *ev;
        int len = NLMSG_SPACE(sizeof(*ev) + data_size);
 
-       skb = alloc_skb(len, GFP_KERNEL);
+       skb = alloc_skb(len, GFP_NOIO);
        if (!skb) {
                printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
                       host_no, code);
@@ -1504,7 +1504,7 @@ void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
        if (data_size)
                memcpy((char *)ev + sizeof(*ev), data, data_size);
 
-       iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
+       iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
 }
 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
 
@@ -1517,7 +1517,7 @@ void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
        struct iscsi_uevent *ev;
        int len = NLMSG_SPACE(sizeof(*ev) + data_size);
 
-       skb = alloc_skb(len, GFP_KERNEL);
+       skb = alloc_skb(len, GFP_NOIO);
        if (!skb) {
                printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
                return;
@@ -1533,7 +1533,7 @@ void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
        ev->r.ping_comp.data_size = data_size;
        memcpy((char *)ev + sizeof(*ev), data, data_size);
 
-       iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
+       iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
 }
 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);