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| author | Ariel Nahum <arieln@mellanox.com> | 2015-09-03 18:49:55 +0200 |
|---|---|---|
| committer | James Bottomley <JBottomley@Odin.com> | 2015-09-17 16:25:02 +0200 |
| commit | 52f5664a87474894e7da44f3b778dbe4e4c740b7 (patch) | |
| tree | 5584c2387542cb4f3c9e89b8f3f01bc6f590eea7 /drivers | |
| parent | Linux 4.3-rc1 (diff) | |
| download | linux-52f5664a87474894e7da44f3b778dbe4e4c740b7.tar.xz linux-52f5664a87474894e7da44f3b778dbe4e4c740b7.zip | |
libiscsi: Fix iscsi_check_transport_timeouts possible infinite loop
Connection last_ping is not being updated when iscsi_send_nopout fails.
Not updating the last_ping will cause firing a timer to a past time
(last_ping + ping_tmo < current_time) which triggers an infinite loop of
iscsi_check_transport_timeouts() and hogs the cpu.
Fix this issue by checking the return value of iscsi_send_nopout.
If it fails set the next_timeout to one second later.
Signed-off-by: Ariel Nahum <arieln@mellanox.com>
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/scsi/libiscsi.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c index 33c74d3436c9..6bffd91b973a 100644 --- a/drivers/scsi/libiscsi.c +++ b/drivers/scsi/libiscsi.c @@ -976,13 +976,13 @@ static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) wake_up(&conn->ehwait); } -static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) +static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) { struct iscsi_nopout hdr; struct iscsi_task *task; if (!rhdr && conn->ping_task) - return; + return -EINVAL; memset(&hdr, 0, sizeof(struct iscsi_nopout)); hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; @@ -996,13 +996,16 @@ static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) hdr.ttt = RESERVED_ITT; task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); - if (!task) + if (!task) { iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); - else if (!rhdr) { + return -EIO; + } else if (!rhdr) { /* only track our nops */ conn->ping_task = task; conn->last_ping = jiffies; } + + return 0; } static int iscsi_nop_out_rsp(struct iscsi_task *task, @@ -2092,8 +2095,10 @@ static void iscsi_check_transport_timeouts(unsigned long data) if (time_before_eq(last_recv + recv_timeout, jiffies)) { /* send a ping to try to provoke some traffic */ ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); - iscsi_send_nopout(conn, NULL); - next_timeout = conn->last_ping + (conn->ping_timeout * HZ); + if (iscsi_send_nopout(conn, NULL)) + next_timeout = jiffies + (1 * HZ); + else + next_timeout = conn->last_ping + (conn->ping_timeout * HZ); } else next_timeout = last_recv + recv_timeout; |