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iscsi-target: Fix iscsit_start_kthreads failure OOPs

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This patch fixes a regression introduced with the following commit
in v4.0-rc1 code, where a iscsit_start_kthreads() failure triggers
a NULL pointer dereference OOPs:

    commit 88dcd2dab5
    Author: Nicholas Bellinger <[email protected]>
    Date:   Thu Feb 26 22:19:15 2015 -0800

        iscsi-target: Convert iscsi_thread_set usage to kthread.h

To address this bug, move iscsit_start_kthreads() immediately
preceeding the transmit of last login response, before signaling
a successful transition into full-feature-phase within existing
iscsi_target_do_tx_login_io() logic.

This ensures that no target-side resource allocation failures can
occur after the final login response has been successfully sent.

Also, it adds a iscsi_conn->rx_login_comp to allow the RX thread
to sleep to prevent other socket related failures until the final
iscsi_post_login_handler() call is able to complete.

Cc: Sagi Grimberg <[email protected]>
Cc: <[email protected]> # v3.10+
Signed-off-by: Nicholas Bellinger <[email protected]>
This commit is contained in:
Nicholas Bellinger 2015-07-22 23:14:19 -07:00
commit e54198657b
5 changed files with 68 additions and 33 deletions
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1
include/target/iscsi/iscsi_target_core.h
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@ -595,6 +595,7 @@ struct iscsi_conn {
int bitmap_id;
int rx_thread_active;
struct task_struct *rx_thread;
struct completion rx_login_comp;
int tx_thread_active;
struct task_struct *tx_thread;
/* list_head for session connection list */