net/i40e/base: sync nvmupdate command and adminq subtask

During NVMupdate, state machine gets into unrecoverable state because
i40e_clean_adminq_subtask can get scheduled after the admin queue
command but before other state variables are updated.

This patch adds locking around admin queue command and update of
state variables so that adminq_subtask will have accurate information
whenever it gets scheduled.

Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>

diff --git a/drivers/net/i40e/base/i40e_nvm.c b/drivers/net/i40e/base/i40e_nvm.c
index e896502..90521fa 100644 (file)
--- a/drivers/net/i40e/base/i40e_nvm.c
+++ b/drivers/net/i40e/base/i40e_nvm.c
@@ -899,6 +899,11 @@ enum i40e_status_code i40e_nvmupd_command(struct i40e_hw *hw,
                hw->nvmupd_state = I40E_NVMUPD_STATE_INIT;
        }
 
+       /* Acquire lock to prevent race condition where adminq_task
+        * can execute after i40e_nvmupd_nvm_read/write but before state
+        * variables (nvm_wait_opcode, nvm_release_on_done) are updated
+        */
+       i40e_acquire_spinlock(&hw->aq.arq_spinlock);
        switch (hw->nvmupd_state) {
        case I40E_NVMUPD_STATE_INIT:
                status = i40e_nvmupd_state_init(hw, cmd, bytes, perrno);
@@ -934,6 +939,7 @@ enum i40e_status_code i40e_nvmupd_command(struct i40e_hw *hw,
                *perrno = -ESRCH;
                break;
        }
+       i40e_release_spinlock(&hw->aq.arq_spinlock);
        return status;
 }