ionic: Don't send reset commands if FW isn't running

It's possible the FW is already shutting down while the driver is being
removed and/or when the driver is going through reset. This can cause
unexpected/unnecessary errors to be printed:

eth0: DEV_CMD IONIC_CMD_PORT_RESET (12) error, IONIC_RC_ERROR (29) failed
eth1: DEV_CMD IONIC_CMD_RESET (3) error, IONIC_RC_ERROR (29) failed

Fix this by checking the FW status register before issuing the reset
commands.

Also, since err may not be assigned in ionic_port_reset(), assign it a
default value of 0, and remove an unnecessary log message.

Fixes: fbfb8031533c ("ionic: Add hardware init and device commands")
Signed-off-by: Brett Creeley <brett@pensando.io>
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_dev.c b/drivers/net/ethernet/pensando/ionic/ionic_dev.c
index 34b7708..86791e0 100644 (file)
--- a/drivers/net/ethernet/pensando/ionic/ionic_dev.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.c
@@ -136,6 +136,16 @@ int ionic_dev_setup(struct ionic *ionic)
 }
 
 /* Devcmd Interface */
+bool ionic_is_fw_running(struct ionic_dev *idev)
+{
+       u8 fw_status = ioread8(&idev->dev_info_regs->fw_status);
+
+       /* firmware is useful only if the running bit is set and
+        * fw_status != 0xff (bad PCI read)
+        */
+       return (fw_status != 0xff) && (fw_status & IONIC_FW_STS_F_RUNNING);
+}
+
 int ionic_heartbeat_check(struct ionic *ionic)
 {
        struct ionic_dev *idev = &ionic->idev;
@@ -159,13 +169,10 @@ do_check_time:
                goto do_check_time;
        }
 
-       /* firmware is useful only if the running bit is set and
-        * fw_status != 0xff (bad PCI read)
-        * If fw_status is not ready don't bother with the generation.
-        */
        fw_status = ioread8(&idev->dev_info_regs->fw_status);
 
-       if (fw_status == 0xff || !(fw_status & IONIC_FW_STS_F_RUNNING)) {
+       /* If fw_status is not ready don't bother with the generation */
+       if (!ionic_is_fw_running(idev)) {
                fw_status_ready = false;
        } else {
                fw_generation = fw_status & IONIC_FW_STS_F_GENERATION;

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_dev.h b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
index e5acf3b..73b950a 100644 (file)
--- a/drivers/net/ethernet/pensando/ionic/ionic_dev.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
@@ -353,5 +353,6 @@ void ionic_q_rewind(struct ionic_queue *q, struct ionic_desc_info *start);
 void ionic_q_service(struct ionic_queue *q, struct ionic_cq_info *cq_info,
                     unsigned int stop_index);
 int ionic_heartbeat_check(struct ionic *ionic);
+bool ionic_is_fw_running(struct ionic_dev *idev);
 
 #endif /* _IONIC_DEV_H_ */

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_main.c b/drivers/net/ethernet/pensando/ionic/ionic_main.c
index a89ad76..a548f2a 100644 (file)
--- a/drivers/net/ethernet/pensando/ionic/ionic_main.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_main.c
@@ -540,6 +540,9 @@ int ionic_reset(struct ionic *ionic)
        struct ionic_dev *idev = &ionic->idev;
        int err;
 
+       if (!ionic_is_fw_running(idev))
+               return 0;
+
        mutex_lock(&ionic->dev_cmd_lock);
        ionic_dev_cmd_reset(idev);
        err = ionic_dev_cmd_wait(ionic, DEVCMD_TIMEOUT);
@@ -612,15 +615,17 @@ int ionic_port_init(struct ionic *ionic)
 int ionic_port_reset(struct ionic *ionic)
 {
        struct ionic_dev *idev = &ionic->idev;
-       int err;
+       int err = 0;
 
        if (!idev->port_info)
                return 0;
 
-       mutex_lock(&ionic->dev_cmd_lock);
-       ionic_dev_cmd_port_reset(idev);
-       err = ionic_dev_cmd_wait(ionic, DEVCMD_TIMEOUT);
-       mutex_unlock(&ionic->dev_cmd_lock);
+       if (ionic_is_fw_running(idev)) {
+               mutex_lock(&ionic->dev_cmd_lock);
+               ionic_dev_cmd_port_reset(idev);
+               err = ionic_dev_cmd_wait(ionic, DEVCMD_TIMEOUT);
+               mutex_unlock(&ionic->dev_cmd_lock);
+       }
 
        dma_free_coherent(ionic->dev, idev->port_info_sz,
                          idev->port_info, idev->port_info_pa);
@@ -628,9 +633,6 @@ int ionic_port_reset(struct ionic *ionic)
        idev->port_info = NULL;
        idev->port_info_pa = 0;
 
-       if (err)
-               dev_err(ionic->dev, "Failed to reset port\n");
-
        return err;
 }