ionic: fix fw_status read

The fw_status field is only 8 bits, so fix the read.  Also,
we only want to look at the one status bit, to allow for future
use of the other bits, and watch for a bad PCI read.

Fixes: 97ca486592c0 ("ionic: add heartbeat check")
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 87f82f3..46107de 100644 (file)
--- a/drivers/net/ethernet/pensando/ionic/ionic_dev.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.c
@@ -103,7 +103,7 @@ int ionic_heartbeat_check(struct ionic *ionic)
 {
        struct ionic_dev *idev = &ionic->idev;
        unsigned long hb_time;
-       u32 fw_status;
+       u8 fw_status;
        u32 hb;
 
        /* wait a little more than one second before testing again */
@@ -111,9 +111,12 @@ int ionic_heartbeat_check(struct ionic *ionic)
        if (time_before(hb_time, (idev->last_hb_time + ionic->watchdog_period)))
                return 0;
 
-       /* firmware is useful only if fw_status is non-zero */
-       fw_status = ioread32(&idev->dev_info_regs->fw_status);
-       if (!fw_status)
+       /* firmware is useful only if the running bit is set and
+        * fw_status != 0xff (bad PCI read)
+        */
+       fw_status = ioread8(&idev->dev_info_regs->fw_status);
+       if (fw_status == 0xff ||
+           !(fw_status & IONIC_FW_STS_F_RUNNING))
                return -ENXIO;
 
        /* early FW has no heartbeat, else FW will return non-zero */

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_if.h b/drivers/net/ethernet/pensando/ionic/ionic_if.h
index ce07c29..54547d5 100644 (file)
--- a/drivers/net/ethernet/pensando/ionic/ionic_if.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_if.h
@@ -2445,6 +2445,7 @@ union ionic_dev_info_regs {
                u8     version;
                u8     asic_type;
                u8     asic_rev;
+#define IONIC_FW_STS_F_RUNNING 0x1
                u8     fw_status;
                u32    fw_heartbeat;
                char   fw_version[IONIC_DEVINFO_FWVERS_BUFLEN];