enic: increment devcmd2 result ring in case of timeout

Firmware posts the devcmd result in result ring. In case of timeout, driver
does not increment the current result pointer and firmware could post the
result after timeout has occurred. During next devcmd, driver would be
reading the result of previous devcmd.

Fix this by incrementing result even in case of timeout.

Fixes: 373fb0873d43 ("enic: add devcmd2")
Signed-off-by: Sandeep Pillai <sanpilla@cisco.com>
Signed-off-by: Govindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Orabug: 27587345
(cherry picked from commit ca7f41a4957b872577807169bd7464b36aae9b9c)
Conflict in enic.h - avoid reverting version number
Signed-off-by: Jack Vogel <jack.vogel@oracle.com>
Reviewed-by: Kirtikar Kashyap <kirtikar.kashyap@oracle.com>

diff --git a/drivers/net/ethernet/cisco/enic/vnic_dev.c b/drivers/net/ethernet/cisco/enic/vnic_dev.c
index 4e9488e4545c5442e2558e0c69edb4091fb0ac6b..8f27df3207bc0799d78c36b8b539caef1ad84ea4 100644 (file)
--- a/drivers/net/ethernet/cisco/enic/vnic_dev.c
+++ b/drivers/net/ethernet/cisco/enic/vnic_dev.c
@@ -298,7 +298,8 @@ static int _vnic_dev_cmd2(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
                          int wait)
 {
        struct devcmd2_controller *dc2c = vdev->devcmd2;
-       struct devcmd2_result *result = dc2c->result + dc2c->next_result;
+       struct devcmd2_result *result;
+       u8 color;
        unsigned int i;
        int delay, err;
        u32 fetch_index, new_posted;
@@ -336,13 +337,17 @@ static int _vnic_dev_cmd2(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
        if (dc2c->cmd_ring[posted].flags & DEVCMD2_FNORESULT)
                return 0;
 
+       result = dc2c->result + dc2c->next_result;
+       color = dc2c->color;
+
+       dc2c->next_result++;
+       if (dc2c->next_result == dc2c->result_size) {
+               dc2c->next_result = 0;
+               dc2c->color = dc2c->color ? 0 : 1;
+       }
+
        for (delay = 0; delay < wait; delay++) {
-               if (result->color == dc2c->color) {
-                       dc2c->next_result++;
-                       if (dc2c->next_result == dc2c->result_size) {
-                               dc2c->next_result = 0;
-                               dc2c->color = dc2c->color ? 0 : 1;
-                       }
+               if (result->color == color) {
                        if (result->error) {
                                err = result->error;
                                if (err != ERR_ECMDUNKNOWN ||