[TG3]: Refine nvram locking

Add nvram lock count so that calls to tg3_nvram_lock()/unlock() can
be nested. Add error checking to all callers of tg3_nvram_lock()
where appropriate. To prevent nvram lock failures after halting the
firmware, it is also necessary to release firmware's nvram lock in
tg3_halt_cpu().

Update version to 3.48.

Based on David Miller's initial patch.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index 890e1635996b..e8243305f0e8 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -2275,6 +2275,7 @@ struct tg3 {
         dma_addr_t                      stats_mapping;
         struct work_struct              reset_task;
 
+        int                             nvram_lock_cnt;
         u32                             nvram_size;
         u32                             nvram_pagesize;
         u32                             nvram_jedecnum;