fm10k: use spinlock to implement mailbox lock

Lets not re-invent the locking wheel. Remove our bitlock and use
a proper spinlock instead.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/fm10k/fm10k.h b/drivers/net/ethernet/intel/fm10k/fm10k.h
index ba70c58..74542e9 100644 (file)
--- a/drivers/net/ethernet/intel/fm10k/fm10k.h
+++ b/drivers/net/ethernet/intel/fm10k/fm10k.h
@@ -276,7 +276,6 @@ enum fm10k_state_t {
        __FM10K_SERVICE_SCHED,
        __FM10K_SERVICE_REQUEST,
        __FM10K_SERVICE_DISABLE,
-       __FM10K_MBX_LOCK,
        __FM10K_LINK_DOWN,
        __FM10K_UPDATING_STATS,
        /* This value must be last and determines the BITMAP size */
@@ -346,6 +345,8 @@ struct fm10k_intfc {
 
        struct fm10k_hw_stats stats;
        struct fm10k_hw hw;
+       /* Mailbox lock */
+       spinlock_t mbx_lock;
        u32 __iomem *uc_addr;
        u32 __iomem *sw_addr;
        u16 msg_enable;
@@ -386,23 +387,17 @@ struct fm10k_intfc {
 
 static inline void fm10k_mbx_lock(struct fm10k_intfc *interface)
 {
-       /* busy loop if we cannot obtain the lock as some calls
-        * such as ndo_set_rx_mode may be made in atomic context
-        */
-       while (test_and_set_bit(__FM10K_MBX_LOCK, interface->state))
-               udelay(20);
+       spin_lock(&interface->mbx_lock);
 }
 
 static inline void fm10k_mbx_unlock(struct fm10k_intfc *interface)
 {
-       /* flush memory to make sure state is correct */
-       smp_mb__before_atomic();
-       clear_bit(__FM10K_MBX_LOCK, interface->state);
+       spin_unlock(&interface->mbx_lock);
 }
 
 static inline int fm10k_mbx_trylock(struct fm10k_intfc *interface)
 {
-       return !test_and_set_bit(__FM10K_MBX_LOCK, interface->state);
+       return spin_trylock(&interface->mbx_lock);
 }
 
 /* fm10k_test_staterr - test bits in Rx descriptor status and error fields */

diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
index 4e5e3e6..240772a 100644 (file)
--- a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
@@ -1921,6 +1921,9 @@ static int fm10k_sw_init(struct fm10k_intfc *interface,
        netdev_rss_key_fill(rss_key, sizeof(rss_key));
        memcpy(interface->rssrk, rss_key, sizeof(rss_key));
 
+       /* Initialize the mailbox lock */
+       spin_lock_init(&interface->mbx_lock);
+
        /* Start off interface as being down */
        set_bit(__FM10K_DOWN, interface->state);
        set_bit(__FM10K_UPDATING_STATS, interface->state);