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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>
This commit is contained in:
Jacob Keller 2017-07-10 13:23:15 -07:00 committed by Jeff Kirsher
parent 0b40f45748
commit b4fcd43661
2 changed files with 8 additions and 10 deletions
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15
drivers/net/ethernet/intel/fm10k/fm10k.h
View File

@ -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 */

3
drivers/net/ethernet/intel/fm10k/fm10k_pci.c
View File

@ -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);