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locking fixups:

Browse source 
o correct recursive locking when polling and in em_82547_move_tail
o destroy mutex on detach
o add EM_LOCK_ASSERT and similar macros for creating+deleteing the mtx

Submitted by:	Daniel Eischen <eischen@vigrid.com>
This commit is contained in:
Sam Leffler 2003-10-10 23:14:21 +00:00
parent 6728a38bf2
commit 7f59ff24d8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=120989
2 changed files with 14 additions and 9 deletions
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15
sys/dev/em/if_em.c
View file

@ -301,8 +301,7 @@ em_attach(device_t dev)
adapter->dev = dev;
adapter->osdep.dev = dev;
adapter->unit = device_get_unit(dev);
mtx_init(&adapter->mtx, device_get_nameunit(dev),
MTX_NETWORK_LOCK, MTX_DEF);
EM_LOCK_INIT(adapter, device_get_nameunit(dev));
if (em_adapter_list != NULL)
em_adapter_list->prev = adapter;
@ -562,6 +561,8 @@ em_detach(device_t dev)
if (adapter->prev != NULL)
adapter->prev->next = adapter->next;
EM_LOCK_DESTROY(adapter);
ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
ifp->if_timer = 0;
@ -933,7 +934,7 @@ em_intr(void *arg)
if (ether_poll_register(em_poll, ifp)) {
em_disable_intr(adapter);
em_poll(ifp, 0, 1);
em_poll_locked(ifp, 0, 1);
EM_UNLOCK(adapter);
return;
}
@ -1299,7 +1300,7 @@ em_encap(struct adapter *adapter, struct mbuf *m_head)
* 82547 workaround to avoid controller hang in half-duplex environment.
* The workaround is to avoid queuing a large packet that would span
* the internal Tx FIFO ring boundary. We need to reset the FIFO pointers
* in this case. We do that only when FIFO is queiced.
* in this case. We do that only when FIFO is quiescent.
*
**********************************************************************/
static void
@ -1312,7 +1313,8 @@ em_82547_move_tail(void *arg)
uint16_t length = 0;
boolean_t eop = 0;
EM_LOCK(adapter);
EM_LOCK_ASSERT(adapter);
hw_tdt = E1000_READ_REG(&adapter->hw, TDT);
sw_tdt = adapter->next_avail_tx_desc;
@ -1335,7 +1337,6 @@ em_82547_move_tail(void *arg)
length = 0;
}
}
EM_UNLOCK(adapter);
return;
}
@ -1702,7 +1703,7 @@ em_allocate_pci_resources(struct adapter * adapter)
return(ENXIO);
}
if (bus_setup_intr(dev, adapter->res_interrupt,
INTR_TYPE_NET /*| INTR_MPSAFE*/,
INTR_TYPE_NET | INTR_MPSAFE,
(void (*)(void *)) em_intr, adapter,
&adapter->int_handler_tag)) {
printf("em%d: Error registering interrupt handler!\n",

8
sys/dev/em/if_em.h
View file

@ -425,7 +425,11 @@ struct adapter {
struct em_hw_stats stats;
};
#define EM_LOCK(_sc) mtx_lock(&(_sc)->mtx)
#define EM_UNLOCK(_sc) mtx_unlock(&(_sc)->mtx)
#define EM_LOCK_INIT(_sc, _name) \
mtx_init(&(_sc)->mtx, _name, MTX_NETWORK_LOCK, MTX_DEF)
#define EM_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->mtx)
#define EM_LOCK(_sc) mtx_lock(&(_sc)->mtx)
#define EM_UNLOCK(_sc) mtx_unlock(&(_sc)->mtx)
#define EM_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->mtx, MA_OWNED)
#endif /* _EM_H_DEFINED_ */