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qlge: Fix deadlock when cancelling worker. 

Removing usage of rtnl_lock() to protect firmware interface registers.
These registers are accessed in some worker threads and can create a
deadlock if rtnl_lock is taken by upper layers while the worker is still
pending.
We remove rtnl_lock and use a driver mutex just while mailboxes are
accessed.

Signed-off-by: Ron Mercer <ron.mercer@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ron Mercer 2010-12-11 11:06:50 +00:00 committed by David S. Miller
parent 36eac2130c
commit 4d7b6b5d24
3 changed files with 6 additions and 8 deletions
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1
drivers/net/qlge/qlge.h
View File

@ -2083,6 +2083,7 @@ struct ql_adapter {
u32 mailbox_in;
u32 mailbox_out;
struct mbox_params idc_mbc;
struct mutex mpi_mutex;
int tx_ring_size;
int rx_ring_size;

1
drivers/net/qlge/qlge_main.c
View File

@ -4629,6 +4629,7 @@ static int __devinit ql_init_device(struct pci_dev *pdev,
INIT_DELAYED_WORK(&qdev->mpi_idc_work, ql_mpi_idc_work);
INIT_DELAYED_WORK(&qdev->mpi_core_to_log, ql_mpi_core_to_log);
init_completion(&qdev->ide_completion);
mutex_init(&qdev->mpi_mutex);
if (!cards_found) {
dev_info(&pdev->dev, "%s\n", DRV_STRING);

12
drivers/net/qlge/qlge_mpi.c
View File

@ -534,6 +534,7 @@ static int ql_mailbox_command(struct ql_adapter *qdev, struct mbox_params *mbcp)
int status;
unsigned long count;
mutex_lock(&qdev->mpi_mutex);
/* Begin polled mode for MPI */
ql_write32(qdev, INTR_MASK, (INTR_MASK_PI << 16));
@ -603,6 +604,7 @@ done:
end:
/* End polled mode for MPI */
ql_write32(qdev, INTR_MASK, (INTR_MASK_PI << 16) | INTR_MASK_PI);
mutex_unlock(&qdev->mpi_mutex);
return status;
}
@ -1099,9 +1101,7 @@ int ql_wait_fifo_empty(struct ql_adapter *qdev)
static int ql_set_port_cfg(struct ql_adapter *qdev)
{
int status;
rtnl_lock();
status = ql_mb_set_port_cfg(qdev);
rtnl_unlock();
if (status)
return status;
status = ql_idc_wait(qdev);
@ -1122,9 +1122,7 @@ void ql_mpi_port_cfg_work(struct work_struct *work)
container_of(work, struct ql_adapter, mpi_port_cfg_work.work);
int status;
rtnl_lock();
status = ql_mb_get_port_cfg(qdev);
rtnl_unlock();
if (status) {
netif_err(qdev, drv, qdev->ndev,
"Bug: Failed to get port config data.\n");
@ -1167,7 +1165,6 @@ void ql_mpi_idc_work(struct work_struct *work)
u32 aen;
int timeout;
rtnl_lock();
aen = mbcp->mbox_out[1] >> 16;
timeout = (mbcp->mbox_out[1] >> 8) & 0xf;
@ -1231,7 +1228,6 @@ void ql_mpi_idc_work(struct work_struct *work)
}
break;
}
rtnl_unlock();
}
void ql_mpi_work(struct work_struct *work)
@ -1242,7 +1238,7 @@ void ql_mpi_work(struct work_struct *work)
struct mbox_params *mbcp = &mbc;
int err = 0;
rtnl_lock();
mutex_lock(&qdev->mpi_mutex);
/* Begin polled mode for MPI */
ql_write32(qdev, INTR_MASK, (INTR_MASK_PI << 16));
@ -1259,7 +1255,7 @@ void ql_mpi_work(struct work_struct *work)
/* End polled mode for MPI */
ql_write32(qdev, INTR_MASK, (INTR_MASK_PI << 16) | INTR_MASK_PI);
rtnl_unlock();
mutex_unlock(&qdev->mpi_mutex);
ql_enable_completion_interrupt(qdev, 0);
}