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authorRon Mercer <ron.mercer@qlogic.com>2010-12-11 14:06:50 +0300
committerDavid S. Miller <davem@davemloft.net>2010-12-13 02:02:57 +0300
commit4d7b6b5d247aa71ea27709b9eac1ba6e752fbe87 (patch)
tree0af7a055a47899bd8a6475e182628b5fb1daa5b2 /drivers
parent36eac2130cdbac08606bb2c05775e52ab79b163c (diff)
downloadlinux-4d7b6b5d247aa71ea27709b9eac1ba6e752fbe87.tar.xz
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/qlge/qlge.h1
-rw-r--r--drivers/net/qlge/qlge_main.c1
-rw-r--r--drivers/net/qlge/qlge_mpi.c12
3 files changed, 6 insertions, 8 deletions
diff --git a/drivers/net/qlge/qlge.h b/drivers/net/qlge/qlge.h
index 22821398fc63..9787dff90d3f 100644
--- a/drivers/net/qlge/qlge.h
+++ b/drivers/net/qlge/qlge.h
@@ -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;
diff --git a/drivers/net/qlge/qlge_main.c b/drivers/net/qlge/qlge_main.c
index 528eaef5308f..2555b1d34f34 100644
--- a/drivers/net/qlge/qlge_main.c
+++ b/drivers/net/qlge/qlge_main.c
@@ -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);
diff --git a/drivers/net/qlge/qlge_mpi.c b/drivers/net/qlge/qlge_mpi.c
index 0e7c7c7ee164..a2e919bcb3c6 100644
--- a/drivers/net/qlge/qlge_mpi.c
+++ b/drivers/net/qlge/qlge_mpi.c
@@ -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);
}