ATM: iphase, remove sleep-inside-atomic

Stanse found that ia_init_one locks a spinlock and inside of that it
calls ia_start which calls:
* request_irq
* tx_init which does kmalloc(GFP_KERNEL)

Both of them can thus sleep and result in a deadlock. I don't see a
reason to have a per-device spinlock there which is used only there
and inited right before the lock location. So remove it completely.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Chas Williams <chas@cmf.nrl.navy.mil>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 1 insertions, 7 deletions

diff --git a/drivers/atm/iphase.c b/drivers/atm/iphase.c
index ee9ddeb5341..8cb0347dec2 100644
--- a/drivers/atm/iphase.c
+++ b/drivers/atm/iphase.c
@@ -3156,7 +3156,6 @@ static int __devinit ia_init_one(struct pci_dev *pdev,
 {  
         struct atm_dev *dev;  
         IADEV *iadev;  
-        unsigned long flags;
         int ret;
 
         iadev = kzalloc(sizeof(*iadev), GFP_KERNEL);
@@ -3188,19 +3187,14 @@ static int __devinit ia_init_one(struct pci_dev *pdev,
         ia_dev[iadev_count] = iadev;
         _ia_dev[iadev_count] = dev;
         iadev_count++;
-        spin_lock_init(&iadev->misc_lock);
-        /* First fixes first. I don't want to think about this now. */
-        spin_lock_irqsave(&iadev->misc_lock, flags); 
         if (ia_init(dev) || ia_start(dev)) {  
                 IF_INIT(printk("IA register failed!\n");)
                 iadev_count--;
                 ia_dev[iadev_count] = NULL;
                 _ia_dev[iadev_count] = NULL;
-                spin_unlock_irqrestore(&iadev->misc_lock, flags); 
                 ret = -EINVAL;
                 goto err_out_deregister_dev;
         }
-        spin_unlock_irqrestore(&iadev->misc_lock, flags); 
         IF_EVENT(printk("iadev_count = %d\n", iadev_count);)
 
         iadev->next_board = ia_boards;  
diff --git a/drivers/atm/iphase.h b/drivers/atm/iphase.h
index b2cd20f549c..077735e0e04 100644
--- a/drivers/atm/iphase.h
+++ b/drivers/atm/iphase.h
@@ -1022,7 +1022,7 @@ typedef struct iadev_t {
         struct dle_q rx_dle_q;  
         struct free_desc_q *rx_free_desc_qhead;  
         struct sk_buff_head rx_dma_q;  
-        spinlock_t rx_lock, misc_lock;
+        spinlock_t rx_lock;
         struct atm_vcc **rx_open;       /* list of all open VCs */  
         u16 num_rx_desc, rx_buf_sz, rxing;
         u32 rx_pkt_ram, rx_tmp_cnt;