tg3: Release tp->lock before invoking synchronize_irq()

synchronize_irq() can sleep waiting, for pending IRQ handlers so driver
should release the tp->lock spin lock before invoking synchronize_irq()

Reported-by: Peter Hurley <peter@hurleysoftware.com>
Tested-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Prashant Sreedharan <prashant@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 9247ae1412cc..96bf01ba32dd 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -7413,6 +7413,8 @@ static inline void tg3_netif_start(struct tg3 *tp)
 }
 
 static void tg3_irq_quiesce(struct tg3 *tp)
+        __releases(tp->lock)
+        __acquires(tp->lock)
 {
         int i;
 
@@ -7421,8 +7423,12 @@ static void tg3_irq_quiesce(struct tg3 *tp)
         tp->irq_sync = 1;
         smp_mb();
 
+        spin_unlock_bh(&tp->lock);
+
         for (i = 0; i < tp->irq_cnt; i++)
                 synchronize_irq(tp->napi[i].irq_vec);
+
+        spin_lock_bh(&tp->lock);
 }
 
 /* Fully shutdown all tg3 driver activity elsewhere in the system.
@@ -9018,6 +9024,8 @@ static void tg3_restore_clk(struct tg3 *tp)
 
 /* tp->lock is held. */
 static int tg3_chip_reset(struct tg3 *tp)
+        __releases(tp->lock)
+        __acquires(tp->lock)
 {
         u32 val;
         void (*write_op)(struct tg3 *, u32, u32);
@@ -9073,9 +9081,13 @@ static int tg3_chip_reset(struct tg3 *tp)
         }
         smp_mb();
 
+        tg3_full_unlock(tp);
+
         for (i = 0; i < tp->irq_cnt; i++)
                 synchronize_irq(tp->napi[i].irq_vec);
 
+        tg3_full_lock(tp, 0);
+
         if (tg3_asic_rev(tp) == ASIC_REV_57780) {
                 val = tr32(TG3_PCIE_LNKCTL) & ~TG3_PCIE_LNKCTL_L1_PLL_PD_EN;
                 tw32(TG3_PCIE_LNKCTL, val | TG3_PCIE_LNKCTL_L1_PLL_PD_DIS);