linux-kernel - [PATCH 1/2] ib/ehca: Do not turn off irqs in tasklet context

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Date:	Wed, 27 Jan 2010 18:01:56 +0100
From:	Alexander Schmidt <alexs@...ux.vnet.ibm.com>
To:	Roland Dreier <rdreier@...co.com>,
	Linux RDMA <linux-rdma@...r.kernel.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Stefan Roscher <stefan.roscher@...ibm.com>,
	Joachim Fenkes <fenkes@...ibm.com>,
	Christoph Raisch <raisch@...ibm.com>,
	Hoang-Nam Nguyen <HNGUYEN@...ux.vnet.ibm.com>,
	David Wilder <wilder@...ibm.com>
Subject: [PATCH 1/2] ib/ehca: Do not turn off irqs in tasklet context

The irq_spinlock is only taken in tasklet context, so it is safe not to
disable hardware interrupts.

Signed-off-by: Alexander Schmidt <alexs@...ux.vnet.ibm.com>
---
 drivers/infiniband/hw/ehca/ehca_irq.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- linux-2.6.orig/drivers/infiniband/hw/ehca/ehca_irq.c
+++ linux-2.6/drivers/infiniband/hw/ehca/ehca_irq.c
@@ -548,11 +548,10 @@ void ehca_process_eq(struct ehca_shca *s
 	struct ehca_eq *eq = &shca->eq;
 	struct ehca_eqe_cache_entry *eqe_cache = eq->eqe_cache;
 	u64 eqe_value, ret;
-	unsigned long flags;
 	int eqe_cnt, i;
 	int eq_empty = 0;
 
-	spin_lock_irqsave(&eq->irq_spinlock, flags);
+	spin_lock(&eq->irq_spinlock);
 	if (is_irq) {
 		const int max_query_cnt = 100;
 		int query_cnt = 0;
@@ -643,7 +642,7 @@ void ehca_process_eq(struct ehca_shca *s
 	} while (1);
 
 unlock_irq_spinlock:
-	spin_unlock_irqrestore(&eq->irq_spinlock, flags);
+	spin_unlock(&eq->irq_spinlock);
 }
 
 void ehca_tasklet_eq(unsigned long data)
--
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