linux-kernel - [GIT PULL] please pull infiniband.git

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Message-ID: <ada8xl4jup6.fsf@cisco.com>
Date:	Thu, 31 Aug 2006 17:29:09 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	torvalds@...l.org
Cc:	openib-general@...nib.org, linux-kernel@...r.kernel.org
Subject: [GIT PULL] please pull infiniband.git

Linus, please pull from

    master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband.git for-linus

This tree is also available from kernel.org mirrors at:

    git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband.git for-linus

to get a fix for a locking bug found by lockdep:

Roland Dreier:
      IB/mthca: Use IRQ safe locks to protect allocation bitmaps

 drivers/infiniband/hw/mthca/mthca_allocator.c |   15 +++++++++++----
 1 files changed, 11 insertions(+), 4 deletions(-)


diff --git a/drivers/infiniband/hw/mthca/mthca_allocator.c b/drivers/infiniband/hw/mthca/mthca_allocator.c
index 25157f5..f930e55 100644
--- a/drivers/infiniband/hw/mthca/mthca_allocator.c
+++ b/drivers/infiniband/hw/mthca/mthca_allocator.c
@@ -41,9 +41,11 @@ #include "mthca_dev.h"
 /* Trivial bitmap-based allocator */
 u32 mthca_alloc(struct mthca_alloc *alloc)
 {
+	unsigned long flags;
 	u32 obj;
 
-	spin_lock(&alloc->lock);
+	spin_lock_irqsave(&alloc->lock, flags);
+
 	obj = find_next_zero_bit(alloc->table, alloc->max, alloc->last);
 	if (obj >= alloc->max) {
 		alloc->top = (alloc->top + alloc->max) & alloc->mask;
@@ -56,19 +58,24 @@ u32 mthca_alloc(struct mthca_alloc *allo
 	} else
 		obj = -1;
 
-	spin_unlock(&alloc->lock);
+	spin_unlock_irqrestore(&alloc->lock, flags);
 
 	return obj;
 }
 
 void mthca_free(struct mthca_alloc *alloc, u32 obj)
 {
+	unsigned long flags;
+
 	obj &= alloc->max - 1;
-	spin_lock(&alloc->lock);
+
+	spin_lock_irqsave(&alloc->lock, flags);
+
 	clear_bit(obj, alloc->table);
 	alloc->last = min(alloc->last, obj);
 	alloc->top = (alloc->top + alloc->max) & alloc->mask;
-	spin_unlock(&alloc->lock);
+
+	spin_unlock_irqrestore(&alloc->lock, flags);
 }
 
 int mthca_alloc_init(struct mthca_alloc *alloc, u32 num, u32 mask,
-
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