linux-kernel - [PATCH] ata: fix sleep-while-holding-spinlock in sata

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Date:	Tue, 20 May 2008 15:58:47 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	<linux-ide@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH] ata: fix sleep-while-holding-spinlock in sata_nv


From: Arjan van de Ven <arjan@...ux.intel.com>
Subject: [PATCH] ata: fix sleep-while-holding-spinlock in sata_nv

blk_queue_bounce_limit() is a sleeping function, so reorganize
the code a little to not call it while holding a spinlock.

Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
---
 drivers/ata/sata_nv.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/ata/sata_nv.c b/drivers/ata/sata_nv.c
index 858f706..a7bc56d 100644
--- a/drivers/ata/sata_nv.c
+++ b/drivers/ata/sata_nv.c
@@ -671,6 +671,11 @@ static int nv_adma_slave_config(struct scsi_device *sdev)
 	port1 = ap->host->ports[1]->private_data;
 	sdev0 = ap->host->ports[0]->link.device[0].sdev;
 	sdev1 = ap->host->ports[1]->link.device[0].sdev;
+
+	blk_queue_segment_boundary(sdev->request_queue, segment_boundary);
+	blk_queue_max_hw_segments(sdev->request_queue, sg_tablesize);
+	spin_unlock_irqrestore(ap->lock, flags);
+
 	if ((port0->flags & NV_ADMA_ATAPI_SETUP_COMPLETE) ||
 	    (port1->flags & NV_ADMA_ATAPI_SETUP_COMPLETE)) {
 		/** We have to set the DMA mask to 32-bit if either port is in
@@ -701,14 +706,11 @@ static int nv_adma_slave_config(struct scsi_device *sdev)
 					       pp->adma_dma_mask);
 	}
 
-	blk_queue_segment_boundary(sdev->request_queue, segment_boundary);
-	blk_queue_max_hw_segments(sdev->request_queue, sg_tablesize);
 	ata_port_printk(ap, KERN_INFO,
 		"DMA mask 0x%llX, segment boundary 0x%lX, hw segs %hu\n",
 		(unsigned long long)*ap->host->dev->dma_mask,
 		segment_boundary, sg_tablesize);
 
-	spin_unlock_irqrestore(ap->lock, flags);
 
 	return rc;
 }
-- 
1.5.4.5

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