linux-kernel - Re: [PATCH] net: via-velocity.c fix sleep-with-spinlock bug during MTU change

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Message-ID: <20080617214538.GA6388@electric-eye.fr.zoreil.com>
Date:	Tue, 17 Jun 2008 23:45:38 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	Séguier Régis <rseguier@...eleport.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>, alan@...hat.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: via-velocity.c fix sleep-with-spinlock bug during
	MTU change

Séguier Régis <rseguier@...eleport.net> :
[...]
> The mtu change doesn't work :
>
> Jun 16 23:22:34 apollo kernel: ------------[ cut here ]------------
> Jun 16 23:22:34 apollo kernel: WARNING: at arch/x86/kernel/pci-dma.c:482 
> dma_free_coherent+0x3a/0x9c()
> Jun 16 23:22:34 apollo kernel: Pid: 1527, comm: ip Tainted: G        W 
> 2.6.26-rc6EPIA_SN_VB7001 #3
> Jun 16 23:22:34 apollo kernel:  [<c0115fe5>] warn_on_slowpath+0x3b/0x5f
> Jun 16 23:22:34 apollo kernel:  [<c0133940>] 
> get_page_from_freelist+0x24a/0x36f
> Jun 16 23:22:34 apollo kernel:  [<c012d86b>] handle_IRQ_event+0x1a/0x3f
> Jun 16 23:22:34 apollo kernel:  [<c0241193>] velocity_free_rd_ring+0xa5/0xb6
> Jun 16 23:22:34 apollo kernel:  [<c0144752>] kfree+0x6a/0x72
> Jun 16 23:22:34 apollo kernel:  [<c0241193>] velocity_free_rd_ring+0xa5/0xb6
> Jun 16 23:22:34 apollo kernel:  [<c0105816>] dma_free_coherent+0x3a/0x9c
> Jun 16 23:22:34 apollo kernel:  [<c02411eb>] 
> velocity_free_dma_rings+0x47/0x4d
> Jun 16 23:22:34 apollo kernel:  [<c024225b>] velocity_change_mtu+0xf6/0x157
> Jun 16 23:22:34 apollo kernel:  [<c02856c4>] dev_set_mtu+0x2a/0x4f
> Jun 16 23:22:34 apollo kernel:  [<c0286642>] dev_ioctl+0x4ab/0x530
> Jun 16 23:22:34 apollo kernel:  [<c012e4cb>] handle_fasteoi_irq+0x74/0x77
> Jun 16 23:22:34 apollo kernel:  [<c010479b>] do_IRQ+0x50/0x60
> Jun 16 23:22:34 apollo kernel:  [<c027d785>] sock_ioctl+0x0/0x177

Does the patch below make a difference ?

diff --git a/drivers/net/via-velocity.c b/drivers/net/via-velocity.c
index 71a5133..fa303da 100644
--- a/drivers/net/via-velocity.c
+++ b/drivers/net/via-velocity.c
@@ -1274,7 +1274,7 @@ static void velocity_free_rd_ring(struct velocity_info *vptr)
 				 PCI_DMA_FROMDEVICE);
 		rd_info->skb_dma = (dma_addr_t) NULL;
 
-		dev_kfree_skb(rd_info->skb);
+		dev_kfree_skb_any(rd_info->skb);
 		rd_info->skb = NULL;
 	}
 
@@ -1336,7 +1336,7 @@ static void velocity_free_td_ring_entry(struct velocity_info *vptr,
 				td_info->skb_dma[i] = (dma_addr_t) NULL;
 			}
 		}
-		dev_kfree_skb(td_info->skb);
+		dev_kfree_skb_any(td_info->skb);
 		td_info->skb = NULL;
 	}
 }
-- 
Ueimor
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