linux-kernel - [PATCH 2/2] SVCRDMA: Fix erroneous BUG_ON in send

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Message-Id: <1205260300-19127-3-git-send-email-bfields@citi.umich.edu>
Date:	Tue, 11 Mar 2008 14:31:40 -0400
From:	"J. Bruce Fields" <bfields@...i.umich.edu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	Tom Tucker <tom@...ngridcomputing.com>,
	"J. Bruce Fields" <bfields@...i.umich.edu>
Subject: [PATCH 2/2] SVCRDMA: Fix erroneous BUG_ON in send_write

From: Tom Tucker <tom@...ngridcomputing.com>

The assertion that checks for sge context overflow is
incorrectly hard-coded to 32. This causes a kernel bug
check when using big-data mounts. Changed the BUG_ON to
use the computed value RPCSVC_MAXPAGES.

Signed-off-by: Tom Tucker <tom@...ngridcomputing.com>
Signed-off-by: J. Bruce Fields <bfields@...i.umich.edu>
---
 net/sunrpc/xprtrdma/svc_rdma_sendto.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
index 0598b22..981f190 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -156,7 +156,7 @@ static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp,
 	struct svc_rdma_op_ctxt *ctxt;
 	int ret = 0;
 
-	BUG_ON(sge_count >= 32);
+	BUG_ON(sge_count > RPCSVC_MAXPAGES);
 	dprintk("svcrdma: RDMA_WRITE rmr=%x, to=%llx, xdr_off=%d, "
 		"write_len=%d, xdr_sge=%p, sge_count=%d\n",
 		rmr, (unsigned long long)to, xdr_off,
-- 
1.5.4.rc2.60.gb2e62

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