From d23670069ad60c82234e51a945e8b472e8c7bde2 Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Tue, 10 Aug 2010 18:01:14 -0700 Subject: [PATCH] drivers/message: move dereference after NULL test If the NULL test on dev->i2o_dev or i2o_dev is needed, then the dereference should be after the NULL test. A simplified version of the semantic match that detects this problem is as follows (http://coccinelle.lip6.fr/): // @match exists@ expression x, E; identifier fld; @@ * x->fld ... when != \(x = E\|&x\) * x == NULL // Signed-off-by: Julia Lawall Cc: James Bottomley Cc: Kashyap Desai Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/message/i2o/i2o_block.c | 3 ++- drivers/message/i2o/i2o_scsi.c | 3 +-- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c index e6733bc99724..f0f1e667000f 100644 --- a/drivers/message/i2o/i2o_block.c +++ b/drivers/message/i2o/i2o_block.c @@ -727,7 +727,7 @@ static int i2o_block_transfer(struct request *req) { struct i2o_block_device *dev = req->rq_disk->private_data; struct i2o_controller *c; - u32 tid = dev->i2o_dev->lct_data.tid; + u32 tid; struct i2o_message *msg; u32 *mptr; struct i2o_block_request *ireq = req->special; @@ -743,6 +743,7 @@ static int i2o_block_transfer(struct request *req) goto exit; } + tid = dev->i2o_dev->lct_data.tid; c = dev->i2o_dev->iop; msg = i2o_msg_get(c); diff --git a/drivers/message/i2o/i2o_scsi.c b/drivers/message/i2o/i2o_scsi.c index 3d45817e6dcd..ea6b2197da8a 100644 --- a/drivers/message/i2o/i2o_scsi.c +++ b/drivers/message/i2o/i2o_scsi.c @@ -528,7 +528,6 @@ static int i2o_scsi_queuecommand(struct scsi_cmnd *SCpnt, * Do the incoming paperwork */ i2o_dev = SCpnt->device->hostdata; - c = i2o_dev->iop; SCpnt->scsi_done = done; @@ -538,7 +537,7 @@ static int i2o_scsi_queuecommand(struct scsi_cmnd *SCpnt, done(SCpnt); goto exit; } - + c = i2o_dev->iop; tid = i2o_dev->lct_data.tid; osm_debug("qcmd: Tid = %03x\n", tid); -- 2.39.5