From 6c06aec2487f7568cf57471a20f422568f25d551 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Fri, 16 May 2008 17:55:12 -0700 Subject: [PATCH] IB: fix race in device_create There is a race from when a device is created with device_create() and then the drvdata is set with a call to dev_set_drvdata() in which a sysfs file could be open, yet the drvdata will be NULL, causing all sorts of bad things to happen. This patch fixes the problem by using the new function, device_create_drvdata(). Cc: Kay Sievers Reviewed-by: Roland Dreier Cc: Sean Hefty Cc: Hal Rosenstock Signed-off-by: Greg Kroah-Hartman --- drivers/infiniband/core/user_mad.c | 14 ++++++-------- drivers/infiniband/core/uverbs_main.c | 11 ++++++----- 2 files changed, 12 insertions(+), 13 deletions(-) diff --git a/drivers/infiniband/core/user_mad.c b/drivers/infiniband/core/user_mad.c index 3aa2db54eae4..840ede9ae965 100644 --- a/drivers/infiniband/core/user_mad.c +++ b/drivers/infiniband/core/user_mad.c @@ -1005,8 +1005,9 @@ static int ib_umad_init_port(struct ib_device *device, int port_num, if (cdev_add(port->cdev, base_dev + port->dev_num, 1)) goto err_cdev; - port->dev = device_create(umad_class, device->dma_device, - port->cdev->dev, "umad%d", port->dev_num); + port->dev = device_create_drvdata(umad_class, device->dma_device, + port->cdev->dev, port, + "umad%d", port->dev_num); if (IS_ERR(port->dev)) goto err_cdev; @@ -1024,15 +1025,12 @@ static int ib_umad_init_port(struct ib_device *device, int port_num, if (cdev_add(port->sm_cdev, base_dev + port->dev_num + IB_UMAD_MAX_PORTS, 1)) goto err_sm_cdev; - port->sm_dev = device_create(umad_class, device->dma_device, - port->sm_cdev->dev, - "issm%d", port->dev_num); + port->sm_dev = device_create_drvdata(umad_class, device->dma_device, + port->sm_cdev->dev, port, + "issm%d", port->dev_num); if (IS_ERR(port->sm_dev)) goto err_sm_cdev; - dev_set_drvdata(port->dev, port); - dev_set_drvdata(port->sm_dev, port); - if (device_create_file(port->sm_dev, &dev_attr_ibdev)) goto err_sm_dev; if (device_create_file(port->sm_dev, &dev_attr_port)) diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c index cc1afa28c181..f806da184b51 100644 --- a/drivers/infiniband/core/uverbs_main.c +++ b/drivers/infiniband/core/uverbs_main.c @@ -755,14 +755,15 @@ static void ib_uverbs_add_one(struct ib_device *device) if (cdev_add(uverbs_dev->cdev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1)) goto err_cdev; - uverbs_dev->dev = device_create(uverbs_class, device->dma_device, - uverbs_dev->cdev->dev, - "uverbs%d", uverbs_dev->devnum); + uverbs_dev->dev = device_create_drvdata(uverbs_class, + device->dma_device, + uverbs_dev->cdev->dev, + uverbs_dev, + "uverbs%d", + uverbs_dev->devnum); if (IS_ERR(uverbs_dev->dev)) goto err_cdev; - dev_set_drvdata(uverbs_dev->dev, uverbs_dev); - if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev)) goto err_class; if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version)) -- 2.20.1