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Fix kernel crash during fail to initialize device in ibcore.

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This patch fixes the kernel crash that occurs during ib_dealloc_device()
called due to provider driver fails with an error after
ib_alloc_device() and before it can register using ib_register_device().

This crashed seen in tha lab as below which can occur with any IB device
which fails to perform its device initialization before invoking
ib_register_device().

This patch avoids touching cache and port immutable structures if device
is not yet initialized.
It also releases related memory when cache and port immutable data
structure initialization fails during register_device() state.

Linux commit:
4be3a4fa51f432ef045546d16f25c68a1ab525b9

MFC after:		1 week
Sponsored by:		Mellanox Technologies
This commit is contained in:
Hans Petter Selasky 2018-07-17 09:26:09 +00:00
parent 855ad7cf39
commit df9bb49b66
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=336381
1 changed files with 21 additions and 7 deletions
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28
sys/ofed/drivers/infiniband/core/ib_device.c
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@ -174,8 +174,16 @@ static void ib_device_release(struct device *device)
{
struct ib_device *dev = container_of(device, struct ib_device, dev);
ib_cache_release_one(dev);
kfree(dev->port_immutable);
WARN_ON(dev->reg_state == IB_DEV_REGISTERED);
if (dev->reg_state == IB_DEV_UNREGISTERED) {
/*
* In IB_DEV_UNINITIALIZED state, cache or port table
* is not even created. Free cache and port table only when
* device reaches UNREGISTERED state.
*/
ib_cache_release_one(dev);
kfree(dev->port_immutable);
}
kfree(dev);
}
@ -347,23 +355,21 @@ int ib_register_device(struct ib_device *device,
ret = ib_cache_setup_one(device);
if (ret) {
pr_warn("Couldn't set up InfiniBand P_Key/GID cache\n");
goto out;
goto port_cleanup;
}
memset(&device->attrs, 0, sizeof(device->attrs));
ret = device->query_device(device, &device->attrs, &uhw);
if (ret) {
pr_warn("Couldn't query the device attributes\n");
ib_cache_cleanup_one(device);
goto out;
goto cache_cleanup;
}
ret = ib_device_register_sysfs(device, port_callback);
if (ret) {
pr_warn("Couldn't register device %s with driver model\n",
device->name);
ib_cache_cleanup_one(device);
goto out;
goto cache_cleanup;
}
device->reg_state = IB_DEV_REGISTERED;
@ -375,6 +381,14 @@ int ib_register_device(struct ib_device *device,
down_write(&lists_rwsem);
list_add_tail(&device->core_list, &device_list);
up_write(&lists_rwsem);
mutex_unlock(&device_mutex);
return 0;
cache_cleanup:
ib_cache_cleanup_one(device);
ib_cache_release_one(device);
port_cleanup:
kfree(device->port_immutable);
out:
mutex_unlock(&device_mutex);
return ret;