diff options
| author | Bharat Bhushan <Bharat.Bhushan@nxp.com> | 2016-06-22 21:40:48 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-06-27 00:14:03 (GMT) |
| commit | f93627146f0e371093966ed3d44c065aa077cfb1 (patch) | |
| tree | e75a20bcceee608ac69f9319d15fb81637224c3a /drivers | |
| parent | fde867d308f39dfd4744c8da1695547b20e002b1 (diff) | |
| download | linux-f93627146f0e371093966ed3d44c065aa077cfb1.tar.xz | |
staging: fsl-mc: fix asymmetry in destroy of mc_io
An mc_io represents a mapped MC portal. Previously, an mc_io was
created for the root dprc in fsl_mc_bus_probe() and for child dprcs
in dprc_probe(). But the free of that data structure happened in the
general bus remove callback. This asymmetry resulted in some bugs due
to unwanted destroys of mc_io object in some scenarios (e.g. vfio).
Fix this bug by making things symmetric-- mc_io created in
fsl_mc_bus_probe() is freed in fsl_mc_bus_remove(). The mc_io created
in dprc_probe() is freed in dprc_remove().
Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
[Stuart: added check for root dprc and reworded commit message]
Signed-off-by: Stuart Yoder <stuart.yoder@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/fsl-mc/bus/dprc-driver.c | 5 | ||||
| -rw-r--r-- | drivers/staging/fsl-mc/bus/mc-bus.c | 8 |
2 files changed, 9 insertions, 4 deletions
diff --git a/drivers/staging/fsl-mc/bus/dprc-driver.c b/drivers/staging/fsl-mc/bus/dprc-driver.c index f865d18..1a6bcc4 100644 --- a/drivers/staging/fsl-mc/bus/dprc-driver.c +++ b/drivers/staging/fsl-mc/bus/dprc-driver.c @@ -801,6 +801,11 @@ static int dprc_remove(struct fsl_mc_device *mc_dev) dev_set_msi_domain(&mc_dev->dev, NULL); } + if (!fsl_mc_is_root_dprc(&mc_dev->dev)) { + fsl_destroy_mc_io(mc_dev->mc_io); + mc_dev->mc_io = NULL; + } + dev_info(&mc_dev->dev, "DPRC device unbound from driver"); return 0; } diff --git a/drivers/staging/fsl-mc/bus/mc-bus.c b/drivers/staging/fsl-mc/bus/mc-bus.c index a49186e..db3afdb 100644 --- a/drivers/staging/fsl-mc/bus/mc-bus.c +++ b/drivers/staging/fsl-mc/bus/mc-bus.c @@ -579,10 +579,6 @@ void fsl_mc_device_remove(struct fsl_mc_device *mc_dev) if (strcmp(mc_dev->obj_desc.type, "dprc") == 0) { mc_bus = to_fsl_mc_bus(mc_dev); - if (mc_dev->mc_io) { - fsl_destroy_mc_io(mc_dev->mc_io); - mc_dev->mc_io = NULL; - } if (fsl_mc_is_root_dprc(&mc_dev->dev)) { if (atomic_read(&root_dprc_count) > 0) @@ -810,6 +806,10 @@ static int fsl_mc_bus_remove(struct platform_device *pdev) return -EINVAL; fsl_mc_device_remove(mc->root_mc_bus_dev); + + fsl_destroy_mc_io(mc->root_mc_bus_dev->mc_io); + mc->root_mc_bus_dev->mc_io = NULL; + dev_info(&pdev->dev, "Root MC bus device removed"); return 0; } |