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| author | Paul Durrant <pdurrant@amazon.com> | 2019-12-11 15:29:54 +0000 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2019-12-20 13:44:38 +0100 |
| commit | 672b7763cb2c723fd6f92a3879cc60d2fb11e56a (patch) | |
| tree | 0c02679348828cabd2b20ebfd564490ca20b8aa7 /drivers/xen | |
| parent | c534374ecf044384ddd24474b91fd0d31e720464 (diff) | |
| download | linux-672b7763cb2c723fd6f92a3879cc60d2fb11e56a.tar.gz linux-672b7763cb2c723fd6f92a3879cc60d2fb11e56a.tar.bz2 linux-672b7763cb2c723fd6f92a3879cc60d2fb11e56a.zip | |
xenbus: limit when state is forced to closed
If a driver probe() fails then leave the xenstore state alone. There is no
reason to modify it as the failure may be due to transient resource
allocation issues and hence a subsequent probe() may succeed.
If the driver supports re-binding then only force state to closed during
remove() only in the case when the toolstack may need to clean up. This can
be detected by checking whether the state in xenstore has been set to
closing prior to device removal.
NOTE: Re-bind support is indicated by new boolean in struct xenbus_driver,
which defaults to false. Subsequent patches will add support to
some backend drivers.
Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/xenbus/xenbus_probe.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c index 5aa29396c9e3..378486b79f96 100644 --- a/drivers/xen/xenbus/xenbus_probe.c +++ b/drivers/xen/xenbus/xenbus_probe.c @@ -255,7 +255,6 @@ fail_put: module_put(drv->driver.owner); fail: xenbus_dev_error(dev, err, "xenbus_dev_probe on %s", dev->nodename); - xenbus_switch_state(dev, XenbusStateClosed); return err; } EXPORT_SYMBOL_GPL(xenbus_dev_probe); @@ -276,7 +275,16 @@ int xenbus_dev_remove(struct device *_dev) free_otherend_details(dev); - xenbus_switch_state(dev, XenbusStateClosed); + /* + * If the toolstack has forced the device state to closing then set + * the state to closed now to allow it to be cleaned up. + * Similarly, if the driver does not support re-bind, set the + * closed. + */ + if (!drv->allow_rebind || + xenbus_read_driver_state(dev->nodename) == XenbusStateClosing) + xenbus_switch_state(dev, XenbusStateClosed); + return 0; } EXPORT_SYMBOL_GPL(xenbus_dev_remove); |