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authorJason Gunthorpe <jgg@nvidia.com>2021-06-17 16:22:09 +0200
committerAlex Williamson <alex.williamson@redhat.com>2021-06-21 15:29:24 -0600
commit204db60c83574559a8e08ce4bbd0029d56b8ab2e (patch)
tree3741c49db2424f57bb217eee62405067b361a9b7
parent009c9aa5be652675a06d5211e1640e02bbb1c33d (diff)
downloadlinux-204db60c83574559a8e08ce4bbd0029d56b8ab2e.tar.bz2
driver core: Pull required checks into driver_probe_device()
Checking if the dev is dead or if the dev is already bound is a required precondition to invoking driver_probe_device(). All the call chains leading here duplicate these checks. Add it directly to driver_probe_device() so the precondition is clear and remove the checks from device_driver_attach() and __driver_attach_async_helper(). The other call chain going through __device_attach_driver() does have these same checks but they are inlined into logic higher up the call stack and can't be removed. The sysfs uAPI call chain starting at bind_store() is a bit confused because it reads dev->driver unlocked and returns -ENODEV if it is !NULL, otherwise it reads it again under lock and returns 0 if it is !NULL. Fix this to always return -EBUSY and always read dev->driver under its lock. Done in preparation for the next patches which will add additional callers to driver_probe_device() and will need these checks as well. Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> [hch: drop the extra checks in device_driver_attach and bind_store] Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Link: https://lore.kernel.org/r/20210617142218.1877096-2-hch@lst.de Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
-rw-r--r--drivers/base/bus.c2
-rw-r--r--drivers/base/dd.c32
2 files changed, 11 insertions, 23 deletions
diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 36d0c654ea61..7de13302e8c8 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -210,7 +210,7 @@ static ssize_t bind_store(struct device_driver *drv, const char *buf,
int err = -ENODEV;
dev = bus_find_device_by_name(bus, NULL, buf);
- if (dev && dev->driver == NULL && driver_match_device(drv, dev)) {
+ if (dev && driver_match_device(drv, dev)) {
err = device_driver_attach(drv, dev);
if (err > 0) {
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index ecd7cf848daf..7477d3322b3a 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -733,8 +733,9 @@ EXPORT_SYMBOL_GPL(wait_for_device_probe);
* @drv: driver to bind a device to
* @dev: device to try to bind to the driver
*
- * This function returns -ENODEV if the device is not registered,
- * 1 if the device is bound successfully and 0 otherwise.
+ * This function returns -ENODEV if the device is not registered, -EBUSY if it
+ * already has a driver, and 1 if the device is bound successfully and 0
+ * otherwise.
*
* This function must be called with @dev lock held. When called for a
* USB interface, @dev->parent lock must be held as well.
@@ -745,8 +746,10 @@ static int driver_probe_device(struct device_driver *drv, struct device *dev)
{
int ret = 0;
- if (!device_is_registered(dev))
+ if (dev->p->dead || !device_is_registered(dev))
return -ENODEV;
+ if (dev->driver)
+ return -EBUSY;
dev->can_match = true;
pr_debug("bus: '%s': %s: matched device %s with driver %s\n",
@@ -1027,17 +1030,10 @@ static void __device_driver_unlock(struct device *dev, struct device *parent)
*/
int device_driver_attach(struct device_driver *drv, struct device *dev)
{
- int ret = 0;
+ int ret;
__device_driver_lock(dev, dev->parent);
-
- /*
- * If device has been removed or someone has already successfully
- * bound a driver before us just skip the driver probe call.
- */
- if (!dev->p->dead && !dev->driver)
- ret = driver_probe_device(drv, dev);
-
+ ret = driver_probe_device(drv, dev);
__device_driver_unlock(dev, dev->parent);
return ret;
@@ -1047,19 +1043,11 @@ static void __driver_attach_async_helper(void *_dev, async_cookie_t cookie)
{
struct device *dev = _dev;
struct device_driver *drv;
- int ret = 0;
+ int ret;
__device_driver_lock(dev, dev->parent);
-
drv = dev->p->async_driver;
-
- /*
- * If device has been removed or someone has already successfully
- * bound a driver before us just skip the driver probe call.
- */
- if (!dev->p->dead && !dev->driver)
- ret = driver_probe_device(drv, dev);
-
+ ret = driver_probe_device(drv, dev);
__device_driver_unlock(dev, dev->parent);
dev_dbg(dev, "driver %s async attach completed: %d\n", drv->name, ret);