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authorMartin Liu <liumartin@google.com>2018-05-30 19:31:36 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-05-31 11:12:07 +0300
commit8c97a46af04b4f7c0a0dded031fef1806872e648 (patch)
tree5405b6d743493ce9fc0ab0a411573531ab33eef3 /include/linux/device.h
parent0dda2bb6242361afd68332bf19bd67cd5981eb26 (diff)
downloadlinux-8c97a46af04b4f7c0a0dded031fef1806872e648.tar.xz
driver core: hold dev's parent lock when needed
SoC have internal I/O buses that can't be proved for devices. The devices on the buses can be accessed directly without additinal configuration required. This type of bus is represented as "simple-bus". In some platforms, we name "soc" with "simple-bus" attribute and many devices are hooked under it described in DT (device tree). In commit bf74ad5bc417 ("Hold the device's parent's lock during probe and remove") to solve USB subsystem lock sequence since USB device's characteristic. Thus "soc" needs to be locked whenever a device and driver's probing happen under "soc" bus. During this period, an async driver tries to probe a device which is under the "soc" bus would be blocked until previous driver finish the probing and release "soc" lock. And the next probing under the "soc" bus need to wait for async finish. Because of that, driver's async probe for init time improvement will be shadowed. Since many devices don't have USB devices' characteristic, they actually don't need parent's lock. Thus, we introduce a lock flag in bus_type struct and driver core would lock the parent lock base on the flag. For USB, we set this flag in usb_bus_type to keep original lock behavior in driver core. Async probe could have more benefit after this patch. Signed-off-by: Martin Liu <liumartin@google.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/device.h')
-rw-r--r--include/linux/device.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/device.h b/include/linux/device.h
index 477956990f5e..beca424395dd 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -98,6 +98,8 @@ extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
* @lock_key: Lock class key for use by the lock validator
* @force_dma: Assume devices on this bus should be set up by dma_configure()
* even if DMA capability is not explicitly described by firmware.
+ * @need_parent_lock: When probing or removing a device on this bus, the
+ * device core should lock the device's parent.
*
* A bus is a channel between the processor and one or more devices. For the
* purposes of the device model, all devices are connected via a bus, even if
@@ -138,6 +140,7 @@ struct bus_type {
struct lock_class_key lock_key;
bool force_dma;
+ bool need_parent_lock;
};
extern int __must_check bus_register(struct bus_type *bus);