The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

Possible dependencies:

65946690ed8d ("firmware: coreboot: Register bus in module init") cae0970ee9c4 ("firmware: google: Release devices before unregistering the bus")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 65946690ed8d972fdb91a74ee75ac0f0f0d68321 Mon Sep 17 00:00:00 2001 From: Brian Norris briannorris@chromium.org Date: Wed, 19 Oct 2022 18:10:53 -0700 Subject: [PATCH] firmware: coreboot: Register bus in module init

The coreboot_table driver registers a coreboot bus while probing a "coreboot_table" device representing the coreboot table memory region. Probing this device (i.e., registering the bus) is a dependency for the module_init() functions of any driver for this bus (e.g., memconsole-coreboot.c / memconsole_driver_init()).

With synchronous probe, this dependency works OK, as the link order in the Makefile ensures coreboot_table_driver_init() (and thus, coreboot_table_probe()) completes before a coreboot device driver tries to add itself to the bus.

With asynchronous probe, however, coreboot_table_probe() may race with memconsole_driver_init(), and so we're liable to hit one of these two:

1. coreboot_driver_register() eventually hits "[...] the bus was not initialized.", and the memconsole driver fails to register; or 2. coreboot_driver_register() gets past #1, but still races with bus_register() and hits some other undefined/crashing behavior (e.g., in driver_find() [1])

We can resolve this by registering the bus in our initcall, and only deferring "device" work (scanning the coreboot memory region and creating sub-devices) to probe().

[1] Example failure, using 'driver_async_probe=*' kernel command line:

[ 0.114217] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010 ... [ 0.114307] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.1.0-rc1 #63 [ 0.114316] Hardware name: Google Scarlet (DT) ... [ 0.114488] Call trace: [ 0.114494] _raw_spin_lock+0x34/0x60 [ 0.114502] kset_find_obj+0x28/0x84 [ 0.114511] driver_find+0x30/0x50 [ 0.114520] driver_register+0x64/0x10c [ 0.114528] coreboot_driver_register+0x30/0x3c [ 0.114540] memconsole_driver_init+0x24/0x30 [ 0.114550] do_one_initcall+0x154/0x2e0 [ 0.114560] do_initcall_level+0x134/0x160 [ 0.114571] do_initcalls+0x60/0xa0 [ 0.114579] do_basic_setup+0x28/0x34 [ 0.114588] kernel_init_freeable+0xf8/0x150 [ 0.114596] kernel_init+0x2c/0x12c [ 0.114607] ret_from_fork+0x10/0x20 [ 0.114624] Code: 5280002b 1100054a b900092a f9800011 (885ffc01) [ 0.114631] ---[ end trace 0000000000000000 ]---

Fixes: b81e3140e412 ("firmware: coreboot: Make bus registration symmetric") Cc: stable@vger.kernel.org Signed-off-by: Brian Norris briannorris@chromium.org Reviewed-by: Guenter Roeck linux@roeck-us.net Reviewed-by: Stephen Boyd swboyd@chromium.org Link: https://lore.kernel.org/r/20221019180934.1.If29e167d8a4771b0bf4a39c89c6946ed... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

diff --git a/drivers/firmware/google/coreboot_table.c b/drivers/firmware/google/coreboot_table.c index c52bcaa9def6..9ca21feb9d45 100644 --- a/drivers/firmware/google/coreboot_table.c +++ b/drivers/firmware/google/coreboot_table.c @@ -149,12 +149,8 @@ static int coreboot_table_probe(struct platform_device *pdev) if (!ptr) return -ENOMEM;

- ret = bus_register(&coreboot_bus_type); - if (!ret) { - ret = coreboot_table_populate(dev, ptr); - if (ret) - bus_unregister(&coreboot_bus_type); - } + ret = coreboot_table_populate(dev, ptr); + memunmap(ptr);

return ret; @@ -169,7 +165,6 @@ static int __cb_dev_unregister(struct device *dev, void *dummy) static int coreboot_table_remove(struct platform_device *pdev) { bus_for_each_dev(&coreboot_bus_type, NULL, NULL, __cb_dev_unregister); - bus_unregister(&coreboot_bus_type); return 0; }

@@ -199,6 +194,32 @@ static struct platform_driver coreboot_table_driver = { .of_match_table = of_match_ptr(coreboot_of_match), }, }; -module_platform_driver(coreboot_table_driver); + +static int __init coreboot_table_driver_init(void) +{ + int ret; + + ret = bus_register(&coreboot_bus_type); + if (ret) + return ret; + + ret = platform_driver_register(&coreboot_table_driver); + if (ret) { + bus_unregister(&coreboot_bus_type); + return ret; + } + + return 0; +} + +static void __exit coreboot_table_driver_exit(void) +{ + platform_driver_unregister(&coreboot_table_driver); + bus_unregister(&coreboot_bus_type); +} + +module_init(coreboot_table_driver_init); +module_exit(coreboot_table_driver_exit); + MODULE_AUTHOR("Google, Inc."); MODULE_LICENSE("GPL");