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| author | Jorge Sanjuan Garcia <jorge.sanjuangarcia@duagon.com> | 2023-09-06 14:49:26 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-10-25 12:54:15 +0300 |
| commit | 008ba1a5ada58f0e4cdfaeff3eed88a443296ab0 (patch) | |
| tree | 83bd0397de516b4cc039284cc83a075816f1a910 /drivers | |
| parent | ec93456c0289850235cee83a91c6c5567d607a55 (diff) | |
| download | linux-008ba1a5ada58f0e4cdfaeff3eed88a443296ab0.tar.xz | |
mcb: remove is_added flag from mcb_device struct
commit 0f28ada1fbf0054557cddcdb93ad17f767105208 upstream.
When calling mcb_bus_add_devices(), both mcb devices and the mcb
bus will attempt to attach a device to a driver because they share
the same bus_type. This causes an issue when trying to cast the
container of the device to mcb_device struct using to_mcb_device(),
leading to a wrong cast when the mcb_bus is added. A crash occurs
when freing the ida resources as the bus numbering of mcb_bus gets
confused with the is_added flag on the mcb_device struct.
The only reason for this cast was to keep an is_added flag on the
mcb_device struct that does not seem necessary. The function
device_attach() handles already bound devices and the mcb subsystem
does nothing special with this is_added flag so remove it completely.
Fixes: 18d288198099 ("mcb: Correctly initialize the bus's device")
Cc: stable <stable@kernel.org>
Signed-off-by: Jorge Sanjuan Garcia <jorge.sanjuangarcia@duagon.com>
Co-developed-by: Jose Javier Rodriguez Barbarin <JoseJavier.Rodriguez@duagon.com>
Signed-off-by: Jose Javier Rodriguez Barbarin <JoseJavier.Rodriguez@duagon.com>
Link: https://lore.kernel.org/r/20230906114901.63174-2-JoseJavier.Rodriguez@duagon.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mcb/mcb-core.c | 10 | ||||
| -rw-r--r-- | drivers/mcb/mcb-parse.c | 2 |
2 files changed, 3 insertions, 9 deletions
diff --git a/drivers/mcb/mcb-core.c b/drivers/mcb/mcb-core.c index 8b8cd751fe9a..806a3d9da12f 100644 --- a/drivers/mcb/mcb-core.c +++ b/drivers/mcb/mcb-core.c @@ -389,17 +389,13 @@ EXPORT_SYMBOL_NS_GPL(mcb_free_dev, MCB); static int __mcb_bus_add_devices(struct device *dev, void *data) { - struct mcb_device *mdev = to_mcb_device(dev); int retval; - if (mdev->is_added) - return 0; - retval = device_attach(dev); - if (retval < 0) + if (retval < 0) { dev_err(dev, "Error adding device (%d)\n", retval); - - mdev->is_added = true; + return retval; + } return 0; } diff --git a/drivers/mcb/mcb-parse.c b/drivers/mcb/mcb-parse.c index aa6938da0db8..c41cbacc75a2 100644 --- a/drivers/mcb/mcb-parse.c +++ b/drivers/mcb/mcb-parse.c @@ -99,8 +99,6 @@ static int chameleon_parse_gdd(struct mcb_bus *bus, mdev->mem.end = mdev->mem.start + size - 1; mdev->mem.flags = IORESOURCE_MEM; - mdev->is_added = false; - ret = mcb_device_register(bus, mdev); if (ret < 0) goto err; |