diff options
author | Xavier Drudis Ferran <xdrudis@tinet.cat> | 2023-06-21 09:13:07 +0200 |
---|---|---|
committer | Marek Vasut <marex@denx.de> | 2023-06-21 13:08:30 +0200 |
commit | 7a875a8e5c7af1d7c1c7232fbef898d0f18ec7da (patch) | |
tree | 89adb9de4b03cc85dfe2dedca9b5b10e7fc511cc | |
parent | 50842b217fef505a0ec6662cc2acdc55d0bb23c5 (diff) |
cmd: usb: Prevent reset in usb tree/info command
Commands causing reset in some configs:
When bootflow scan is run, this will cause a UCLASS_BOOTDEV device to
be added as sibling of those UCLASS_BLK devices found in the search
chain defined in environment variable "boot_targets", until boot
succeeds from some device. This can happen automatically as part of
the default boot process on some boards (example: Rock Pi 4) depending
on the board configuration (DISTRO_DEFAULTS, BOOTSTD, BOOTCOMMAND,
etc.) because they have bootcmd=bootflow scan.
If boot doesn't succeed from any device, and usb is in boot_targets,
and an usb storage device is plugged to some usb port at boot time,
its UCLASS_MASS_STORAGE device will have a UCLASS_BOOTDEV device as
child, besides a UCLASS_BLK child.
If once the boot fails the user enters at the U-Boot shell prompt:
usb info
or
usb tree
The code in cmd/usb.c will eventually recurse into the UCLASS_BOOTDEV
device and pass a null usb_device pointer to usb_show_tree_graph() or
usb_show_info() (because it has no parent_priv_).
This causes a reset. The expected behaviour would be to ignore the
UCLASS_BOOTDEV device, continue listing the usb information and return
to the prompt.
Minimal test:
Another way to trigger this reset as a minimal test or on boards with
a different bootcmd would be:
- make sure "usb" is in environment variable boot_targets (might need
setenv boot_targets usb; and/or saveenv and reset), then, with a usb
storage device plugged to a usb port, run:
=> usb reset ; bootflow scan ; usb info
Solution:
Fix it (twice) by checking for null parent_priv_ and adding
UCLASS_BOOTDEV to the list of ignored class ids before the recursive
call.
This prevents the current particular problem with UCLASS_BOOTDEV, even
in case it ever gets some parent_priv_ struct which is not an
usb_device, despite being the child of a usb_device->dev. And it also
prevents possible future problems if other children are added to usb
devices that don't have parent_priv_ because they are not part of the
usb tree, just abstractions of functionality (like UCLASS_BLK and
UCLASS_BOOTDEV are now).
Signed-off-by: Xavier Drudis Ferran <xdrudis@tinet.cat>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Marek Vasut <marex@denx.de>
Tested-by: Marek Vasut <marex@denx.de>
-rw-r--r-- | cmd/usb.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/cmd/usb.c b/cmd/usb.c index 619372838409..23253f22231c 100644 --- a/cmd/usb.c +++ b/cmd/usb.c @@ -421,7 +421,9 @@ static void usb_show_tree_graph(struct usb_device *dev, char *pre) * Ignore emulators and block child devices, we only want * real devices */ - if ((device_get_uclass_id(child) != UCLASS_USB_EMUL) && + if (udev && + (device_get_uclass_id(child) != UCLASS_BOOTDEV) && + (device_get_uclass_id(child) != UCLASS_USB_EMUL) && (device_get_uclass_id(child) != UCLASS_BLK)) { usb_show_tree_graph(udev, pre); pre[index] = 0; @@ -604,10 +606,12 @@ static void usb_show_info(struct usb_device *udev) child; device_find_next_child(&child)) { if (device_active(child) && + (device_get_uclass_id(child) != UCLASS_BOOTDEV) && (device_get_uclass_id(child) != UCLASS_USB_EMUL) && (device_get_uclass_id(child) != UCLASS_BLK)) { udev = dev_get_parent_priv(child); - usb_show_info(udev); + if (udev) + usb_show_info(udev); } } } |