From: Bastien Nocera hadess@hadess.net

From: Bastien Nocera hadess@hadess.net

Contrary to the comment above the id table, we didn't implement a match function. This meant that every single Apple device that was already plugged in to the computer would have its device driver reprobed when the apple-mfi-fastcharge driver was loaded, eg. the SD card reader could be reprobed when the apple-mfi-fastcharge after pivoting root during boot up and the module became available.

Make sure that the driver probe isn't being run for unsupported devices by adding a match function that checks the product ID, in addition to the id_table checking the vendor ID.

Fixes: 249fa8217b84 ("USB: Add driver to control USB fast charge for iOS devices") Signed-off-by: Bastien Nocera hadess@hadess.net Reported-by: Pany pany@fedoraproject.org Link: https://bugzilla.redhat.com/show_bug.cgi?id=1878347 Link: https://lore.kernel.org/linux-usb/CAE3RAxt0WhBEz8zkHrVO5RiyEOasayy1QUAjsv-pB... Cc: stable@vger.kernel.org # 5.8 Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: Alan Stern stern@rowland.harvard.edu [m.v.b: Add Link and Reported-by tags to the commit message] Signed-off-by: M. Vefa Bicakci m.v.b@runbox.com --- drivers/usb/misc/apple-mfi-fastcharge.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/misc/apple-mfi-fastcharge.c b/drivers/usb/misc/apple-mfi-fastcharge.c index b403094a6b3a..579d8c84de42 100644 --- a/drivers/usb/misc/apple-mfi-fastcharge.c +++ b/drivers/usb/misc/apple-mfi-fastcharge.c @@ -163,17 +163,23 @@ static const struct power_supply_desc apple_mfi_fc_desc = { .property_is_writeable = apple_mfi_fc_property_is_writeable };

+static bool mfi_fc_match(struct usb_device *udev) +{ + int idProduct; + + idProduct = le16_to_cpu(udev->descriptor.idProduct); + /* See comment above mfi_fc_id_table[] */ + return (idProduct >= 0x1200 && idProduct <= 0x12ff); +} + static int mfi_fc_probe(struct usb_device *udev) { struct power_supply_config battery_cfg = {}; struct mfi_device *mfi = NULL; - int err, idProduct; + int err;

- idProduct = le16_to_cpu(udev->descriptor.idProduct); - /* See comment above mfi_fc_id_table[] */ - if (idProduct < 0x1200 || idProduct > 0x12ff) { + if (!mfi_fc_match(udev)) return -ENODEV; - }

mfi = kzalloc(sizeof(struct mfi_device), GFP_KERNEL); if (!mfi) { @@ -220,6 +226,7 @@ static struct usb_device_driver mfi_fc_driver = { .probe = mfi_fc_probe, .disconnect = mfi_fc_disconnect, .id_table = mfi_fc_id_table, + .match = mfi_fc_match, .generic_subclass = 1, };