Make elantech_setup_ps2 and synaptics_init_ps2 set an appropriate fast_reconnect pointer when the PS/2 mode is used. When the SMBus connection is attempted psmouse_smbus_init sets the fast_reconnect pointer to psmouse_smbus_reconnect. When this fails elantech_setup_ps2 and synaptics_init_ps2 will fallback to PS/2 mode replacing the psmouse private data. This was causing an issue on resume since psmouse_smbus_reconnect was being called while in PS/2 mode and attempting to use the invalid private data. This issue was uncovered when psmouse_smbus_reconnect started attempting to use more of the data structure. Reported-by: Thorsten Leemhuis <linux@xxxxxxxxxxxxx> Closes: https://lore.kernel.org/all/ca0109fa-c64b-43c1-a651-75b294d750a1@xxxxxxxxxxxxx/ Fixes: 92e24e0e57f7 ("Input: psmouse - add delay when deactivating for SMBus mode") Tested-by: Thorsten Leemhuis <linux@xxxxxxxxxxxxx> Signed-off-by: Jeffery Miller <jefferymiller@xxxxxxxxxx> --- The other callbacks set in psmouse_smbus_init are already replaced. Changes in v2: - Also set fast_reconnect in the synaptics ps2 fallback path from review comments. - Add Fixes: tag to the commit that uncovered the problem. drivers/input/mouse/elantech.c | 1 + drivers/input/mouse/synaptics.c | 1 + 2 files changed, 2 insertions(+) diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c index 2118b2075f43..4e38229404b4 100644 --- a/drivers/input/mouse/elantech.c +++ b/drivers/input/mouse/elantech.c @@ -2114,6 +2114,7 @@ static int elantech_setup_ps2(struct psmouse *psmouse, psmouse->protocol_handler = elantech_process_byte; psmouse->disconnect = elantech_disconnect; psmouse->reconnect = elantech_reconnect; + psmouse->fast_reconnect = NULL; psmouse->pktsize = info->hw_version > 1 ? 6 : 4; return 0; diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c index ada299ec5bba..cefc74b3b34b 100644 --- a/drivers/input/mouse/synaptics.c +++ b/drivers/input/mouse/synaptics.c @@ -1623,6 +1623,7 @@ static int synaptics_init_ps2(struct psmouse *psmouse, psmouse->set_rate = synaptics_set_rate; psmouse->disconnect = synaptics_disconnect; psmouse->reconnect = synaptics_reconnect; + psmouse->fast_reconnect = NULL; psmouse->cleanup = synaptics_reset; /* Synaptics can usually stay in sync without extra help */ psmouse->resync_time = 0; -- 2.42.0.582.g8ccd20d70d-goog
