6.13-stable review patch. If anyone has any objections, please let me know.
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From: Tomasz Pakuła tomasz.pakula.oficjalny@gmail.com
[ Upstream commit 1f650dcec32d22deb1d6db12300a2b98483099a9 ]
As noted by Anssi some 20 years ago, pool report is sometimes messed up. This worked fine on many devices but casued oops on VRS DirectForce PRO.
Here, we're making sure pool report is refetched before trying to access any of it's fields. While loop was replaced with a for loop + exit conditions were moved aroud to decrease the possibility of creating an infinite loop scenario.
Signed-off-by: Tomasz Pakuła tomasz.pakula.oficjalny@gmail.com Signed-off-by: Jiri Kosina jkosina@suse.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/hid/usbhid/hid-pidff.c | 29 +++++++++++++---------------- 1 file changed, 13 insertions(+), 16 deletions(-)
diff --git a/drivers/hid/usbhid/hid-pidff.c b/drivers/hid/usbhid/hid-pidff.c index f23381b6e3447..503f643b59cad 100644 --- a/drivers/hid/usbhid/hid-pidff.c +++ b/drivers/hid/usbhid/hid-pidff.c @@ -604,28 +604,25 @@ static void pidff_reset(struct pidff_device *pidff) }
/* - * Refetch pool report + * Fetch pool report */ static void pidff_fetch_pool(struct pidff_device *pidff) { - if (!pidff->pool[PID_SIMULTANEOUS_MAX].value) - return; + int i; + struct hid_device *hid = pidff->hid;
- int i = 0; - while (pidff->pool[PID_SIMULTANEOUS_MAX].value[0] < 2) { - hid_dbg(pidff->hid, "pid_pool requested again\n"); - hid_hw_request(pidff->hid, pidff->reports[PID_POOL], - HID_REQ_GET_REPORT); - hid_hw_wait(pidff->hid); + /* Repeat if PID_SIMULTANEOUS_MAX < 2 to make sure it's correct */ + for(i = 0; i < 20; i++) { + hid_hw_request(hid, pidff->reports[PID_POOL], HID_REQ_GET_REPORT); + hid_hw_wait(hid);
- /* break after 20 tries with SIMULTANEOUS_MAX < 2 */ - if (i++ > 20) { - hid_warn(pidff->hid, - "device reports %d simultaneous effects\n", - pidff->pool[PID_SIMULTANEOUS_MAX].value[0]); - break; - } + if (!pidff->pool[PID_SIMULTANEOUS_MAX].value) + return; + if (pidff->pool[PID_SIMULTANEOUS_MAX].value[0] >= 2) + return; } + hid_warn(hid, "device reports %d simultaneous effects\n", + pidff->pool[PID_SIMULTANEOUS_MAX].value[0]); }
/*