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media: rc: ttusbir: respect DMA coherency rules

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Buffers must not share a cache line with other data structures.
Allocate separately.

Fixes: 0938069fa0 ("[media] rc: Add support for the TechnoTrend USB IR Receiver")
Cc: stable@vger.kernel.org
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
This commit is contained in:
Oliver Neukum
2026-02-11 19:11:04 +01:00
committed by Hans Verkuil
parent eac69475b0
commit 50acaad3d2
1 changed files with 9 additions and 4 deletions
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13
drivers/media/rc/ttusbir.c
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@@ -32,7 +32,7 @@ struct ttusbir {
struct led_classdev led;
struct urb *bulk_urb;
uint8_t bulk_buffer[5];
u8 *bulk_buffer;
int bulk_out_endp, iso_in_endp;
bool led_on, is_led_on;
atomic_t led_complete;
@@ -186,13 +186,16 @@ static int ttusbir_probe(struct usb_interface *intf,
struct rc_dev *rc;
int i, j, ret;
int altsetting = -1;
u8 *buffer;
tt = kzalloc_obj(*tt);
buffer = kzalloc(5, GFP_KERNEL);
rc = rc_allocate_device(RC_DRIVER_IR_RAW);
if (!tt || !rc) {
if (!tt || !rc || buffer) {
ret = -ENOMEM;
goto out;
}
tt->bulk_buffer = buffer;
/* find the correct alt setting */
for (i = 0; i < intf->num_altsetting && altsetting == -1; i++) {
@@ -281,8 +284,8 @@ static int ttusbir_probe(struct usb_interface *intf,
tt->bulk_buffer[3] = 0x01;
usb_fill_bulk_urb(tt->bulk_urb, tt->udev, usb_sndbulkpipe(tt->udev,
tt->bulk_out_endp), tt->bulk_buffer, sizeof(tt->bulk_buffer),
ttusbir_bulk_complete, tt);
tt->bulk_out_endp), tt->bulk_buffer, 5,
ttusbir_bulk_complete, tt);
tt->led.name = "ttusbir:green:power";
tt->led.default_trigger = "rc-feedback";
@@ -350,6 +353,7 @@ static int ttusbir_probe(struct usb_interface *intf,
kfree(tt);
}
rc_free_device(rc);
kfree(buffer);
return ret;
}
@@ -373,6 +377,7 @@ static void ttusbir_disconnect(struct usb_interface *intf)
usb_kill_urb(tt->bulk_urb);
usb_free_urb(tt->bulk_urb);
rc_free_device(tt->rc);
kfree(tt->bulk_buffer);
usb_set_intfdata(intf, NULL);
kfree(tt);
}