From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 86AF59463 for ; Fri, 1 May 2026 17:27:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777656476; cv=none; b=scmvaY35nIul0Q+DD3xG8gJ3/pHa/Q2PbAzgFnGgu6CItbkAY/DauHEfvdYA4urCKV2xkUIW9aS6qJVBOZL1DwU/prKWuPs29ylKaJF7f/qMKv+Rt1g6ltCSwwW0AjBpJSZxetN2OS8rEdR7c/xNas8IxBIS8oH0EQb+iK4IBmc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777656476; c=relaxed/simple; bh=F/FXcK42sgd4jGAP3reCw4XU7PCq7ZCMk9xg/7kNISE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=n70diH6clI/AH9TqfB4ZOODb3B5RzLNiHDHup7DDZIZJoq7lB7WeaZGZijbbW/LZiN6IUhLjKTc6Q9rGThzisyM6nfvFidDOe4ZWsVQONcg2POkTVea8kKW47D+D0wKWXKjZ4s8/mh8orSBttPc3k8zAUEHSSap9yFIc3NAT194= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jukfgCHh; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="jukfgCHh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 84166C2BCB4; Fri, 1 May 2026 17:27:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777656476; bh=F/FXcK42sgd4jGAP3reCw4XU7PCq7ZCMk9xg/7kNISE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jukfgCHh+RCTJUa5NBbx0Hc7sheLUSy9vPQZ6+/LbJMKRK1LvXocbFKUzV0VeG/Fe oAXgZdu9YxNROCXxwNisFkNrRYSKXJSpEjDVlBY979CEUMpJEr51mOHg31YulNRtJl uaJCXB8dA/8T44H/xF4F7JKw76oT3NMqlcPAQhsr8VtV2DIqjPsi1wL3RyV6sqVycL 90T3+pX0Ir3uYePsmyBxQWuK6n2uuS2j7FWcMiZQDyEqvq+/RCSJvVL6ijDm6//JvM xgVUbCW9Lehn6U+bgAvbnmbnQXj0hGODKtRW3tthcPr7WszlRbvpAxAXuLvSYZrqOr FJSla0I9f4e4g== From: Sasha Levin To: stable@vger.kernel.org Cc: Oliver Neukum , Sean Young , Hans Verkuil , Sasha Levin Subject: [PATCH 5.15.y] media: rc: ttusbir: respect DMA coherency rules Date: Fri, 1 May 2026 13:27:52 -0400 Message-ID: <20260501172752.3765703-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026050122-strode-undress-d652@gregkh> References: <2026050122-strode-undress-d652@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Oliver Neukum [ Upstream commit 50acaad3d202c064779db8dc3d010007347f59c7 ] Buffers must not share a cache line with other data structures. Allocate separately. Fixes: 0938069fa0897 ("[media] rc: Add support for the TechnoTrend USB IR Receiver") Cc: stable@vger.kernel.org Signed-off-by: Oliver Neukum Signed-off-by: Sean Young Signed-off-by: Hans Verkuil [ kept kzalloc(sizeof(*tt), GFP_KERNEL) instead of kzalloc_obj() ] Signed-off-by: Sasha Levin --- drivers/media/rc/ttusbir.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/media/rc/ttusbir.c b/drivers/media/rc/ttusbir.c index 629787d53ee1c..91907c0262bdb 100644 --- a/drivers/media/rc/ttusbir.c +++ b/drivers/media/rc/ttusbir.c @@ -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; @@ -188,13 +188,16 @@ static int ttusbir_probe(struct usb_interface *intf, struct rc_dev *rc; int i, j, ret; int altsetting = -1; + u8 *buffer; tt = kzalloc(sizeof(*tt), GFP_KERNEL); + 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++) { @@ -283,8 +286,8 @@ 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"; @@ -353,6 +356,7 @@ static int ttusbir_probe(struct usb_interface *intf, kfree(tt); } rc_free_device(rc); + kfree(buffer); return ret; } @@ -375,6 +379,7 @@ static void ttusbir_disconnect(struct usb_interface *intf) } usb_kill_urb(tt->bulk_urb); usb_free_urb(tt->bulk_urb); + kfree(tt->bulk_buffer); usb_set_intfdata(intf, NULL); kfree(tt); } -- 2.53.0