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Fri, 07 Aug 2026 00:54:51 -0700 (PDT) Received: from QCOM-WFsSr66Fqw.qualcomm.com ([212.136.9.4]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c2080cfddbbsm20020666b.61.2026.08.07.00.54.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 07 Aug 2026 00:54:49 -0700 (PDT) From: Igor Skalkin To: Greg Kroah-Hartman Cc: Alan Stern , Felipe Balbi , Tatyana Brokhman , Kees Cook , Sebastian Andrzej Siewior , Sebastian Urban , Seungjin Bae , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Trilok Soni , Igor Skalkin Subject: [PATCH 4/4] usb: gadget: dummy_hcd: set no_sg_constraint on the host controller Date: Fri, 7 Aug 2026 09:54:38 +0200 Message-ID: <20260807075438.5566-5-igor.skalkin@oss.qualcomm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260807075438.5566-1-igor.skalkin@oss.qualcomm.com> References: <20260807075438.5566-1-igor.skalkin@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: XOzNsn7qhdzDz0VIzjevMRIuwaAhMoM8 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODA3MDA1NyBTYWx0ZWRfX9zSkbO0Zywr/ iSwCrZXWToh0LA9Awee5CHK968mf4kMfHnKEUvy7Q/VF5e51Qh4rdDLppSKpabhZFYzIsb+dQl8 zeyp613DcO31bXqwHKc1n7nyvEF9/OKz+Xgi4HX5vFsgye2MWJ3Fo6P4/dt3ASB0DNwr5HBQnTy dHCh8P7PPPhKGDNgLDnck6pT49dL0AowFEUywZ3oHyciw4UWlWKE4V9jTNKyIfEF3oTfdCIt07O 8tPNdPAU+dxMYghAC7qDm8dvGHy95RCdt6TrvTEfNc0+daEF74HMAthsb5ibrXaA8yLnynWDoBB w6wq2wW5SYqB3ilQ5mpD0wNKncz3aJeHk2ndmvXlOyBrkoHpl4OSo4v92DrdD8pG4peJWB+6Vp2 4D32X6c2Je12nsdu/5T3ll0FSTCsI+8UvLRY+aL1Lw+KyzvVibhMIXEWsFiaNSyF2OP0S4OyP+a dkBh8/N1EMbkPqkDxGg== X-Proofpoint-Spam-Info: AW1haW4tMjYwODA3MDA1NyBTYWx0ZWRfX/evwkWwLswoU 0PS6UfyxY2tQPF/SHDfO2ArMABaqAXhLZ5Zi0he/CkqchsdhAga+16YK9XmH9iUdpBm7FgGMSAM R1obS+pzX5utsZEWrTcqEytap02VyZw= X-Proofpoint-ORIG-GUID: XOzNsn7qhdzDz0VIzjevMRIuwaAhMoM8 X-Authority-Analysis: v=2.4 cv=MbpcfZ/f c=1 sm=1 tr=0 ts=6a758f4c cx=c_pps a=50t2pK5VMbmlHzFWWp8p/g==:117 a=dNlqnMcrdpbb+gQrTujlOQ==:17 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=EUspDBNiAAAA:8 a=WZ_pTnkcMvjAhArtRZoA:9 a=IoWCM6iH3mJn3m4BftBB:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-07_01,2026-08-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 adultscore=0 priorityscore=1501 clxscore=1015 malwarescore=0 bulkscore=0 lowpriorityscore=0 suspectscore=0 spamscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608070057 dummy_hcd copies data in software and has no hardware DMA alignment requirement. Set no_sg_constraint = 1 so the USB core does not reject SG URBs whose non-final segments are not a multiple of the endpoint maxpacket size. For SuperSpeed bulk endpoints maxpacket is 1024 bytes; usbtest generates SG lists with varying segment sizes (e.g. 512 bytes) that are valid transfers but not maxpacket-aligned, causing usb_submit_urb to return -EINVAL before the URB reaches the host controller. Assisted-by: OpenCode:claude-sonnet-5 Signed-off-by: Igor Skalkin --- drivers/usb/gadget/udc/dummy_hcd.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c index 7597c9e9fa66..2cfb1d035b34 100644 --- a/drivers/usb/gadget/udc/dummy_hcd.c +++ b/drivers/usb/gadget/udc/dummy_hcd.c @@ -2550,6 +2550,7 @@ static int dummy_setup(struct usb_hcd *hcd) dum = *((void **)dev_get_platdata(hcd->self.controller)); hcd->self.sg_tablesize = ~0; + hcd->self.no_sg_constraint = 1; if (usb_hcd_is_primary_hcd(hcd)) { dum->hs_hcd = hcd_to_dummy_hcd(hcd); dum->hs_hcd->dum = dum; -- 2.49.0