From patchwork Thu Oct 19 10:29:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mathias Nyman X-Patchwork-Id: 13428589 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (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 09F0818C0E for ; Thu, 19 Oct 2023 10:28:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="mDvKCMu/" Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F395611F for ; Thu, 19 Oct 2023 03:28:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1697711286; x=1729247286; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=BBNeESsLy6O1gxqjsd4WRAh7535MotGXUwEeJ7PfTp8=; b=mDvKCMu/kuKiixqa/0Bxfp1w8zYabN4rkKT+oRWn2ZZ72Xi4+gJYCMVX 5hsUywh0XmxgFtR9wjcLrKatJLkSXDQGy6iLQUMODQH09EehqTa50/8+z IhJhdiiU9QaUwvR/aTglQMi0pdbxxfx8HW9tekxccU6MoRZ320wJlvrOl /j9XEuO5QBAS5ha/DhF05KgqCfRQTcfN79ebgmWApGE4yXJL2+nWbn5p6 mZSNMjeY2btxcVDTAHQBgL51bC+qARkHMhKuHm4z2G4biufE60L5WLaQX X9G2+b0FeEpu4VqviFC3W5AmS4Lj7Ib8GkmOTTLkbRLTcMuO/CY/EZfRQ g==; X-IronPort-AV: E=McAfee;i="6600,9927,10867"; a="389075791" X-IronPort-AV: E=Sophos;i="6.03,237,1694761200"; d="scan'208";a="389075791" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Oct 2023 03:28:05 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10867"; a="930557523" X-IronPort-AV: E=Sophos;i="6.03,237,1694761200"; d="scan'208";a="930557523" Received: from mattu-haswell.fi.intel.com ([10.237.72.199]) by orsmga005.jf.intel.com with ESMTP; 19 Oct 2023 03:28:04 -0700 From: Mathias Nyman To: Cc: , Mathias Nyman Subject: [PATCH 03/19] xhci: expand next_trb() helper to support more ring types Date: Thu, 19 Oct 2023 13:29:08 +0300 Message-Id: <20231019102924.2797346-4-mathias.nyman@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231019102924.2797346-1-mathias.nyman@linux.intel.com> References: <20231019102924.2797346-1-mathias.nyman@linux.intel.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The next_trb() helper relies on a link TRB at the end of a ring segment to know a segment ends. This works well with transfer rings that use link trbs, but not with event rings. Event rings segments are always filled by host to segment size before moving to next segment. It does not use link TRBs Check for both link trb and full segment in next_trb() helper to support event rings. Useful if several interrupters with several event rings are supported. Signed-off-by: Mathias Nyman --- drivers/usb/host/xhci-ring.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 48daeb4b4a46..17e37c2a14aa 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -144,7 +144,7 @@ static void next_trb(struct xhci_hcd *xhci, struct xhci_segment **seg, union xhci_trb **trb) { - if (trb_is_link(*trb)) { + if (trb_is_link(*trb) || last_trb_on_seg(*seg, *trb)) { *seg = (*seg)->next; *trb = ((*seg)->trbs); } else {