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From: Al Cooper <alcooperx@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: Al Cooper <alcooperx@gmail.com>,
	devicetree@vger.kernel.org, Felipe Balbi <balbi@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-usb@vger.kernel.org, Luis Chamberlain <mcgrof@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Rob Herring <robh+dt@kernel.org>
Subject: [PATCH 1/6] usb: bdc: driver runs out of buffer descriptors on large ADB transfers
Date: Thu, 20 Jun 2019 17:09:46 -0400
Message-ID: <1561064991-16874-2-git-send-email-alcooperx@gmail.com> (raw)
In-Reply-To: <1561064991-16874-1-git-send-email-alcooperx@gmail.com>

Version v1.0.40 of the Android host ADB software increased maximum
transfer sizes from 256K to 1M. Since the STB ADB gadget driver
requests only 16K at a time, the BDC driver ran out of buffer
descriptors (BDs) if the queuing happens faster than the incoming
16K transfers. This issue is fixed by doubling the number of BDs
that can be queued so that the entire 1M request can be queued
without running out of buffers.

Signed-off-by: Al Cooper <alcooperx@gmail.com>
---
 drivers/usb/gadget/udc/bdc/bdc.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/bdc/bdc.h b/drivers/usb/gadget/udc/bdc/bdc.h
index 6e1e881dc51e..ac75e25c3b6a 100644
--- a/drivers/usb/gadget/udc/bdc/bdc.h
+++ b/drivers/usb/gadget/udc/bdc/bdc.h
@@ -44,7 +44,7 @@
 #define NUM_SR_ENTRIES	64
 
 /* Num of bds per table */
-#define NUM_BDS_PER_TABLE	32
+#define NUM_BDS_PER_TABLE	64
 
 /* Num of tables in bd list for control,bulk and Int ep */
 #define NUM_TABLES	2
-- 
1.9.0.138.g2de3478


  reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-20 21:09 [PATCH 0/6] usb: bdc: Updates and fixes to USB BDC driver Al Cooper
2019-06-20 21:09 ` Al Cooper [this message]
2019-06-20 21:09 ` [PATCH 2/6] usb: bdc: Cleanup clock support Al Cooper
2019-06-21  5:26   ` Chunfeng Yun
2019-06-21 13:44     ` Alan Cooper
2019-06-20 21:09 ` [PATCH 3/6] usb: bdc: driver may fail to get USB PHY Al Cooper
2019-06-21  5:39   ` Chunfeng Yun
2019-06-21 13:39     ` Alan Cooper
2019-06-20 21:09 ` [PATCH 4/6] usb: bdc: Fix bug causing crash after multiple disconnects Al Cooper
2019-06-20 21:09 ` [PATCH 5/6] dt-bindings: usb: bdc: Update compatible strings Al Cooper
2019-07-09 20:14   ` Rob Herring
2019-06-20 21:09 ` [PATCH 6/6] usb: bdc: Update compatible match strings Al Cooper
2019-06-21  8:28   ` Sergei Shtylyov
2019-06-21 13:47     ` Alan Cooper

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