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From 2c1ea139e754820b55f58bdc32f3376671c453db Mon Sep 17 00:00:00 2001
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From: Vladimir 'phcoder' Serbinenko <phcoder@gmail.com>
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Date: Sun, 20 Jan 2013 22:45:53 +0100
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Subject: [PATCH 120/482] Split long USB transfers into short ones.
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---
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ChangeLog | 4 ++++
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grub-core/bus/usb/usbtrans.c | 20 ++++++++++++++++----
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include/grub/usbtrans.h | 2 ++
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3 files changed, 22 insertions(+), 4 deletions(-)
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diff --git a/ChangeLog b/ChangeLog
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index 4d09825..c8edf73 100644
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--- a/ChangeLog
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+++ b/ChangeLog
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@@ -1,3 +1,7 @@
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+2013-01-20 Aleš Nesrsta <starous@volny.cz>
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+
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+ Split long USB transfers into short ones.
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+
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2013-01-20 Andrey Borzenkov <arvidjaar@gmail.com>
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* docs/grub.texi (Simple configuration): Clarify GRUB_HIDDEN_TIMEOUT
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diff --git a/grub-core/bus/usb/usbtrans.c b/grub-core/bus/usb/usbtrans.c
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index 167fae5..154c72d 100644
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--- a/grub-core/bus/usb/usbtrans.c
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+++ b/grub-core/bus/usb/usbtrans.c
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@@ -351,11 +351,23 @@ grub_usb_err_t
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grub_usb_bulk_read (grub_usb_device_t dev,
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int endpoint, grub_size_t size, char *data)
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{
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- grub_size_t actual;
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+ grub_size_t actual, transferred;
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grub_usb_err_t err;
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- err = grub_usb_bulk_readwrite (dev, endpoint, size, data,
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- GRUB_USB_TRANSFER_TYPE_IN, 1000, &actual);
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- if (!err && actual != size)
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+ grub_size_t current_size, position;
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+
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+ for (position = 0, transferred = 0;
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+ position < size; position += MAX_USB_TRANSFER_LEN)
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+ {
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+ current_size = size - position;
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+ if (current_size >= MAX_USB_TRANSFER_LEN)
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+ current_size = MAX_USB_TRANSFER_LEN;
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+ err = grub_usb_bulk_readwrite (dev, endpoint, current_size,
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+ &data[position], GRUB_USB_TRANSFER_TYPE_IN, 1000, &actual);
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+ transferred += actual;
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+ if (err || (current_size != actual) ) break;
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+ }
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+
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+ if (!err && transferred != size)
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err = GRUB_USB_ERR_DATA;
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return err;
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}
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diff --git a/include/grub/usbtrans.h b/include/grub/usbtrans.h
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index 5ee276d..5429007 100644
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--- a/include/grub/usbtrans.h
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+++ b/include/grub/usbtrans.h
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@@ -19,6 +19,8 @@
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#ifndef GRUB_USBTRANS_H
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#define GRUB_USBTRANS_H 1
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+#define MAX_USB_TRANSFER_LEN 0x0800
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+
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typedef enum
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{
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GRUB_USB_TRANSFER_TYPE_IN,
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--
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1.8.2.1
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