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Split long USB transfers into short ones.

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2013-01-20 22:45:53 +01:00
parent 8eb8284d2d
commit b879aa7b47
3 changed files with 22 additions and 4 deletions
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20
grub-core/bus/usb/usbtrans.c
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@ -351,11 +351,23 @@ grub_usb_err_t
grub_usb_bulk_read (grub_usb_device_t dev,
int endpoint, grub_size_t size, char *data)
{
grub_size_t actual;
grub_size_t actual, transferred;
grub_usb_err_t err;
err = grub_usb_bulk_readwrite (dev, endpoint, size, data,
GRUB_USB_TRANSFER_TYPE_IN, 1000, &actual);
if (!err && actual != size)
grub_size_t current_size, position;
for (position = 0, transferred = 0;
position < size; position += MAX_USB_TRANSFER_LEN)
{
current_size = size - position;
if (current_size >= MAX_USB_TRANSFER_LEN)
current_size = MAX_USB_TRANSFER_LEN;
err = grub_usb_bulk_readwrite (dev, endpoint, current_size,
&data[position], GRUB_USB_TRANSFER_TYPE_IN, 1000, &actual);
transferred += actual;
if (err || (current_size != actual) ) break;
}
if (!err && transferred != size)
err = GRUB_USB_ERR_DATA;
return err;
}