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Fix last_trans determination

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2010-06-02 04:52:35 +02:00
parent a18c783473
commit 2325800310
1 changed files with 13 additions and 5 deletions
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18
bus/usb/ohci.c
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@ -671,15 +671,21 @@ grub_ohci_transfer (grub_usb_controller_t dev,
/* Remember last processed transaction (TD) - it is necessary for
* proper setting of toggle bit in next transaction. */
transfer->last_trans = (tderr_addr - td_list_addr) / sizeof (*td_list);
transfer->last_trans = ((tderr_addr - td_list_addr) / sizeof (*td_list));
grub_dprintf("ohci", "tderr_addr=0x%x, td_list_addr=0x%x,\n",
tderr_addr, td_list_addr);
if ((ed->td_head & ~0xf) == (ed->td_tail & ~0xf))
transfer->last_trans = transfer->transcnt - 1;
/* Check correct value in last_trans */
/* It could happen if timeout happens and no TD was retired */
if (transfer->last_trans >= transfer->transcnt || !tderr_addr)
{
grub_dprintf("ohci", "tder==0 or out of TDs range!\n");
grub_dprintf("ohci", "tderr_addr=0x%x, td_list=%p,\n\t\t last_trans=%d, transcnt=%d\n",
tderr_addr, td_list, transfer->last_trans, transfer->transcnt);
grub_dprintf("ohci", "tderr==0 or out of TDs range!\n");
grub_dprintf("ohci", "last_trans=%d, transcnt=%d\n",
transfer->last_trans, transfer->transcnt);
/* We should set something valid... */
transfer->last_trans = -1; /* Probably no TD done */
tderr_addr = td_list_addr;
@ -713,6 +719,8 @@ grub_ohci_transfer (grub_usb_controller_t dev,
grub_uint8_t errcode;
grub_ohci_td_t tderr = NULL;
transfer->last_trans--;
tderr = (grub_ohci_td_t) ((char *) td_list
+ (tderr_addr - td_list_addr));