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USB: EHCI: fix DMA deallocation bug

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This patch (as1440) fixes a bug in ehci-hcd.  ehci->periodic_size is
used to compute the size in a dma_alloc_coherent() call, but then it
gets changed later on.  As a result, the corresponding call to
dma_free_coherent() passes a different size from the original
allocation.  Fix the problem by adjusting ehci->periodic_size before
carrying out any of the memory allocations.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Larry Finger <Larry.Finger@lwfinger.net>
CC: David Brownell <david-b@pacbell.net>
CC: <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2011-01-06 10:17:09 -05:00 committed by Greg Kroah-Hartman
parent 06f1b9715c
commit f75593ceaa
1 changed files with 12 additions and 7 deletions
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19
drivers/usb/host/ehci-hcd.c
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@ -572,6 +572,8 @@ static int ehci_init(struct usb_hcd *hcd)
ehci->iaa_watchdog.function = ehci_iaa_watchdog;
ehci->iaa_watchdog.data = (unsigned long) ehci;
hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
/*
* hw default: 1K periodic list heads, one per frame.
* periodic_size can shrink by USBCMD update if hcc_params allows.
@ -579,11 +581,20 @@ static int ehci_init(struct usb_hcd *hcd)
ehci->periodic_size = DEFAULT_I_TDPS;
INIT_LIST_HEAD(&ehci->cached_itd_list);
INIT_LIST_HEAD(&ehci->cached_sitd_list);
if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
/* periodic schedule size can be smaller than default */
switch (EHCI_TUNE_FLS) {
case 0: ehci->periodic_size = 1024; break;
case 1: ehci->periodic_size = 512; break;
case 2: ehci->periodic_size = 256; break;
default: BUG();
}
}
if ((retval = ehci_mem_init(ehci, GFP_KERNEL)) < 0)
return retval;
/* controllers may cache some of the periodic schedule ... */
hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
if (HCC_ISOC_CACHE(hcc_params)) // full frame cache
ehci->i_thresh = 2 + 8;
else // N microframes cached
@ -637,12 +648,6 @@ static int ehci_init(struct usb_hcd *hcd)
/* periodic schedule size can be smaller than default */
temp &= ~(3 << 2);
temp |= (EHCI_TUNE_FLS << 2);
switch (EHCI_TUNE_FLS) {
case 0: ehci->periodic_size = 1024; break;
case 1: ehci->periodic_size = 512; break;
case 2: ehci->periodic_size = 256; break;
default: BUG();
}
}
if (HCC_LPM(hcc_params)) {
/* support link power management EHCI 1.1 addendum */