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usb: misc: usbtest: fix pattern tests for scatterlists.

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commit cdc77c82a8286b1181b81b6e5ef60c8e83ded7bc upstream.

The current implemenentation restart the sent pattern for each entry in
the sg list. The receiving end expects a continuous pattern, and test
will fail unless scatterilst entries happen to be aligned with the
pattern

Fix this by calculating the pattern byte based on total sent size
instead of just the current sg entry.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Fixes: 8b5249019352 ("[PATCH] USB: usbtest: scatterlist OUT data pattern testing")
Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2016-05-02 11:39:03 +03:00 committed by Greg Kroah-Hartman
parent 51c312792d
commit e3a037a5b8
1 changed files with 3 additions and 1 deletions
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4
drivers/usb/misc/usbtest.c
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@ -505,6 +505,7 @@ static struct scatterlist *
alloc_sglist(int nents, int max, int vary, struct usbtest_dev *dev, int pipe)
{
struct scatterlist *sg;
unsigned int n_size = 0;
unsigned i;
unsigned size = max;
unsigned maxpacket =
@ -537,7 +538,8 @@ alloc_sglist(int nents, int max, int vary, struct usbtest_dev *dev, int pipe)
break;
case 1:
for (j = 0; j < size; j++)
*buf++ = (u8) ((j % maxpacket) % 63);
*buf++ = (u8) (((j + n_size) % maxpacket) % 63);
n_size += size;
break;
}