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usb: ehci: do not invalidate a NULL buffer

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Its a valid use case to call ehci_submit_async() with a NULL buffer
with length 0. E.g. from usb_set_configuration().

As invalidate_dcache_range() isn't able to judge if the address
NULL is valid or not (depending on the SoC hardware configuration it
might be valid) do the check in ehci_submit_async() as here we know
that we don't have to invalidate such a buffer.

Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
This commit is contained in:
Dirk Behme 2017-11-17 15:28:36 +01:00 • committed by Marek Vasut
parent 45157d2764
commit b3cbcd902d
1 changed files with 3 additions and 2 deletions
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5
drivers/usb/host/ehci-hcd.c
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@ -592,8 +592,9 @@ ehci_submit_async(struct usb_device *dev, unsigned long pipe, void *buffer,
* dangerous operation, it's responsibility of the calling
* code to make sure enough space is reserved.
*/
invalidate_dcache_range((unsigned long)buffer,
ALIGN((unsigned long)buffer + length, ARCH_DMA_MINALIGN));
if (buffer != NULL && length > 0)
invalidate_dcache_range((unsigned long)buffer,
ALIGN((unsigned long)buffer + length, ARCH_DMA_MINALIGN));
/* Check that the TD processing happened */
if (QT_TOKEN_GET_STATUS(token) & QT_TOKEN_STATUS_ACTIVE)