diff options
| author | Dirk Behme <dirk.behme@gmail.com> | 2017-11-17 15:28:36 +0100 |
|---|---|---|
| committer | Marek Vasut <marek.vasut+renesas@gmail.com> | 2017-11-26 02:22:36 +0100 |
| commit | b3cbcd902db7019410dfe3729a660abcb1f03ffb (patch) | |
| tree | f0524753a1a56089008956ead3ab38c2cbdbbb25 /drivers/usb/host/ehci-hcd.c | |
| parent | 45157d27644c23493ea1b5a6c9dd67572eb75c8c (diff) | |
usb: ehci: do not invalidate a NULL buffer
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>
Diffstat (limited to 'drivers/usb/host/ehci-hcd.c')
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index 80cc87c9ef..2582bf36eb 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -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) |