diff options
| author | Li Jun <jun.li@freescale.com> | 2015-11-23 15:44:31 +0800 |
|---|---|---|
| committer | Nitin Garg <nitin.garg@nxp.com> | 2016-01-14 11:02:23 -0600 |
| commit | 6ca8fd86e7974e3f96ec7ad9852e6ba41736af15 (patch) | |
| tree | 68fa1796c9deeb9ea88f312e10e5a6ab009e8de4 /include/linux/usb | |
| parent | 0b205e36656552e477d0968ca7f95412ff64ea2e (diff) | |
MLK-11891-1 usb: otg-fsm: allocate DMA buffer for host request flag separately
HNP polling need a one byte buffer for usb control transfer via DMA read,
currently using a data field in a structure for DMA buffer may cause cache
incoherent issue, because the cache line for the DMA buffer also contains
other data in this structure, while dma from device is outstanding, the
access on other data in the same cache line will cause we get the old data
before DMA. This patch change the host_request_flag to be a pointer, its
memory will be allocated through kmalloc by controller driver, with this
way, the DMA buffer can be properly aligned and padded.
Signed-off-by: Li Jun <jun.li@freescale.com>
Diffstat (limited to 'include/linux/usb')
| -rw-r--r-- | include/linux/usb/otg-fsm.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/usb/otg-fsm.h b/include/linux/usb/otg-fsm.h index 89cce2362415..aa5ba16c3d42 100644 --- a/include/linux/usb/otg-fsm.h +++ b/include/linux/usb/otg-fsm.h @@ -140,7 +140,7 @@ struct otg_fsm { /* Current usb protocol used: 0:undefine; 1:host; 2:client */ int protocol; struct mutex lock; - u8 host_req_flag; + u8 *host_req_flag; }; struct otg_fsm_ops { |