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Revision a99b646afa8a02571ea298bedca6592d818229cd authored by dingtianhong on 15 August 2017, 03:23:23 UTC, committed by David S. Miller on 15 August 2017, 05:14:50 UTC 
PCI: Disable PCIe Relaxed Ordering if unsupported
 
When bit4 is set in the PCIe Device Control register, it indicates
whether the device is permitted to use relaxed ordering.
On some platforms using relaxed ordering can have performance issues or
due to erratum can cause data-corruption. In such cases devices must avoid
using relaxed ordering.

The patch adds a new flag PCI_DEV_FLAGS_NO_RELAXED_ORDERING to indicate that
Relaxed Ordering (RO) attribute should not be used for Transaction Layer
Packets (TLP) targeted towards these affected root complexes.

This patch checks if there is any node in the hierarchy that indicates that
using relaxed ordering is not safe. In such cases the patch turns off the
relaxed ordering by clearing the capability for this device.

Signed-off-by: Casey Leedom <leedom@chelsio.com>
Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
Acked-by: Ashok Raj <ashok.raj@intel.com>
Acked-by: Alexander Duyck <alexander.h.duyck@intel.com>
Acked-by: Casey Leedom <leedom@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Raw File
stream.h 
#ifndef __USBAUDIO_STREAM_H
#define __USBAUDIO_STREAM_H

int snd_usb_parse_audio_interface(struct snd_usb_audio *chip,
				  int iface_no);

int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
			     int stream,
			     struct audioformat *fp);

#endif /* __USBAUDIO_STREAM_H */
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