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rapidio: add device access check into the enumeration

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Add explicit device access check before performing device enumeration.
This gives a chance to clear possible link error conditions by issuing
safe maintenance read request(s).

Signed-off-by: Alexandre Bounine <[email protected]>
Cc: Thomas Moll <[email protected]>
Cc: Matt Porter <[email protected]>
Cc: Li Yang <[email protected]>
Cc: Kumar Gala <[email protected]>
Cc: Micha Nelissen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Alexandre Bounine 2010-10-27 15:34:32 -07:00 • committed by Linus Torvalds
commit e274e0ed0a
3 changed files with 9 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

6
drivers/rapidio/rio-scan.c
View file

@ -762,6 +762,12 @@ static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
u16 destid;
int tmp;
if (rio_mport_chk_dev_access(port,
RIO_ANY_DESTID(port->sys_size), hopcount)) {
pr_debug("RIO: device access check failed\n");
return -1;
}
if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
pr_debug("RIO: PE already discovered by this host\n");
/*

2
drivers/rapidio/rio.c
View file

@ -546,7 +546,7 @@ err_out:
* @destid: Device destination ID in network
* @hopcount: Number of hops into the network
*/
static int
int
rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount)
{
int i = 0;

2
drivers/rapidio/rio.h
View file

@ -24,6 +24,8 @@ extern u32 rio_mport_get_physefb(struct rio_mport *port, int local,
u16 destid, u8 hopcount);
extern u32 rio_mport_get_efb(struct rio_mport *port, int local, u16 destid,
u8 hopcount, u32 from);
extern int rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid,
u8 hopcount);
extern int rio_create_sysfs_dev_files(struct rio_dev *rdev);
extern int rio_enum_mport(struct rio_mport *mport);
extern int rio_disc_mport(struct rio_mport *mport);