Commit e274e0ed authored by Alexandre Bounine's avatar Alexandre Bounine Committed by Linus Torvalds

rapidio: add device access check into the enumeration

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: default avatarAlexandre Bounine <alexandre.bounine@idt.com>
Cc: Thomas Moll <thomas.moll@sysgo.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Micha Nelissen <micha@neli.hopto.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6429cd49
......@@ -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");
/*
......
......@@ -546,7 +546,7 @@ rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum)
* @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;
......
......@@ -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);
......
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