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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 <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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexandre Bounine
2010-10-27 15:34:32 -07:00
committed by Linus Torvalds
parent 6429cd49f4
commit e274e0ed0a
3 changed files with 9 additions and 1 deletions
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6
drivers/rapidio/rio-scan.c
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@@ -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");
/*