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authorAlexandre Bounine <alexandre.bounine@idt.com>2010-10-27 15:34:32 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-27 18:03:16 -0700
commite274e0ed0a2ac31d5eaf7c891e4e1d99197517b2 (patch)
treecae2c7911b21f8ddbf52ee4fdef6673997240529 /drivers/rapidio/rio-scan.c
parent6429cd49f45450cd77a57b70b0dfa98fe2794da0 (diff)
downloadop-kernel-dev-e274e0ed0a2ac31d5eaf7c891e4e1d99197517b2.zip
op-kernel-dev-e274e0ed0a2ac31d5eaf7c891e4e1d99197517b2.tar.gz
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: 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>
Diffstat (limited to 'drivers/rapidio/rio-scan.c')
-rw-r--r--drivers/rapidio/rio-scan.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/rapidio/rio-scan.c b/drivers/rapidio/rio-scan.c
index d2ea018..e3efdf9 100644
--- a/drivers/rapidio/rio-scan.c
+++ b/drivers/rapidio/rio-scan.c
@@ -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");
/*
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