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authorAlexandre Bounine <alexandre.bounine@idt.com>2012-10-11 02:53:59 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-11 03:50:15 +0400
commit2574740d1fe946803caa6b0c06fbb4bf397af35d (patch)
tree50bdf80ba048dd462f3b23f13a7f636401448565 /drivers/rapidio/rio.c
parentf4c9c0e83bdfab6d3de7bc9ad728d99bf6adde92 (diff)
downloadlinux-2574740d1fe946803caa6b0c06fbb4bf397af35d.tar.xz
rapidio: update asynchronous discovery initialization
Update discovery process initialization based on Andrew Morton's comments: https://lkml.org/lkml/2012/10/3/552. This update processes all enumerating mports first and schedules discovery work after that. If the initialization routine fails to allocate resources needed to execute discovery, it abandons discovery for all ports. Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Li Yang <leoli@freescale.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rapidio/rio.c')
-rw-r--r--drivers/rapidio/rio.c75
1 files changed, 47 insertions, 28 deletions
diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c
index d4bd69013c50..c17ae22567e0 100644
--- a/drivers/rapidio/rio.c
+++ b/drivers/rapidio/rio.c
@@ -1275,49 +1275,68 @@ static void __devinit disc_work_handler(struct work_struct *_work)
pr_debug("RIO: discovery work for mport %d %s\n",
work->mport->id, work->mport->name);
rio_disc_mport(work->mport);
-
- kfree(work);
}
int __devinit rio_init_mports(void)
{
struct rio_mport *port;
struct rio_disc_work *work;
- int no_disc = 0;
+ int n = 0;
+
+ if (!next_portid)
+ return -ENODEV;
+ /*
+ * First, run enumerations and check if we need to perform discovery
+ * on any of the registered mports.
+ */
list_for_each_entry(port, &rio_mports, node) {
if (port->host_deviceid >= 0)
rio_enum_mport(port);
- else if (!no_disc) {
- if (!rio_wq) {
- rio_wq = alloc_workqueue("riodisc", 0, 0);
- if (!rio_wq) {
- pr_err("RIO: unable allocate rio_wq\n");
- no_disc = 1;
- continue;
- }
- }
-
- work = kzalloc(sizeof *work, GFP_KERNEL);
- if (!work) {
- pr_err("RIO: no memory for work struct\n");
- no_disc = 1;
- continue;
- }
-
- work->mport = port;
- INIT_WORK(&work->work, disc_work_handler);
- queue_work(rio_wq, &work->work);
- }
+ else
+ n++;
+ }
+
+ if (!n)
+ goto no_disc;
+
+ /*
+ * If we have mports that require discovery schedule a discovery work
+ * for each of them. If the code below fails to allocate needed
+ * resources, exit without error to keep results of enumeration
+ * process (if any).
+ * TODO: Implement restart of dicovery process for all or
+ * individual discovering mports.
+ */
+ rio_wq = alloc_workqueue("riodisc", 0, 0);
+ if (!rio_wq) {
+ pr_err("RIO: unable allocate rio_wq\n");
+ goto no_disc;
}
- if (rio_wq) {
- pr_debug("RIO: flush discovery workqueue\n");
- flush_workqueue(rio_wq);
- pr_debug("RIO: flush discovery workqueue finished\n");
+ work = kcalloc(n, sizeof *work, GFP_KERNEL);
+ if (!work) {
+ pr_err("RIO: no memory for work struct\n");
destroy_workqueue(rio_wq);
+ goto no_disc;
}
+ n = 0;
+ list_for_each_entry(port, &rio_mports, node) {
+ if (port->host_deviceid < 0) {
+ work[n].mport = port;
+ INIT_WORK(&work[n].work, disc_work_handler);
+ queue_work(rio_wq, &work[n].work);
+ n++;
+ }
+ }
+
+ flush_workqueue(rio_wq);
+ pr_debug("RIO: destroy discovery workqueue\n");
+ destroy_workqueue(rio_wq);
+ kfree(work);
+
+no_disc:
rio_init();
return 0;