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interconnect: Revert to previous config if any request fails 

When consumers report their bandwidth needs with icc_set_bw(), it's
possible that the requested amount of bandwidth is not available or just
the new configuration fails to apply on some path. In this case revert to
the previous configuration and propagate the error back to the consumers
to let them know that bandwidth is not available, hardware is busy or
whatever error is returned by the interconnect platform driver.

Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Georgi Djakov 2019-01-16 18:11:03 +02:00 committed by Greg Kroah-Hartman
parent ecfbed0c5c
commit dce6d40666
1 changed files with 15 additions and 2 deletions
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17
drivers/interconnect/core.c
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@ -414,14 +414,18 @@ EXPORT_SYMBOL_GPL(of_icc_get);
int icc_set_bw(struct icc_path *path, u32 avg_bw, u32 peak_bw)
{
struct icc_node *node;
u32 old_avg, old_peak;
size_t i;
int ret;
if (!path)
if (!path || !path->num_nodes)
return 0;
mutex_lock(&icc_lock);
old_avg = path->reqs[0].avg_bw;
old_peak = path->reqs[0].peak_bw;
for (i = 0; i < path->num_nodes; i++) {
node = path->reqs[i].node;
@ -434,10 +438,19 @@ int icc_set_bw(struct icc_path *path, u32 avg_bw, u32 peak_bw)
}
ret = apply_constraints(path);
if (ret)
if (ret) {
pr_debug("interconnect: error applying constraints (%d)\n",
ret);
for (i = 0; i < path->num_nodes; i++) {
node = path->reqs[i].node;
path->reqs[i].avg_bw = old_avg;
path->reqs[i].peak_bw = old_peak;
aggregate_requests(node);
}
apply_constraints(path);
}
mutex_unlock(&icc_lock);
return ret;