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wil6210: Fix division by zero in wil_vring_debugfs_show

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On some platforms get_cycles() implemented to allways return 0.
On such platforms "Division by zero" bug was triggered.

Signed-off-by: Boris Sorochkin <boriss@codeaurora.org>
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Boris Sorochkin 2015-02-15 14:02:35 +02:00 committed by Kalle Valo
parent 0436fd9a2d
commit 8f55cbec7f
1 changed files with 13 additions and 6 deletions
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19
drivers/net/wireless/ath/wil6210/debugfs.c
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@ -103,23 +103,30 @@ static int wil_vring_debugfs_show(struct seq_file *s, void *data)
% vring->size;
int avail = vring->size - used - 1;
char name[10];
char sidle[10];
/* performance monitoring */
cycles_t now = get_cycles();
uint64_t idle = txdata->idle * 100;
uint64_t total = now - txdata->begin;
do_div(idle, total);
if (total != 0) {
do_div(idle, total);
snprintf(sidle, sizeof(sidle), "%3d%%",
(int)idle);
} else {
snprintf(sidle, sizeof(sidle), "N/A");
}
txdata->begin = now;
txdata->idle = 0ULL;
snprintf(name, sizeof(name), "tx_%2d", i);
seq_printf(s,
"\n%pM CID %d TID %d BACK([%d] %d TU A%s) [%3d|%3d] idle %3d%%\n",
wil->sta[cid].addr, cid, tid,
txdata->agg_wsize, txdata->agg_timeout,
txdata->agg_amsdu ? "+" : "-",
used, avail, (int)idle);
"\n%pM CID %d TID %d BACK([%d] %d TU A%s) [%3d|%3d] idle %s\n",
wil->sta[cid].addr, cid, tid,
txdata->agg_wsize, txdata->agg_timeout,
txdata->agg_amsdu ? "+" : "-",
used, avail, sidle);
wil_print_vring(s, wil, name, vring, '_', 'H');
}