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staging: most: i2c: avoid polling in case of misconfig 

This patch prevents the driver from falling back to polling mode
in case of IRQ misconfiguration.

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Gromm 2018-05-08 11:44:57 +02:00 committed by Greg Kroah-Hartman
parent 795ce21892
commit cd2e7148e7
1 changed files with 10 additions and 8 deletions
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18
drivers/staging/most/i2c/i2c.c
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@ -90,22 +90,24 @@ static int configure_channel(struct most_interface *most_iface,
}
if (channel_config->direction == MOST_CH_RX) {
dev->polling_mode = polling_req || dev->client->irq <= 0;
dev->polling_mode = polling_req;
if (!dev->polling_mode) {
pr_info("Requesting IRQ: %d\n", dev->client->irq);
if (dev->client->irq <= 0) {
pr_err("bad irq: %d\n", dev->client->irq);
return -ENOENT;
}
dev->rx.int_disabled = false;
ret = request_irq(dev->client->irq, most_irq_handler, 0,
dev->client->name, dev);
if (ret) {
pr_info("IRQ request failed: %d, falling back to polling\n",
ret);
dev->polling_mode = true;
pr_err("request_irq(%d) failed: %d\n",
dev->client->irq, ret);
return ret;
}
} else if (scan_rate) {
pr_info("polling rate is %d Hz\n", scan_rate);
}
}
if ((channel_config->direction == MOST_CH_RX) && (dev->polling_mode)) {
pr_info("Using polling at rate: %d times/sec\n", scan_rate);
}
dev->is_open[ch_idx] = true;
return 0;