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iio: adc: tsc2046: add sanity check to avoid to big allocations 

To avoid problematic devicetree configurations. Set allocation limit
with error message and suggestion on what can be done to solve this
issue.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.kernel.org/r/20220117082852.3370869-2-o.rempel@pengutronix.de
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Oleksij Rempel 2022-01-17 09:28:52 +01:00 committed by Jonathan Cameron
parent b617693a5d
commit 576434fd93
1 changed files with 6 additions and 0 deletions
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6
drivers/iio/adc/ti-tsc2046.c
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@ -679,6 +679,12 @@ static int tsc2046_adc_setup_spi_msg(struct tsc2046_adc_priv *priv)
for (ch_idx = 0; ch_idx < priv->dcfg->num_channels; ch_idx++)
size += tsc2046_adc_group_set_layout(priv, ch_idx, ch_idx);
if (size > PAGE_SIZE) {
dev_err(&priv->spi->dev,
"Calculated scan buffer is too big. Try to reduce spi-max-frequency, settling-time-us or oversampling-ratio\n");
return -ENOSPC;
}
priv->tx = devm_kzalloc(&priv->spi->dev, size, GFP_KERNEL);
if (!priv->tx)
return -ENOMEM;