diff options
| author | Andre Werner <andre.werner@systec-electronic.com> | 2025-01-21 08:18:19 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-02-04 14:42:42 +0100 |
| commit | e8ed246ded863eb862806c5591afdcf70012ab5e (patch) | |
| tree | b793c1decf711ee0e584184acde743c3fb9f98c0 | |
| parent | 2014c95afecee3e76ca4a56956a936e23283f05b (diff) | |
serial: sc16is7xx: Fix IRQ number check behavior
The logical meaning of the previous version is wrong due to a typo.
If the IRQ equals 0, no interrupt pin is available and polling mode
shall be used.
Additionally, this fix adds a check for IRQ < 0 to increase robustness,
because documentation still says that negative IRQ values cannot be
absolutely ruled-out.
Fixes: 104c1b9dde9d ("serial: sc16is7xx: Add polling mode if no IRQ pin is available")
Signed-off-by: Andre Werner <andre.werner@systec-electronic.com>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Maarten Brock <maarten.brock@sttls.nl>
Reviewed-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Link: https://lore.kernel.org/r/20250121071819.1346672-1-andre.werner@systec-electronic.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/sc16is7xx.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index 7b51cdc274fd..560f45ed19ae 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -1561,7 +1561,7 @@ int sc16is7xx_probe(struct device *dev, const struct sc16is7xx_devtype *devtype, /* Always ask for fixed clock rate from a property. */ device_property_read_u32(dev, "clock-frequency", &uartclk); - s->polling = !!irq; + s->polling = (irq <= 0); if (s->polling) dev_dbg(dev, "No interrupt pin definition, falling back to polling mode\n"); |