6.1-stable review patch. If anyone has any objections, please let me know.
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From: Hugo Villeneuve hvilleneuve@dimonoff.com
commit f6959c5217bd799bcb770b95d3c09b3244e175c6 upstream.
Remove global struct regmap so that it is more obvious that this regmap is to be used only in the probe function.
Also add a comment to that effect in probe function.
Fixes: 3837a0379533 ("serial: sc16is7xx: improve regmap debugfs by using one regmap per port") Cc: stable@vger.kernel.org Suggested-by: Andy Shevchenko andy.shevchenko@gmail.com Signed-off-by: Hugo Villeneuve hvilleneuve@dimonoff.com Link: https://lore.kernel.org/r/20231211171353.2901416-3-hugo@hugovil.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/sc16is7xx.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-)
--- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -335,7 +335,6 @@ struct sc16is7xx_one {
struct sc16is7xx_port { const struct sc16is7xx_devtype *devtype; - struct regmap *regmap; struct clk *clk; #ifdef CONFIG_GPIOLIB struct gpio_chip gpio; @@ -1415,7 +1414,8 @@ static int sc16is7xx_setup_gpio_chip(str /* * Configure ports designated to operate as modem control lines. */ -static int sc16is7xx_setup_mctrl_ports(struct sc16is7xx_port *s) +static int sc16is7xx_setup_mctrl_ports(struct sc16is7xx_port *s, + struct regmap *regmap) { int i; int ret; @@ -1444,7 +1444,7 @@ static int sc16is7xx_setup_mctrl_ports(s
if (s->mctrl_mask) regmap_update_bits( - s->regmap, + regmap, SC16IS7XX_IOCONTROL_REG, SC16IS7XX_IOCONTROL_MODEM_A_BIT | SC16IS7XX_IOCONTROL_MODEM_B_BIT, s->mctrl_mask); @@ -1476,6 +1476,10 @@ static int sc16is7xx_probe(struct device * This device does not have an identification register that would * tell us if we are really connected to the correct device. * The best we can do is to check if communication is at all possible. + * + * Note: regmap[0] is used in the probe function to access registers + * common to all channels/ports, as it is guaranteed to be present on + * all variants. */ ret = regmap_read(regmaps[0], SC16IS7XX_LSR_REG, &val); if (ret < 0) @@ -1511,7 +1515,6 @@ static int sc16is7xx_probe(struct device return -EINVAL; }
- s->regmap = regmaps[0]; s->devtype = devtype; dev_set_drvdata(dev, s); mutex_init(&s->efr_lock); @@ -1526,7 +1529,7 @@ static int sc16is7xx_probe(struct device sched_set_fifo(s->kworker_task);
/* reset device, purging any pending irq / data */ - regmap_write(s->regmap, SC16IS7XX_IOCONTROL_REG, + regmap_write(regmaps[0], SC16IS7XX_IOCONTROL_REG, SC16IS7XX_IOCONTROL_SRESET_BIT);
for (i = 0; i < devtype->nr_uart; ++i) { @@ -1606,7 +1609,7 @@ static int sc16is7xx_probe(struct device s->p[u].irda_mode = true; }
- ret = sc16is7xx_setup_mctrl_ports(s); + ret = sc16is7xx_setup_mctrl_ports(s, regmaps[0]); if (ret) goto out_ports;