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serial: sc16is7xx: declare SPR/TLR/XOFF2 register as volatile

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SPR shares the same address space as TLR and XOFF2. If SPR or TLR were to
be used eventually, this could lead to incorrect read value from the cache.

Prevent this potential bug by declaring SPR/TLR/XOFF2 as volatile.

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Link: https://patch.msgid.link/20251027142957.1032073-8-hugo@hugovil.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hugo Villeneuve 2025-10-27 10:29:49 -04:00 committed by Greg Kroah-Hartman
parent e0925b4a04
commit 983f91e5f1
1 changed files with 1 additions and 0 deletions
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drivers/tty/serial/sc16is7xx.c
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@ -546,6 +546,7 @@ static bool sc16is7xx_regmap_volatile(struct device *dev, unsigned int reg)
case SC16IS7XX_IIR_REG:
case SC16IS7XX_LSR_REG:
case SC16IS7XX_MSR_REG:
case SC16IS7XX_SPR_REG: /* Shared address space with TLR & XOFF2 */
case SC16IS7XX_TXLVL_REG:
case SC16IS7XX_RXLVL_REG:
case SC16IS7XX_IOSTATE_REG: