From: Yicong Yang Date: Tue, 1 Aug 2023 12:46:25 +0000 (+0800) Subject: i2c: hisi: Only handle the interrupt of the driver's transfer X-Git-Tag: v5.15.128~69 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=184f1b68bb99b5927ab63aefb4a58ec2f9cc6ca9;p=thirdparty%2Fkernel%2Fstable.git i2c: hisi: Only handle the interrupt of the driver's transfer commit fff67c1b17ee093947bdcbac6f64d072e644159a upstream. The controller may be shared with other port, for example the firmware. Handle the interrupt from other sources will cause crash since some data are not initialized. So only handle the interrupt of the driver's transfer and discard others. Fixes: d62fbdb99a85 ("i2c: add support for HiSilicon I2C controller") Signed-off-by: Yicong Yang Reviewed-by: Andi Shyti Link: https://lore.kernel.org/r/20230801124625.63587-1-yangyicong@huawei.com Signed-off-by: Wolfram Sang Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/i2c/busses/i2c-hisi.c b/drivers/i2c/busses/i2c-hisi.c index 1f406e6f4ece3..6bdebe51ea119 100644 --- a/drivers/i2c/busses/i2c-hisi.c +++ b/drivers/i2c/busses/i2c-hisi.c @@ -329,6 +329,14 @@ static irqreturn_t hisi_i2c_irq(int irq, void *context) struct hisi_i2c_controller *ctlr = context; u32 int_stat; + /* + * Don't handle the interrupt if cltr->completion is NULL. We may + * reach here because the interrupt is spurious or the transfer is + * started by another port (e.g. firmware) rather than us. + */ + if (!ctlr->completion) + return IRQ_NONE; + int_stat = readl(ctlr->iobase + HISI_I2C_INT_MSTAT); hisi_i2c_clear_int(ctlr, int_stat); if (!(int_stat & HISI_I2C_INT_ALL))