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 <yangyicong@hisilicon.com>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20230801124625.63587-1-yangyicong@huawei.com
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/i2c/busses/i2c-hisi.c b/drivers/i2c/busses/i2c-hisi.c
index 1f406e6f4ece360a4c99b95a061ecd8fc8757d0d..6bdebe51ea119a297e44c172e3305095165f3bbc 100644 (file)
--- 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))