mmc: meson-gx: make replace WARN_ONCE with dev_warn_once about scatterlist offset...

commit cabb1bb60e88ccaaa122ba01862403cd44e8e8f8 upstream.

Some drivers like ath10k can sometimg give an sg buffer with an offset whose alignment
is not compatible with the Amlogic DMA descriptor engine requirements.

Simply replace with dev_warn_once() to inform user this should be fixed to avoid
degraded performance.

This should be ultimately fixed in ath10k, but since it's only a performance issue
the warning should be removed.

Fixes: 79ed05e329c3 ("mmc: meson-gx: add support for descriptor chain mode")
Cc: stable@vger.kernel.org
Reported-by: Christian Hewitt <christianshewitt@gmail.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20210426175559.3110575-1-narmstrong@baylibre.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index b8b771b643cc8bfc9fb685d53936cd614104846c..1c61f0f24c09ba8c3b626c0e63155e451daea200 100644 (file)
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -258,7 +258,9 @@ static void meson_mmc_get_transfer_mode(struct mmc_host *mmc,
        for_each_sg(data->sg, sg, data->sg_len, i) {
                /* check for 8 byte alignment */
                if (sg->offset % 8) {
-                       WARN_ONCE(1, "unaligned scatterlist buffer\n");
+                       dev_warn_once(mmc_dev(mmc),
+                                     "unaligned sg offset %u, disabling descriptor DMA for transfer\n",
+                                     sg->offset);
                        return;
                }
        }