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spi: rspi: Fix invalid SPI use during system suspend 

commit c1ca59c22c upstream.

If the SPI queue is running during system suspend, the system may lock
up.

Fix this by stopping/restarting the queue during system suspend/resume,
by calling spi_master_suspend()/spi_master_resume() from the PM
callbacks.  In-kernel users will receive an -ESHUTDOWN error while
system suspend/resume is in progress.

Based on a patch for sh-msiof by Gaku Inami.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Geert Uytterhoeven 2018-09-05 10:49:38 +02:00 committed by Greg Kroah-Hartman
parent 6074b71d61
commit 082e34f367
1 changed files with 24 additions and 0 deletions
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24
drivers/spi/spi-rspi.c
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@ -1352,12 +1352,36 @@ static const struct platform_device_id spi_driver_ids[] = {
MODULE_DEVICE_TABLE(platform, spi_driver_ids);
#ifdef CONFIG_PM_SLEEP
static int rspi_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct rspi_data *rspi = platform_get_drvdata(pdev);
return spi_master_suspend(rspi->master);
}
static int rspi_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct rspi_data *rspi = platform_get_drvdata(pdev);
return spi_master_resume(rspi->master);
}
static SIMPLE_DEV_PM_OPS(rspi_pm_ops, rspi_suspend, rspi_resume);
#define DEV_PM_OPS &rspi_pm_ops
#else
#define DEV_PM_OPS NULL
#endif /* CONFIG_PM_SLEEP */
static struct platform_driver rspi_driver = {
.probe = rspi_probe,
.remove = rspi_remove,
.id_table = spi_driver_ids,
.driver = {
.name = "renesas_spi",
.pm = DEV_PM_OPS,
.of_match_table = of_match_ptr(rspi_of_match),
},
};