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spi: sh-msiof: Fix invalid SPI use during system suspend 

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.

Signed-off-by: Gaku Inami <gaku.inami.xw@bp.renesas.com>
Signed-off-by: Hiromitsu Yamasaki <hiromitsu.yamasaki.ym@renesas.com>
[geert: Cleanup, reword]
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
This commit is contained in:
Gaku Inami 2018-09-05 10:49:36 +02:00 committed by Mark Brown
parent 1723c3155f
commit ffa69d6a16
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1 changed files with 25 additions and 0 deletions
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25
drivers/spi/spi-sh-msiof.c
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@ -1426,12 +1426,37 @@ static const struct platform_device_id spi_driver_ids[] = {
};
MODULE_DEVICE_TABLE(platform, spi_driver_ids);
#ifdef CONFIG_PM_SLEEP
static int sh_msiof_spi_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct sh_msiof_spi_priv *p = platform_get_drvdata(pdev);
return spi_master_suspend(p->master);
}
static int sh_msiof_spi_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct sh_msiof_spi_priv *p = platform_get_drvdata(pdev);
return spi_master_resume(p->master);
}
static SIMPLE_DEV_PM_OPS(sh_msiof_spi_pm_ops, sh_msiof_spi_suspend,
sh_msiof_spi_resume);
#define DEV_PM_OPS &sh_msiof_spi_pm_ops
#else
#define DEV_PM_OPS NULL
#endif /* CONFIG_PM_SLEEP */
static struct platform_driver sh_msiof_spi_drv = {
.probe = sh_msiof_spi_probe,
.remove = sh_msiof_spi_remove,
.id_table = spi_driver_ids,
.driver = {
.name = "spi_sh_msiof",
.pm = DEV_PM_OPS,
.of_match_table = of_match_ptr(sh_msiof_match),
},
};