diff options
| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2018-09-05 10:49:38 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2018-09-05 12:40:06 +0100 |
| commit | c1ca59c22c56930b377a665fdd1b43351887830b (patch) | |
| tree | 8a20b9aa37193e855d08b24bd009c7b7f1d5962a /drivers | |
| parent | 31a5fae4c5a009898da6d177901d5328051641ff (diff) | |
| download | blackbird-obmc-linux-c1ca59c22c56930b377a665fdd1b43351887830b.tar.gz blackbird-obmc-linux-c1ca59c22c56930b377a665fdd1b43351887830b.zip | |
spi: rspi: 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.
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
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/spi-rspi.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c index 95dc4d78618d..f93a4587e3fb 100644 --- a/drivers/spi/spi-rspi.c +++ b/drivers/spi/spi-rspi.c @@ -1350,12 +1350,36 @@ 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), }, }; |
