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| author | Gaku Inami <gaku.inami.xw@bp.renesas.com> | 2018-09-05 11:49:36 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-10-04 03:00:54 +0300 |
| commit | d120858fca5f631195fbb7e2c2768d525d1c80da (patch) | |
| tree | 5803b116acc274c9a482333770f9905a867a4f36 /drivers/spi | |
| parent | 429773341c34cde3caacbc3992e2dcb1d7ccea86 (diff) | |
| download | linux-d120858fca5f631195fbb7e2c2768d525d1c80da.tar.xz | |
spi: sh-msiof: Fix invalid SPI use during system suspend
commit ffa69d6a16f686efe45269342474e421f2aa58b2 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.
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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-sh-msiof.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c index 0fea18ab970e..380b10c2a244 100644 --- a/drivers/spi/spi-sh-msiof.c +++ b/drivers/spi/spi-sh-msiof.c @@ -1361,12 +1361,37 @@ 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), }, }; |