| Message ID | 20230405083611.3376739-1-arnd@kernel.org |
|---|---|
| State | New |
| Headers | show |
| Series | scsi: hisi_sas: work around build failure in suspend function | expand |
Hi Arnd, 在 2023/4/5 16:36, Arnd Bergmann 写道: > From: Arnd Bergmann <arnd@arndb.de> > > The suspend/resume functions in this driver seem to have multiple > problems, the latest one just got introduced by a bugfix: > > drivers/scsi/hisi_sas/hisi_sas_v3_hw.c: In function '_suspend_v3_hw': > drivers/scsi/hisi_sas/hisi_sas_v3_hw.c:5142:39: error: 'struct dev_pm_info' has no member named 'usage_count' > 5142 | if (atomic_read(&device->power.usage_count)) { > drivers/scsi/hisi_sas/hisi_sas_v3_hw.c: In function '_suspend_v3_hw': > drivers/scsi/hisi_sas/hisi_sas_v3_hw.c:5142:39: error: 'struct dev_pm_info' has no member named 'usage_count' > 5142 | if (atomic_read(&device->power.usage_count)) { > > As far as I can tell, the 'usage_count' is not meant to be accessed > by device drivers at all, though I don't know what the driver is > supposed to do instead. Thank you for reporting the issue. There is a extreme situation that hisi_sas driver tries to resume controller when it is in the process of suspend, which will cause a deadlock. So we check usage_count of controller, and if usage_count > 0, failed to suspend to avoid the issue. But there is no common function defined in pm_runtime.h which check the usage_count of device, so use it directly (i saw the check also be used in other drivers). But i didn't realize that member usage_count is defined only under CONFIG_PM=y. > > Another problem is the use of the deprecated UNIVERSAL_DEV_PM_OPS(), > and marking functions as __maybe_unused to avoid warnings about > unused functions. This should probably be changed to using > DEFINE_RUNTIME_DEV_PM_OPS(). We use UNIVERSAL_DEV_PM_OPS() just because runtime callbacks runtime_{suspend|resume} and system callbacks {suspend|resume} use the same operations in the driver, otherwise, we need to use DEFINE_RUNTIME_DEV_PM_OPS() to define runtime callbacks and use DEFINE_SIMPLE_DEV_PM_OPS() to define system callbacks. > > Both changes require actually understanding what the driver needs to > do, and being able to test this, so instead here is the simplest > patch to make it pass the randconfig builds instead. > > Fixes: e368d38cb952 ("scsi: hisi_sas: Exit suspend state when usage count is greater than 0") > Signed-off-by: Arnd Bergmann <arnd@arndb.de> > --- > Maintainers: If possible, please revisit this to do a proper fix. > If that takes too much time, this patch can be applied as a > workaround in the meantime, and might also help in case the > e368d38cb952 patch gets backported to stable kernels. It is ok to apply the patch as a workaround as soon as possible. Reviewed-by: Xiang Chen <chenxiang66@hisilicon.com> Thanks! > --- > drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c > index d160b9b7479b..12d588454f5d 100644 > --- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c > +++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c > @@ -5139,11 +5139,13 @@ static int _suspend_v3_hw(struct device *device) > flush_workqueue(hisi_hba->wq); > interrupt_disable_v3_hw(hisi_hba); > > +#ifdef CONFIG_PM > if (atomic_read(&device->power.usage_count)) { > dev_err(dev, "PM suspend: host status cannot be suspended\n"); > rc = -EBUSY; > goto err_out; > } > +#endif > > rc = disable_host_v3_hw(hisi_hba); > if (rc) { > @@ -5162,7 +5164,9 @@ static int _suspend_v3_hw(struct device *device) > > err_out_recover_host: > enable_host_v3_hw(hisi_hba); > +#ifdef CONFIG_PM > err_out: > +#endif > interrupt_enable_v3_hw(hisi_hba); > clear_bit(HISI_SAS_REJECT_CMD_BIT, &hisi_hba->flags); > clear_bit(HISI_SAS_RESETTING_BIT, &hisi_hba->flags);
Arnd, > The suspend/resume functions in this driver seem to have multiple > problems, the latest one just got introduced by a bugfix: Applied to 6.4/scsi-staging, thanks!
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c index d160b9b7479b..12d588454f5d 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c +++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c @@ -5139,11 +5139,13 @@ static int _suspend_v3_hw(struct device *device) flush_workqueue(hisi_hba->wq); interrupt_disable_v3_hw(hisi_hba); +#ifdef CONFIG_PM if (atomic_read(&device->power.usage_count)) { dev_err(dev, "PM suspend: host status cannot be suspended\n"); rc = -EBUSY; goto err_out; } +#endif rc = disable_host_v3_hw(hisi_hba); if (rc) { @@ -5162,7 +5164,9 @@ static int _suspend_v3_hw(struct device *device) err_out_recover_host: enable_host_v3_hw(hisi_hba); +#ifdef CONFIG_PM err_out: +#endif interrupt_enable_v3_hw(hisi_hba); clear_bit(HISI_SAS_REJECT_CMD_BIT, &hisi_hba->flags); clear_bit(HISI_SAS_RESETTING_BIT, &hisi_hba->flags);