| Message ID | 20240905220214.738506-7-bvanassche@acm.org |
|---|---|
| State | New |
| Headers | show |
| Series | Simplify the UFS driver initialization code | expand |
On 9/5/2024 3:01 PM, Bart Van Assche wrote: > Move the ufshcd_device_init(hba, true) call from ufshcd_async_scan() > into ufshcd_init(). This patch prepares for moving both scsi_add_host() > calls into ufshcd_add_scsi_host(). Calling ufshcd_device_init() from > ufshcd_init() without holding hba->host_sem is safe. This is safe because > hba->host_sem serializes core code and sysfs callbacks. The > ufshcd_device_init() call is moved before the scsi_add_host() call and > hence happens before any SCSI sysfs attributes are created. > > Signed-off-by: Bart Van Assche <bvanassche@acm.org> > --- > drivers/ufs/core/ufshcd.c | 9 +++++---- > 1 file changed, 5 insertions(+), 4 deletions(-) > > diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c > index 6e3cffcdf9a6..843566720afa 100644 > --- a/drivers/ufs/core/ufshcd.c > +++ b/drivers/ufs/core/ufshcd.c > @@ -8908,10 +8908,7 @@ static void ufshcd_async_scan(void *data, async_cookie_t cookie) > int ret; > > down(&hba->host_sem); > - /* Initialize hba, detect and initialize UFS device */ > - ret = ufshcd_device_init(hba, /*init_dev_params=*/true); > - if (ret == 0) > - ret = ufshcd_probe_hba(hba); > + ret = ufshcd_probe_hba(hba); > up(&hba->host_sem); > if (ret) > goto out; > @@ -10605,6 +10602,10 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) > */ > ufshcd_set_ufs_dev_active(hba); > > + err = ufshcd_device_init(hba, /*init_dev_params=*/true); > + if (err) > + goto out_disable; > + In SDB mode, the order of execution for these two functions changed by this patch. In the original code, the scsi_add_host() happens first, then the code within ufshcd_post_device_init(). Here it is the opposite. However, it seems the order can be swapped without any issue. > err = ufshcd_add_scsi_host(hba); > if (err) > goto out_disable; >
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index 6e3cffcdf9a6..843566720afa 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -8908,10 +8908,7 @@ static void ufshcd_async_scan(void *data, async_cookie_t cookie) int ret; down(&hba->host_sem); - /* Initialize hba, detect and initialize UFS device */ - ret = ufshcd_device_init(hba, /*init_dev_params=*/true); - if (ret == 0) - ret = ufshcd_probe_hba(hba); + ret = ufshcd_probe_hba(hba); up(&hba->host_sem); if (ret) goto out; @@ -10605,6 +10602,10 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) */ ufshcd_set_ufs_dev_active(hba); + err = ufshcd_device_init(hba, /*init_dev_params=*/true); + if (err) + goto out_disable; + err = ufshcd_add_scsi_host(hba); if (err) goto out_disable;
Move the ufshcd_device_init(hba, true) call from ufshcd_async_scan() into ufshcd_init(). This patch prepares for moving both scsi_add_host() calls into ufshcd_add_scsi_host(). Calling ufshcd_device_init() from ufshcd_init() without holding hba->host_sem is safe. This is safe because hba->host_sem serializes core code and sysfs callbacks. The ufshcd_device_init() call is moved before the scsi_add_host() call and hence happens before any SCSI sysfs attributes are created. Signed-off-by: Bart Van Assche <bvanassche@acm.org> --- drivers/ufs/core/ufshcd.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)