diff options
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/cio/device_ops.c | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c index c77b6e06bf6..4845d64f284 100644 --- a/drivers/s390/cio/device_ops.c +++ b/drivers/s390/cio/device_ops.c @@ -704,9 +704,9 @@ EXPORT_SYMBOL(ccw_device_tm_start_timeout); int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask) { struct subchannel *sch = to_subchannel(cdev->dev.parent); - struct channel_path_desc_fmt1 desc; + struct channel_path *chp; struct chp_id chpid; - int mdc = 0, ret, i; + int mdc = 0, i; /* Adjust requested path mask to excluded varied off paths. */ if (mask) @@ -719,14 +719,20 @@ int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask) if (!(mask & (0x80 >> i))) continue; chpid.id = sch->schib.pmcw.chpid[i]; - ret = chsc_determine_fmt1_channel_path_desc(chpid, &desc); - if (ret) - return ret; - if (!desc.f) + chp = chpid_to_chp(chpid); + if (!chp) + continue; + + mutex_lock(&chp->lock); + if (!chp->desc_fmt1.f) { + mutex_unlock(&chp->lock); return 0; - if (!desc.r) + } + if (!chp->desc_fmt1.r) mdc = 1; - mdc = mdc ? min(mdc, (int)desc.mdc) : desc.mdc; + mdc = mdc ? min_t(int, mdc, chp->desc_fmt1.mdc) : + chp->desc_fmt1.mdc; + mutex_unlock(&chp->lock); } return mdc; |