| From: Sebastian Ott <sebott@linux.ibm.com> |
| Date: Wed, 11 Apr 2018 11:21:17 +0200 |
| Subject: s390/cio: update chpid descriptor after resource accessibility event |
| |
| commit af2e460ade0b0180d0f3812ca4f4f59cc9597f3e upstream. |
| |
| Channel path descriptors have been seen as something stable (as |
| long as the chpid is configured). Recent tests have shown that the |
| descriptor can also be altered when the link state of a channel path |
| changes. Thus it is necessary to update the descriptor during |
| handling of resource accessibility events. |
| |
| Signed-off-by: Sebastian Ott <sebott@linux.ibm.com> |
| Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com> |
| Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> |
| Signed-off-by: Ben Hutchings <ben@decadent.org.uk> |
| --- |
| drivers/s390/cio/chsc.c | 14 +++++++++++--- |
| 1 file changed, 11 insertions(+), 3 deletions(-) |
| |
| --- a/drivers/s390/cio/chsc.c |
| +++ b/drivers/s390/cio/chsc.c |
| @@ -362,6 +362,7 @@ static void chsc_process_sei_link_incide |
| |
| static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area) |
| { |
| + struct channel_path *chp; |
| struct chp_link link; |
| struct chp_id chpid; |
| int status; |
| @@ -374,10 +375,17 @@ static void chsc_process_sei_res_acc(str |
| chpid.id = sei_area->rsid; |
| /* allocate a new channel path structure, if needed */ |
| status = chp_get_status(chpid); |
| - if (status < 0) |
| - chp_new(chpid); |
| - else if (!status) |
| + if (!status) |
| return; |
| + |
| + if (status < 0) { |
| + chp_new(chpid); |
| + } else { |
| + chp = chpid_to_chp(chpid); |
| + mutex_lock(&chp->lock); |
| + chp_update_desc(chp); |
| + mutex_unlock(&chp->lock); |
| + } |
| memset(&link, 0, sizeof(struct chp_link)); |
| link.chpid = chpid; |
| if ((sei_area->vf & 0xc0) != 0) { |
