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Date: Fri, 27 Apr 2018 15:59:01 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Sebastian Ott <sebott@...ux.ibm.com>, Peter Oberparleiter <oberpar@...ux.ibm.com>, Martin Schwidefsky <schwidefsky@...ibm.com> Subject: [PATCH 4.9 71/74] s390/cio: update chpid descriptor after resource accessibility event 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sebastian Ott <sebott@...ux.ibm.com> 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. Cc: <stable@...r.kernel.org> Signed-off-by: Sebastian Ott <sebott@...ux.ibm.com> Reviewed-by: Peter Oberparleiter <oberpar@...ux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- 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 @@ -451,6 +451,7 @@ 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; @@ -463,10 +464,17 @@ 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) {
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