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s390/cio: update chpid descriptor after resource accessibility event 

commit af2e460ade 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@vger.kernel.org>
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Sebastian Ott 2018-04-11 11:21:17 +02:00 committed by Greg Kroah-Hartman
parent a75bf6f717
commit 3b5c2e1d16
1 changed files with 11 additions and 3 deletions
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14
drivers/s390/cio/chsc.c
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@ -451,6 +451,7 @@ static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
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(struct chsc_sei_nt0_area *sei_area)
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) {