From: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Date: Fri, 27 Apr 2007 14:01:29 +0000 (+0200)
Subject: [S390] cio: observe chpid valid flag
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c9182e0f42c5646e670c2166b6d6638052d574af;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

[S390] cio: observe chpid valid flag

Check validity flag of CHPID description data before continuing with
channel-path initialization.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

diff --git a/drivers/s390/cio/chp.c b/drivers/s390/cio/chp.c
index 6e04521accd8..8a5839147f8a 100644
--- a/drivers/s390/cio/chp.c
+++ b/drivers/s390/cio/chp.c
@@ -339,6 +339,10 @@ int chp_new(struct chp_id chpid)
 	ret = chsc_determine_channel_path_description(chpid, &chp->desc);
 	if (ret)
 		goto out_free;
+	if ((chp->desc.flags & 0x80) == 0) {
+		ret = -ENODEV;
+		goto out_free;
+	}
 	/* Get channel-measurement characteristics. */
 	if (css_characteristics_avail && css_chsc_characteristics.scmc
 	    && css_chsc_characteristics.secm) {