plpks_confirm_object_flushed() uses the H_PKS_CONFIRM_OBJECT_FLUSHED hcall
to check whether changes to an object in the Platform KeyStore have been
flushed to non-volatile storage.
The hcall returns two output values, the return code and the flush status.
plpks_confirm_object_flushed() polls the hcall until either the flush
status has updated, the return code is an error, or a timeout has been
exceeded.
While we're still polling, the hcall is returning H_SUCCESS (0) as the
return code. In the timeout case, this means that upon exiting the polling
loop, rc is 0, and therefore 0 is returned to the user.
Handle the timeout case separately and return ETIMEDOUT if triggered.
Fixes: 2454a7af0f2a ("powerpc/pseries: define driver for Platform KeyStore")
Reported-by: Benjamin Gray <bg...@linux.ibm.com>
Signed-off-by: Andrew Donnellan <a...@linux.ibm.com>
---
arch/powerpc/platforms/pseries/plpks.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/platforms/pseries/plpks.c
b/arch/powerpc/platforms/pseries/plpks.c
index 4edd1585e245..cb93062e8223 100644
--- a/arch/powerpc/platforms/pseries/plpks.c
+++ b/arch/powerpc/platforms/pseries/plpks.c
@@ -248,6 +248,7 @@ static int plpks_confirm_object_flushed(struct label *label,
struct plpks_auth *auth)
{
unsigned long retbuf[PLPAR_HCALL_BUFSIZE] = { 0 };
+ bool timed_out = true;
u64 timeout = 0;
u8 status;
int rc;
@@ -259,20 +260,26 @@ static int plpks_confirm_object_flushed(struct label
*label,
status = retbuf[0];
if (rc) {
+ timed_out = false;
if (rc == H_NOT_FOUND && status == 1)
rc = 0;
break;
}
- if (!rc && status == 1)
+ if (!rc && status == 1) {
+ timed_out = false;
break;
+ }
usleep_range(PKS_FLUSH_SLEEP,
PKS_FLUSH_SLEEP + PKS_FLUSH_SLEEP_RANGE);
timeout = timeout + PKS_FLUSH_SLEEP;
} while (timeout < PKS_FLUSH_MAX_TIMEOUT);
- rc = pseries_status_to_err(rc);
+ if (timed_out)
+ rc = -ETIMEDOUT;
+ else
+ rc = pseries_status_to_err(rc);
return rc;
}
--
2.38.1
