Patch "powerpc/pseries: make max polling consistent for longer H_CALLs" has been added to the 6.8-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    powerpc/pseries: make max polling consistent for longer H_CALLs

to the 6.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     powerpc-pseries-make-max-polling-consistent-for-long.patch
and it can be found in the queue-6.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 4e7e86a87bc2907cb0c352c01a9c164f6c665d24
Author: Nayna Jain <nayna@xxxxxxxxxxxxx>
Date:   Wed Apr 17 23:12:30 2024 -0400

    powerpc/pseries: make max polling consistent for longer H_CALLs
    
    [ Upstream commit 784354349d2c988590c63a5a001ca37b2a6d4da1 ]
    
    Currently, plpks_confirm_object_flushed() function polls for 5msec in
    total instead of 5sec.
    
    Keep max polling time consistent for all the H_CALLs, which take longer
    than expected, to be 5sec. Also, make use of fsleep() everywhere to
    insert delay.
    
    Reported-by: Nageswara R Sastry <rnsastry@xxxxxxxxxxxxx>
    Fixes: 2454a7af0f2a ("powerpc/pseries: define driver for Platform KeyStore")
    Signed-off-by: Nayna Jain <nayna@xxxxxxxxxxxxx>
    Tested-by: Nageswara R Sastry <rnsastry@xxxxxxxxxxxxx>
    Reviewed-by: Andrew Donnellan <ajd@xxxxxxxxxxxxx>
    Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
    Link: https://msgid.link/20240418031230.170954-1-nayna@xxxxxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/arch/powerpc/include/asm/plpks.h b/arch/powerpc/include/asm/plpks.h
index 23b77027c9163..7a84069759b03 100644
--- a/arch/powerpc/include/asm/plpks.h
+++ b/arch/powerpc/include/asm/plpks.h
@@ -44,9 +44,8 @@
 #define PLPKS_MAX_DATA_SIZE		4000
 
 // Timeouts for PLPKS operations
-#define PLPKS_MAX_TIMEOUT		5000 // msec
-#define PLPKS_FLUSH_SLEEP		10 // msec
-#define PLPKS_FLUSH_SLEEP_RANGE		400
+#define PLPKS_MAX_TIMEOUT		(5 * USEC_PER_SEC)
+#define PLPKS_FLUSH_SLEEP		10000 // usec
 
 struct plpks_var {
 	char *component;
diff --git a/arch/powerpc/platforms/pseries/plpks.c b/arch/powerpc/platforms/pseries/plpks.c
index febe18f251d0c..4a595493d28ae 100644
--- a/arch/powerpc/platforms/pseries/plpks.c
+++ b/arch/powerpc/platforms/pseries/plpks.c
@@ -415,8 +415,7 @@ static int plpks_confirm_object_flushed(struct label *label,
 			break;
 		}
 
-		usleep_range(PLPKS_FLUSH_SLEEP,
-			     PLPKS_FLUSH_SLEEP + PLPKS_FLUSH_SLEEP_RANGE);
+		fsleep(PLPKS_FLUSH_SLEEP);
 		timeout = timeout + PLPKS_FLUSH_SLEEP;
 	} while (timeout < PLPKS_MAX_TIMEOUT);
 
@@ -464,9 +463,10 @@ int plpks_signed_update_var(struct plpks_var *var, u64 flags)
 
 		continuetoken = retbuf[0];
 		if (pseries_status_to_err(rc) == -EBUSY) {
-			int delay_ms = get_longbusy_msecs(rc);
-			mdelay(delay_ms);
-			timeout += delay_ms;
+			int delay_us = get_longbusy_msecs(rc) * 1000;
+
+			fsleep(delay_us);
+			timeout += delay_us;
 		}
 		rc = pseries_status_to_err(rc);
 	} while (rc == -EBUSY && timeout < PLPKS_MAX_TIMEOUT);