fsi: scom: Don't abort operations for minor errors

commit 8919dfcb31161fae7d607bbef5247e5e82fd6457 upstream.

The scom driver currently fails out of operations if certain system
errors are flagged in the status register; system checkstop, special
attention, or recoverable error. These errors won't impact the ability
of the scom engine to perform operations, so the driver should continue
under these conditions.
Also, don't do a PIB reset for these conditions, since it won't help.

Fixes: 6b293258cded ("fsi: scom: Major overhaul")
Signed-off-by: Eddie James <eajames@linux.ibm.com>
Cc: stable <stable@vger.kernel.org>
Acked-by: Jeremy Kerr <jk@ozlabs.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20190827041249.13381-1-jk@ozlabs.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/fsi/fsi-scom.c b/drivers/fsi/fsi-scom.c
index df94021dd9d12bc32b18873076151d3fccbae5c7..fdc0e458dbaaf9c2b59488e6b1a4d7102926657a 100644 (file)
--- a/drivers/fsi/fsi-scom.c
+++ b/drivers/fsi/fsi-scom.c
@@ -47,8 +47,7 @@
 #define SCOM_STATUS_PIB_RESP_MASK      0x00007000
 #define SCOM_STATUS_PIB_RESP_SHIFT     12
 
-#define SCOM_STATUS_ANY_ERR            (SCOM_STATUS_ERR_SUMMARY | \
-                                        SCOM_STATUS_PROTECTION | \
+#define SCOM_STATUS_ANY_ERR            (SCOM_STATUS_PROTECTION | \
                                         SCOM_STATUS_PARITY |     \
                                         SCOM_STATUS_PIB_ABORT | \
                                         SCOM_STATUS_PIB_RESP_MASK)
@@ -260,11 +259,6 @@ static int handle_fsi2pib_status(struct scom_device *scom, uint32_t status)
        /* Return -EBUSY on PIB abort to force a retry */
        if (status & SCOM_STATUS_PIB_ABORT)
                return -EBUSY;
-       if (status & SCOM_STATUS_ERR_SUMMARY) {
-               fsi_device_write(scom->fsi_dev, SCOM_FSI2PIB_RESET_REG, &dummy,
-                                sizeof(uint32_t));
-               return -EIO;
-       }
        return 0;
 }