NX842 coprocessor sets bit 3 if queue is overflow. It is just for
information to the user. So the driver prints this informative message
and ignores it.
Signed-off-by: Haren Myneni <ha...@us.ibm.com>
diff --git a/arch/powerpc/include/asm/icswx.h b/arch/powerpc/include/asm/icswx.h
index 9f8402b..d1a2a2d 100644
--- a/arch/powerpc/include/asm/icswx.h
+++ b/arch/powerpc/include/asm/icswx.h
@@ -164,6 +164,7 @@ struct coprocessor_request_block {
#define ICSWX_INITIATED (0x8)
#define ICSWX_BUSY (0x4)
#define ICSWX_REJECTED (0x2)
+#define ICSWX_BIT3 (0x1) /* undefined or set from XERSO. */
static inline int icswx(__be32 ccw, struct coprocessor_request_block *crb)
{
diff --git a/drivers/crypto/nx/nx-842-powernv.c
b/drivers/crypto/nx/nx-842-powernv.c
index 9ef51fa..321b8e8 100644
--- a/drivers/crypto/nx/nx-842-powernv.c
+++ b/drivers/crypto/nx/nx-842-powernv.c
@@ -442,6 +442,15 @@ static int nx842_powernv_function(const unsigned char *in,
unsigned int inlen,
(unsigned int)ccw,
(unsigned int)be32_to_cpu(crb->ccw));
+ /*
+ * NX842 coprocessor uses 3rd bit to report queue overflow which is
+ * not an error, just for information to user. So, ignore this bit.
+ */
+ if (ret & ICSWX_BIT3) {
+ pr_info_ratelimited("842 coprocessor queue overflow\n");
+ ret &= ~ICSWX_BIT3;
+ }
+
switch (ret) {
case ICSWX_INITIATED:
ret = wait_for_csb(wmem, csb);
--
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