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crypto: nx-842 - Mask XERS0 bit in return value

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NX842 coprocessor sets 3rd bit in CR register with XER[S0] which is
nothing to do with NX request. Since this bit can be set with other
valuable return status, mast this bit.

One of other bits (INITIATED, BUSY or REJECTED) will be returned for
any given NX request.

Signed-off-by: Haren Myneni <haren@us.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Haren Myneni 2015-12-13 03:30:41 -08:00 committed by Herbert Xu
parent 81b312f11d
commit 6333ed8f26
2 changed files with 9 additions and 4 deletions
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1
arch/powerpc/include/asm/icswx.h
View file

@ -164,6 +164,7 @@ struct coprocessor_request_block {
#define ICSWX_INITIATED (0x8)
#define ICSWX_BUSY (0x4)
#define ICSWX_REJECTED (0x2)
#define ICSWX_XERS0 (0x1) /* undefined or set from XERSO. */
static inline int icswx(__be32 ccw, struct coprocessor_request_block *crb)
{

12
drivers/crypto/nx/nx-842-powernv.c
View file

@ -442,6 +442,14 @@ static int nx842_powernv_function(const unsigned char *in, unsigned int inlen,
(unsigned int)ccw,
(unsigned int)be32_to_cpu(crb->ccw));
/*
* NX842 coprocessor sets 3rd bit in CR register with XER[S0].
* XER[S0] is the integer summary overflow bit which is nothing
* to do NX. Since this bit can be set with other return values,
* mask this bit.
*/
ret &= ~ICSWX_XERS0;
switch (ret) {
case ICSWX_INITIATED:
ret = wait_for_csb(wmem, csb);
@ -454,10 +462,6 @@ static int nx842_powernv_function(const unsigned char *in, unsigned int inlen,
pr_err_ratelimited("ICSWX rejected\n");
ret = -EPROTO;
break;
default:
pr_err_ratelimited("Invalid ICSWX return code %x\n", ret);
ret = -EPROTO;
break;
}
if (!ret)