[PATCH v2] spi: Fix error code checking in spi_mem_exec_op()

[Florian Fainelli <florian.fainelli@broadcom.com>]

After commit cff49d58f57e ("spi: Unify error codes by replacing -ENOTSUPP with
-EOPNOTSUPP"), our SPI NOR flashes would stop probing with the following
visible in the kernel log:

[    2.196300] brcmstb_qspi f0440920.qspi: using bspi-mspi mode
[    2.210295] spi-nor: probe of spi1.0 failed with error -95

It turns out that the check in spi_mem_exec_op() was changed to check
for -ENOTSUPP (old error code) or -EOPNOTSUPP (new error code), but this
means that for drivers that were converted, the second condition is now
true, and we stop falling through like we used to. Fix the error to
check for neither error being neither -ENOTSUPP *nor* -EOPNOTSUPP.

Fixes: cff49d58f57e ("spi: Unify error codes by replacing -ENOTSUPP with -EOPNOTSUPP")
Reviewed-by: Michael Walle <mwalle@kernel.org>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
---
Changes in v2:

- collected R-by tags from Michael and Pratyush
- rebased against spi/for-next

 drivers/spi/spi-mem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
index c9d6d42a88f5..17b8baf749e6 100644
--- a/drivers/spi/spi-mem.c
+++ b/drivers/spi/spi-mem.c
@@ -382,7 +382,7 @@ int spi_mem_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
 		 * read path) and expect the core to use the regular SPI
 		 * interface in other cases.
 		 */
-		if (!ret || ret != -ENOTSUPP || ret != -EOPNOTSUPP) {
+		if (!ret || (ret != -ENOTSUPP && ret != -EOPNOTSUPP)) {
 			spi_mem_add_op_stats(ctlr->pcpu_statistics, op, ret);
 			spi_mem_add_op_stats(mem->spi->pcpu_statistics, op, ret);
 
-- 
2.34.1