firmware: arm_sdei: Remove sdei_is_err()

sdei_is_err() is only called by sdei_to_linux_errno(). The logic of
checking on the error number is common to them. They can be combined
finely.

This removes sdei_is_err() and its logic is combined to the function
sdei_to_linux_errno(). Also, the assignment of @err to zero is also
dropped in invoke_sdei_fn() because it's always overridden afterwards.
This shouldn't cause functional changes.

Signed-off-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: James Morse <james.morse@arm.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20200922130423.10173-2-gshan@redhat.com
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/drivers/firmware/arm_sdei.c b/drivers/firmware/arm_sdei.c
index b4b9ce9..2d256b2 100644 (file)
--- a/drivers/firmware/arm_sdei.c
+++ b/drivers/firmware/arm_sdei.c
@@ -114,26 +114,7 @@ static int sdei_to_linux_errno(unsigned long sdei_err)
                return -ENOMEM;
        }
 
-       /* Not an error value ... */
-       return sdei_err;
-}
-
-/*
- * If x0 is any of these values, then the call failed, use sdei_to_linux_errno()
- * to translate.
- */
-static int sdei_is_err(struct arm_smccc_res *res)
-{
-       switch (res->a0) {
-       case SDEI_NOT_SUPPORTED:
-       case SDEI_INVALID_PARAMETERS:
-       case SDEI_DENIED:
-       case SDEI_PENDING:
-       case SDEI_OUT_OF_RESOURCE:
-               return true;
-       }
-
-       return false;
+       return 0;
 }
 
 static int invoke_sdei_fn(unsigned long function_id, unsigned long arg0,
@@ -141,14 +122,13 @@ static int invoke_sdei_fn(unsigned long function_id, unsigned long arg0,
                          unsigned long arg3, unsigned long arg4,
                          u64 *result)
 {
-       int err = 0;
+       int err;
        struct arm_smccc_res res;
 
        if (sdei_firmware_call) {
                sdei_firmware_call(function_id, arg0, arg1, arg2, arg3, arg4,
                                   &res);
-               if (sdei_is_err(&res))
-                       err = sdei_to_linux_errno(res.a0);
+               err = sdei_to_linux_errno(res.a0);
        } else {
                /*
                 * !sdei_firmware_call means we failed to probe or called