[PULL,26/92] hw: megasas: return -1 when 'megasas_map_sgl' fails

Commit Message

Paolo Bonzini Sept. 24, 2020, 9:22 a.m. UTC

From: Li Qiang <[e-mail]>

The caller of 'megasas_map_sgl' will only check if the return
is zero or not. If it return 0 it means success, as in the next
patch we will consider 'iov_count=0' is an error, so let's
return -1 to indicate a failure.

Signed-off-by: Li Qiang <[e-mail]>
Message-Id: <[e-mail]>
Signed-off-by: Paolo Bonzini <[e-mail]>
---
 hw/scsi/megasas.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Patch

diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index e90c00823a..4cc709d2c6 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -280,7 +280,7 @@  static int megasas_map_sgl(MegasasState *s, MegasasCmd *cmd, union mfi_sgl *sgl)
     if (iov_count > MEGASAS_MAX_SGE) {
         trace_megasas_iovec_sgl_overflow(cmd->index, iov_count,
                                          MEGASAS_MAX_SGE);
-        return iov_count;
+        return -1;
     }
     pci_dma_sglist_init(&cmd->qsg, PCI_DEVICE(s), iov_count);
     for (i = 0; i < iov_count; i++) {
@@ -310,7 +310,7 @@  static int megasas_map_sgl(MegasasState *s, MegasasCmd *cmd, union mfi_sgl *sgl)
     return 0;
 unmap:
     qemu_sglist_destroy(&cmd->qsg);
-    return iov_count - i;
+    return -1;
 }
 
 /*