[Qemu-devel] [PATCH 2/2] megasas: Error checking for cpu_physical_memory_map()

[hare@suse.de (Hannes Reinecke)]

cpu_physical_memory_map() can fail, so we really should
check for errors here.
Plus a fix for a small casting error.

Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 hw/megasas.c |   23 +++++++++++++++++++----
 1 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/hw/megasas.c b/hw/megasas.c
index 69c5037..e0725de 100644
--- a/hw/megasas.c
+++ b/hw/megasas.c
@@ -264,6 +264,7 @@ megasas_enqueue_frame(MPTState *s, target_phys_addr_t frame)
 {
     struct megasas_cmd_t *cmd = NULL;
     uint8_t frame_size = sizeof(cmd->frame);
+    target_phys_addr_t frame_size_p = frame_size;
 
     cmd = megasas_next_frame(s, frame);
     /* All frames busy */
@@ -271,8 +272,16 @@ megasas_enqueue_frame(MPTState *s, target_phys_addr_t frame)
 	return NULL;
     if (!cmd->pa) {
 	cmd->pa = frame;
-	cmd->frame = cpu_physical_memory_map(frame,
-					     (target_phys_addr_t *)&frame_size, 0);
+	cmd->frame = cpu_physical_memory_map(frame, &frame_size_p, 0);
+	if (frame_size_p != frame_size) {
+	    DPRINTF("failed to map frame %lu\n", (unsigned long)frame);
+	    if (cmd->frame) {
+		cpu_physical_memory_unmap(cmd->frame, frame_size_p, 0, 0);
+		cmd->frame = NULL;
+		cmd->pa = 0;
+	    }
+	    return NULL;
+	}
     }
 
     cmd->frame->header.context = le32_to_cpu(cmd->frame->header.context);
@@ -357,8 +366,13 @@ static int megasas_init_firmware(MPTState *s, struct megasas_cmd_t *cmd)
     DPRINTF("MFI init firmware: xfer len %d pa %lx\n", (int)iq_pl,
 	    (unsigned long)iq_pa);
 #endif
-    initq_size = sizeof(initq);
-    initq = cpu_physical_memory_map(iq_pa, &initq_size, 0); 
+    initq_size = sizeof(*initq);
+    initq = cpu_physical_memory_map(iq_pa, &initq_size, 0);
+    if (initq_size != sizeof(*initq)) {
+	DPRINTF("MFI init firmware: failed to map queue mem\n");
+	s->fw_state = MFI_FWSTATE_FAULT;
+	goto out;
+    }
     s->reply_queue_len = le32_to_cpu(initq->rq_entries);
     pa_lo = le32_to_cpu(initq->rq_addr_lo);
     pa_hi = le32_to_cpu(initq->rq_addr_hi);
@@ -376,6 +390,7 @@ static int megasas_init_firmware(MPTState *s, struct megasas_cmd_t *cmd)
 #endif
     s->reply_queue_index = ldl_phys(s->producer_pa);
     s->fw_state = MFI_FWSTATE_OPERATIONAL;
+out:
     cpu_physical_memory_unmap(initq, initq_size, 0, 0);
     return 0;
 }
-- 
1.6.0.2