media: intel/ipu6: Fix an error handling path in isys_probe()

If an error occurs after a successful alloc_fw_msg_bufs() call, some
resources should be released as already done in the remove function.

Add a new free_fw_msg_bufs() function that releases what has been allocated
by alloc_fw_msg_bufs().

Also use this new function in isys_remove() to avoid some code duplication.

Fixes: f50c4ca0a820 ("media: intel/ipu6: add the main input system driver")
Signed-off-by: Christophe JAILLET <[e-mail]>
Signed-off-by: Sakari Ailus <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/pci/intel/ipu6/ipu6-isys.c

···
 	.resume = isys_resume,
 };
 
+static void free_fw_msg_bufs(struct ipu6_isys *isys)
+{
+	struct device *dev = &isys->adev->auxdev.dev;
+	struct isys_fw_msgs *fwmsg, *safe;
+
+	list_for_each_entry_safe(fwmsg, safe, &isys->framebuflist, head)
+		dma_free_attrs(dev, sizeof(struct isys_fw_msgs), fwmsg,
+			       fwmsg->dma_addr, 0);
+
+	list_for_each_entry_safe(fwmsg, safe, &isys->framebuflist_fw, head)
+		dma_free_attrs(dev, sizeof(struct isys_fw_msgs), fwmsg,
+			       fwmsg->dma_addr, 0);
+}
+
 static int alloc_fw_msg_bufs(struct ipu6_isys *isys, int amount)
 {
 	struct device *dev = &isys->adev->auxdev.dev;
···
 
 	ret = isys_register_devices(isys);
 	if (ret)
-		goto out_remove_pkg_dir_shared_buffer;
+		goto free_fw_msg_bufs;
 
 	ipu6_mmu_hw_cleanup(adev->mmu);
 
 	return 0;
 
+free_fw_msg_bufs:
+	free_fw_msg_bufs(isys);
 out_remove_pkg_dir_shared_buffer:
 	if (!isp->secure_mode)
 		ipu6_cpd_free_pkg_dir(adev);
···
 	struct ipu6_bus_device *adev = auxdev_to_adev(auxdev);
 	struct ipu6_isys *isys = dev_get_drvdata(&auxdev->dev);
 	struct ipu6_device *isp = adev->isp;
-	struct isys_fw_msgs *fwmsg, *safe;
 	unsigned int i;
 
-	list_for_each_entry_safe(fwmsg, safe, &isys->framebuflist, head)
-		dma_free_attrs(&auxdev->dev, sizeof(struct isys_fw_msgs),
-			       fwmsg, fwmsg->dma_addr, 0);
-
-	list_for_each_entry_safe(fwmsg, safe, &isys->framebuflist_fw, head)
-		dma_free_attrs(&auxdev->dev, sizeof(struct isys_fw_msgs),
-			       fwmsg, fwmsg->dma_addr, 0);
+	free_fw_msg_bufs(isys);
 
 	isys_unregister_devices(isys);
 	isys_notifier_cleanup(isys);